2017 new products catalog - analog devices...2017 high performance analog ics new products catalog...

September 2017

High Performance Analog ICs

New Products Catalog

LTC2333-16 Buffered 8-Channel, 16-Bit, 800ksps Differential ±10.24V ADC with 30VP-P Common Mode Range

LTC7001 Fast 150V High Side NMOS Static Switch Driver

LTC5552 3GHz to 20GHz Microwave Mixer with Wideband DC to 6GHz IF

LT3932 36V, 2A Synchronous Step-Down LED Driver

LTC7103 105V, 2.3A Low EMI Synchronous Step-Down Regulator

LTC7801 150V Low IQ, Synchronous Step-Down DC/DC Controller

Contents

Amplifiers

LT®1210X High Temperature 1.0A, 35MHz Current Feedback Amplifier ...............................................................................................................1

LT6203X High Temperature 175°C Dual 100MHz, Rail-to-Rail Input and Output, Ultralow 1.9nV/√Hz Noise, Low Power Op Amp .....................2

Battery Charger

LTC®4091 36V Battery Charger and Power Backup Manager ...............................................................................................................................3

Data Converters

LTC2324-12 Quad, 12-Bit + Sign, 2Msps/Ch Simultaneous Sampling ADC .........................................................................................................4

LTC2324-14 Quad, 14-Bit + Sign, 2Msps/Ch Simultaneous Sampling ADC .........................................................................................................5

LTC2324-16 Quad, 16-Bit, 2Msps/Ch Simultaneous Sampling ADC ....................................................................................................................6

LTC2333-16 Buffered 8-Channel, 16-Bit, 800ksps Differential ±10.24V ADC with 30VP-P Common Mode Range ...............................................7

FET Drivers

LTC7001 Fast 150V High Side NMOS Static Switch Driver ..................................................................................................................................9

LTC7003 Fast 60V Protected High Side NMOS Static Switch Driver ..................................................................................................................10

LTC7004 Fast 60V High Side NMOS Static Switch Driver ..................................................................................................................................11

High Frequency

LTC5552 3GHz to 20GHz Microwave Mixer with Wideband DC to 6GHz IF ........................................................................................................12

Interface

LTC2862A ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceiver with Level 4 IEC ESD ..........................................................................14

LED Driver

LT3932 36V, 2A Synchronous Step-Down LED Driver .......................................................................................................................................15

µModule® Regulators

LTM®4622A Dual Ultrathin 2A or Single 4A Step-Down DC/DC µModule Regulator ..........................................................................................18

Contents

L, LT, LTC, LTM, Linear Technology, Burst Mode, Dust, Dust Networks, Eterna, FilterCAD, LDO+, Linduino, Linear Express, LTPoE++, LTpowerCAD, LTpowerPlanner, LTpowerPlay, LTspice, Manager-on-Chip, OPTI-LOOP, Over-The-Top, PolyPhase, Silent Switcher, SmartMesh, SWITCHER+, TimerBlox, µModule, the Linear logo and the Dust Networks logo are registered trademarks of Analog Devices, Inc. Access Point Mote, Adaptive Power, Anyside, AP Mote, AutoResonant, Bat-Track, BodeCAD, C-Load, ClockWizard, Direct Flux Limit, DirectSense, Easy Drive, EZ204Sync, EZParallelSync, EZSync, FilterView, FracNWizard, isoSPI, LinearView, LTBiCMOS, LTC6951Wizard, LTCMOS, LTP, Micropower SwitcherCAD, Mote-on-Chip, Multimode Dimming, No Latency ∆∑, No Latency Delta-Sigma, No RSENSE, Operational Filter, PanelProtect, ParallelSync, PLLWizard, PowerPath, PowerSOT, PScope, QuikEval, RH DICE Inside, RH MILDICE Inside, SafeSlot, SmartMesh IP, SNEAK-A-BIT, SoftSpan, Stage Shedding, Super Burst, ThinSOT, Triple Mode, True Color PWM, UltraFast, Virtual Remote Sense, Virtual Remote Sensing, VLDO, VManager and VRS are trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.

Switching Regulators—Monolithic

LTC3636/LTC3636-1 Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator ............................................................................20

LTC7103 105V, 2.3A Low EMI Synchronous Step-Down Regulator ..................................................................................................................21

LTC7124 17V, Dual 3.5A Synchronous Step-Down Regulator with Ultralow Quiescent Current ........................................................................22

LTC7150S 20V, 20A Synchronous Step-Down Regulator ..................................................................................................................................23

Switching Regulators—Controllers

LTC7800 Low IQ, 60V, High Frequency Synchronous Step-Down Controller .....................................................................................................24

LTC7801 150V Low IQ, Synchronous Step-Down DC/DC Controller ..................................................................................................................25

LT8390A 60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum ..............................................................................26

Design Notes

DN564 Lower Power Op Amp: Utility Sine Wave

DN565 Simple Power Backup Supply for a 3.3V Rail

1

FEATURES DESCRIPTION

Amplifiers

APPLICATIONS

LT1210X High Temperature 1.0A, 35MHz Current Feedback Amplifier

The LT1210X is a current feedback amplifier with high output current and excellent large-signal characteristics. The combination of high slew rate, 1.0A output drive and ±15V operation, enables the device to deliver significant power at frequencies in the 1MHz to 2MHz range. Short-circuit protection ensures the device’s ruggedness. The LT1210X is stable with large capacitive loads and can easily supply the large currents required by the capacitive loading. A shutdown feature switches the device into a high impedance and low supply current mode, reducing dissipation when the device is not in use. For lower bandwidth applications, the supply current can be reduced with a single external resistor.

The LT1210X is a member of our growing series of high temperature qualified products. For a complete selection of high temperature products, please consult our website www.linear.com.

The LT1210X is available in the thermally enhanced TSSOP16-E package for operation with supplies from ±5V up to ±15V. The LT1210X is also available as dice.

n Extreme High Temperature Operation: –40°C to 175°C n 1.0A Minimum Output Drive Current n 35MHz Bandwidth, AV = 2, RL = 10Ω n 900V/µs Slew Rate, AV = 2, RL = 10Ω n High Input Impedance: 10MΩ n Wide Supply Range: ±5V to ±15V n Shutdown Mode: IS < 200µA n Adjustable Supply Current n Stable with CL = 10,000pF n Available as Dice n Available in 16-Lead Thermally Enhanced TSSOP Package

n Down-Hole Drilling and Instrumentation n Heavy Industrial n Avionics n High Temperature Environments n Cable Drivers n Buffers n Test Equipment Amplifiers n Video Amplifiers n ADSL Drivers

FE PACKAGE16-LEAD PLASTIC TSSOP

1

2

3

4

5

6

7

8

TOP VIEW

16

15

14

13

12

11

10

9

V+

NC

OUT

NC

NC

–IN

NC

V+

V+

NC

V–

COMP

SHUTDOWN

+IN

NC

V+

17

FE PACKAGE 16-LEAD PLASTIC TSSOP

LT1210XFE

Total Harmonic Distortion vs Frequency

FREQUENCY (Hz)1k

TOTA

L HA

RMON

IC D

ISTO

RTIO

N (d

B)

–50

–60

–70

–80

–90

–10010k 100k 1M

1210X TA02

VS = ±15VVOUT = 20VP-PAV = 4

RL = 10Ω

RL = 50Ω

RL = 12.5Ω

Twisted Pair Driver

–

+LT1210X

VIN

4.7µF

4.7µF

100nF

1210X TA01

RT11Ω2.5W T1**

845Ω

31

274Ω

100nF

SD

15V

–15V

** MIDCOM 671-7783 OR EQUIVALENT

RL100Ω2.5W

The LT6203X is a dual low noise, rail-to-rail input and output unity gain stable op amp that features 1.9nV/√Hz noise voltage and draws only 2.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 100MHz gain-bandwidth product, a 25V/µs slew rate, and are optimized for low supply signal conditioning systems.

These amplifiers maintain their performance for supplies from 2.5V to 12.6V and are specified at 3V, 5V and ±5V supplies. Harmonic distortion is less than –80dBc at 1MHz making these amplifiers suitable in low power data acquisition systems.

These devices can be used as plug-in replacements for many op amps to improve input/output range and noise performance.

The LT6203X is a member of our growing series of high temperature qualified products. For a complete selection of high temperature products, please consult our website www.linear.com.

The LT6203X comes in an 8-lead SO package with standard dual op amp pinout. The LT6203X is also available as dice.

n Extreme High Temperature Operation: –40°C to 175°C n Low Noise Voltage: 1.9nV/√Hz (100kHz) n Low Supply Current: 3mA/Amp Max n Gain-Bandwidth Product: 100MHz n Low Distortion: –80dB at 1MHz n Low Offset Voltage: 500µV Max n Wide Supply Range: 2.5V to 12.6V n Inputs and Outputs Swing Rail-to-Rail n Common Mode Rejection Ratio 90dB Typ n Low Noise Current: 1.1pA/√Hz n Output Current: 30mA Min n 8-Lead SO Package n Available as Dice

n Down-Hole Drilling and Instrumentation n Heavy Industrial n Avionics n High Temperature Environments n Low Noise, Low Power Signal Processing n Active Filters n Rail-to-Rail Buffer Amplifiers n Driving A/D Converters n DSL Receivers n Battery-Powered/Battery-Backed Equipment

LT6203X High Temperature 175°C Dual 100MHz, Rail-to-Rail Input and Output, Ultralow 1.9nV/√Hz Noise, Low Power Op Amp

Low Noise Differential Amplifier Frequency Response

FREQUENCY (Hz)50k

RELA

TIVE

DIF

FERE

NTIA

L GA

IN (1

dB/D

IV)

1M 5M

LT6203X TA01b

G = 6dBG = 12dB

G = 0dB

Low Noise Differential Amplifier with Gain Adjust and Common Mode Control

–

+–

+

R1402Ω

R2200Ω

R3100Ω

R4402Ω

R5200Ω

R6100Ω

0dB

6dB

12dB

0dB

6dB

12dB

1/2 LT6203X

1/2 LT6203X

C1270pF

R7, 402Ω

R9402Ω

RA

RB

V+

0.1µFR8

402Ω

C222pF

V+

C35pF

R10, 402Ω

VOUT+

VOUT–

VIN–

VIN+

LT6203X TA01a

RBRA + RB

OUTPUT VCM = V+( )

2


Amplifiers

APPLICATIONS

TOP VIEW

S8 PACKAGE8-LEAD PLASTIC SO

1

2

3

4

8

7

6

5

OUT A

–IN A

+IN A

V–

V+

OUT B

–IN B

+IN B

+

–

+

–

S8 PACKAGE 8-LEAD PLASTIC SO

LT6203XS8

3


Battery Charger

APPLICATIONS

LTC4091 36V Battery Charger and Power Backup Manager

The LTC4091 is a 36V Li-Ion battery charger and power backup manager. The integrated step-down switching regulator charges a battery from a primary power source while providing power to the load. If primary power is lost, the load is seamlessly transitioned to the backup Li-Ion/polymer battery. To protect sensitive downstream loads, the maximum output voltage is 4.45V.

The LTC4091 provides an adaptive output that tracks the battery voltage for high efficiency charging. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge. Also featured is a termination timer and an NTC thermistor input used to monitor battery temperature while charging.

During backup, an internal 75mΩ ideal diode connects the battery to the load. An optional external ideal diode FET driver is available to reduce the voltage drop even further. 4.1V or 4.2V battery charge voltages can be selected.

n Fleet and Asset Tracking n Automotive GPS Data Loggers n Automotive Telematics Systems n Battery Backup Systems

n Seamless Transition Between Primary Power Source and Li-Ion Battery

n 2A High Voltage Step-Down Regulator with Adaptive Output Control

n Internal 75mΩ Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss PowerPath™ When Primary Supply Not Present

n Wide Input Voltage Range: 6V to 36V (60V Abs Max) n 4.45V Max Output Voltage n Full Featured Li-Ion Battery Charger n Pin-Selectable 4.1V and 4.2V Charge Voltage Options n Thermally Enhanced Low Profile (0.75mm) 6mm × 3mm 22-Lead DFN Package

VOUT, IBAT vs VBAT

0 0.6 1.2 1.8 2.4 3 3.6 4.2

BATTERY VOLTAGE (V)

0

0.6

1.2

1.8

2.4

3.0

3.6

4.2

4.8

OUTP

UT, B

ATTE

RY V

OLTA

GE (V

)

4091 TA01b

OUT I = 1A

BAT V

OUT V

BAT I1.0

1.5

2.0

BATTERY CURRENT (A)

0

0.5

VIN

BOOST SW

68µF

3.3µF2AMAX

4.99k

4.7µF

TIMER

LTC4091

GNDPROG

HVOUT

HVPR

OUT

BAT

0.1µF220pF

AUTOMOTIVEINPUT

6V TO 36V

VC

15k

RT

40.2k 52.3k

Li-Ion BATTERY+

LOAD4.45V MAX

4091 TAO1a

6.8µH

0.47µF

22

21

20

19

18

17

16

15

14

13

12

1

2

3

4

5

6

7

8

9

10

11

RUN/SS

VIN

SW

BOOST

HVOUT

TIMER

NC

GND

V4P1

OUT

BAT

TOP VIEW

23GND

DJC PACKAGE22-LEAD (6mm × 3mm) PLASTIC DFN

SYNC

VINGD

RT

VC

NTC

VNTC

HVPR

CHRG

PROG

GATE

BAT

DJC PACKAGE 22-LEAD (6mm × 3mm) PLASTIC DFN

LTC4091EDJCLTC4091IDJC

LTC2324-12 Quad, 12-Bit + Sign, 2Msps/Ch Simultaneous Sampling ADC

The LTC2324-12 is a low noise, high speed quad 12-bit + sign successive approximation register (SAR) ADC with differential inputs and wide input common mode range. Operating from a single 3.3V or 5V supply, the LTC2324-12 has an 8VP-P differential input range, making it ideal for applications which require a wide dynamic range with high common mode rejection. The LTC2324-12 achieves ±0.5LSB INL typical, no missing codes at 12 bits and 78dB SNR.

The LTC2324-12 has an onboard low drift (20ppm/°C max) 2.048V or 4.096V temperature-compensated reference. The LTC2324-12 also has a high speed SPI-compatible serial interface that supports CMOS or LVDS. The fast 2Msps per channel throughput with no latency makes the LTC2324-12 ideally suited for a wide variety of high speed applications. The LTC2324-12 dissipates only 40mW per channel and offers nap and sleep modes to reduce the power consumption to 26μW for further power savings during inactive periods.

n 2Msps/Ch Throughput Rate n Four Simultaneously Sampling Channels n Guaranteed 12-Bit, No Missing Codes n 8VP-P Differential Inputs with Wide Input Common Mode Range

n 78dB SNR (Typ) at fIN = 500kHz n –88dB THD (Typ) at fIN = 500kHz n Guaranteed Operation to 125°C n Single 3.3V or 5V Supply n Low Drift (20ppm/°C Max) 2.048V or 4.096V Internal Reference

n 1.8V to 2.5V I/O Voltages n CMOS or LVDS SPI-Compatible Serial I/O n Power Dissipation 40mW/Ch (Typ) n Small 52-Lead (7mm × 8mm) QFN Package

n High Speed Data Acquisition Systems n Communications n Optical Networking n Multiphase Motor Control

32k Point FFT fSMPL = 2Msps, fIN = 500kHz

SNR = 78.5dBTHD = –87.8dBSINAD = 78.2dBSFDR = 95.9dB

FREQUENCY (MHz)0 0.2 0.4 0.6 0.8 1

–140

–120

–100

–80

–60

–40

–20

0AM

PLIT

UDE

(dBF

S)

232412 TA01b

BIPOLAR UNIPOLAR

ARBITRARY

TRUE DIFFERENTIAL INPUTSNO CONFIGURATION REQUIRED

IN+, IN–

DIFFERENTIAL

0V 0V

VDD VDD

VDD VDD

0V 0V

FOUR SIMULTANEOUSSAMPLING CHANNELS

1µF 10µF 10µF 10µF 10µF

10µF 1µF

AIN1+

AIN1–

AIN2+

AIN2– S/H

AIN3+

AIN3–

AIN4+

AIN4–

12-BIT + SIGNSAR ADC

OVDD

REF

GNDGND

REFOUT1

VDD

1.8V TO 2.5V3.3V OR 5V

CMOS/LVDSSDR/DDR

REFBUFEN

SDO1SDO2SDO3SDO4

CLKOUTSCK

CNV SAMPLECLOCK

REFOUT2 REFOUT3 REFOUT4

LTC2324-12

232412 TA01a

S/H 12-BIT + SIGNSAR ADC



1615 17 18 19

TOP VIEW

53GND

UKG PACKAGE52-LEAD (7mm × 8mm) PLASTIC QFN

20 21 22 23 24 25 26

5152 50 49 48 47 46 45 44 43 42 41

33

34

35

36

37

38

39

40

8

7

6

5

4

3

2

1AIN4–

AIN4+

GND

AIN3–

AIN3+

REFOUT3

GND

REF

REFOUT2

AIN2–

AIN2+

GND

AIN1–

AIN1+

DNC/SDOD–

SDO4/SDOD+

GND

OVDD

DNC/SDOC–

SDO3/SDOC+

CLKOUTEN/CLKOUT–

CLKOUT/CLKOUT+

GND

OVDD

DNC/SDOB–

SDO2/SDOB+

DNC/SDOA–

SDO1/SDOA+

V DD

NC NC GND

NC NC GND

REFO

UT4

V DD

REFB

UFEN

DNC/

SCK–

SCK/

SCK+

V DD

NC NC

GND NC NC V DD

REFO

UT1

SDR/

DDR

CNV

CMOS

/LVD

S

GND

32

31

30

29

28

27

9

10

11

12

13

14

UKG PACKAGE 52-LEAD (7mm × 8mm) PLASTIC QFN

LTC2324CUKG-12LTC2324IUKG-12LTC2324HUKG-12

4


Data Converters

APPLICATIONS

LTC2324-14 Quad, 14-Bit + Sign, 2Msps/Ch Simultaneous Sampling ADC

The LTC2324-14 is a low noise, high speed quad 14-bit + sign successive approximation register (SAR) ADC with differential inputs and wide input common mode range. Operating from a single 3.3V or 5V supply, the LTC2324-14 has an 8VP-P differential input range, making it ideal for applications which require a wide dynamic range with high common mode rejection. The LTC2324-14 achieves ±1LSB INL typical, no missing codes at 14 bits and 81dB SNR.








FREQUENCY (MHz)0 0.2 0.4 0.6 0.8 1

–140

–120

–100

–80

–60

–40

–20

0AM

PLIT

UDE

(dBF

S)

232414 TA01b

BIPOLAR UNIPOLAR

ARBITRARY


IN+, IN–

DIFFERENTIAL

0V 0V

VDD VDD

VDD VDD

0V 0V



10µF 1µF

AIN1+

AIN1–

AIN2+

AIN2– S/H

AIN3+

AIN3–

AIN4+

AIN4–

OVDD

REF

GNDGND

REFOUT1

VDD

1.8V TO 2.5V3.3V OR 5V

CMOS/LVDSSDR/DDR

REFBUFEN

SDO1SDO2SDO3SDO4

CLKOUTSCK

CNV SAMPLECLOCK


LTC2324-14

232414 TA01a

S/H

S/H

S/H

14-BIT+SIGN

SAR ADC

14-BIT+SIGN

SAR ADC

14-BIT+SIGN

SAR ADC

14-BIT+SIGN

SAR ADC

1615 17 18 19

TOP VIEW

53GND


20 21 22 23 24 25 26

5152 50 49 48 47 46 45 44 43 42 41

33

34

35

36

37

38

39

40

8

7

6

5

4

3

2

1AIN4–

AIN4+

GND

AIN3–

AIN3+

REFOUT3

GND

REF

REFOUT2

AIN2–

AIN2+

GND

AIN1–

AIN1+

DNC/SDOD–

SDO4/SDOD+

GND

OVDD

DNC/SDOC–

SDO3/SDOC+

CLKOUTEN/CLKOUT–

CLKOUT/CLKOUT+

GND

OVDD

DNC/SDOB–

SDO2/SDOB+

DNC/SDOA–

SDO1/SDOA+

V DD

NC NC GND

NC NC GND

REFO

UT4

V DD

REFB

UFEN

DNC/

SCK–

SCK/

SCK+

V DD

NC NC

GND NC NC V DD

REFO

UT1

SDR/

DDR

CNV

CMOS

/LVD

S

GND

32

31

30

29

28

27

9

10

11

12

13

14



5


Data Converters

APPLICATIONS

6


Data Converters

APPLICATIONS

LTC2324-16 Quad, 16-Bit, 2Msps/Ch Simultaneous Sampling ADC

The LTC2324-16 is a low noise, high speed quad 16-bit successive approximation register (SAR) ADC with differential inputs and wide input common mode range. Operating from a single 3.3V or 5V supply, the LTC2324-16 has an 8VP-P differential input range, making it ideal for applications which require a wide dynamic range with high common mode rejection. The LTC2324-16 achieves ±2LSB INL typical, no missing codes at 16 bits and 82dB SNR.








FREQUENCY (MHz)0 0.2 0.4 0.6 0.8 1

–140

–120

–100

–80

–60

–40

–20

0AM

PLIT

UDE

(dBF

S)IN

232416 TA01b

BIPOLAR UNIPOLAR

ARBITRARY


IN+, IN–

DIFFERENTIAL

0V 0V

VDD VDD

VDD VDD

0V 0V



10µF 1µF

AIN1+

AIN1–

AIN2+

AIN2– S/H

AIN3+

AIN3–

AIN4+

AIN4–

16-BITSAR ADC

OVDD

REF

GNDGND

REFOUT1

VDD

1.8V TO 2.5V3.3V OR 5V

CMOS/LVDSSDR/DDR

REFBUFEN

SDO1SDO2SDO3SDO4

CLKOUTSCK

CNV SAMPLECLOCK


LTC2324-16

232416 TA01a

S/H 16-BITSAR ADC

S/H 16-BITSAR ADC

S/H 16-BITSAR ADC

1615 17 18 19

TOP VIEW

53GND


20 21 22 23 24 25 26

5152 50 49 48 47 46 45 44 43 42 41

33

34

35

36

37

38

39

40

8

7

6

5

4

3

2

1AIN4–

AIN4+

GND

AIN3–

AIN3+

REFOUT3

GND

REF

REFOUT2

AIN2–

AIN2+

GND

AIN1–

AIN1+

DNC/SDOD–

SDO4/SDOD+

GND

OVDD

DNC/SDOC–

SDO3/SDOC+

CLKOUTEN/CLKOUT–

CLKOUT/CLKOUT+

GND

OVDD

DNC/SDOB–

SDO2/SDOB+

DNC/SDOA–

SDO1/SDOA+

V DD

NC NC GND

NC NC GND

REFO

UT4

V DD

REFB

UFEN

DNC/

SCK–

SCK/

SCK+

V DD

NC NC

GND NC NC V DD

REFO

UT1

SDR/

DDR

CNV

CMOS

/LVD

S

GND

32

31

30

29

28

27

9

10

11

12

13

14



7


Data Converters

APPLICATIONS

LTC2333-16 Buffered 8-Channel, 16-Bit, 800ksps Differential ±10.24V ADC with 30VP-P Common Mode Range

The LTC2333-16 is a 16-bit, low noise 8-channel multiplexed successive approximation register (SAR) ADC with buffered differential, wide common mode range picoamp inputs. Operating from a 5V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, this SoftSpan ADC can be configured on a conversion-by-conversion basis to accept ±10.24V, 0V to 10.24V, ±5.12V or 0V to 5.12V signals on any channel. Alternately, the ADC may be programmed to cycle through a sequence of channels and ranges without further user intervention.

The integrated picoamp-input analog buffers, wide input common mode range and 128dB CMRR of the LTC2333-16 allow the ADC to directly digitize a variety of signals using minimal board space and power. This input signal flexibility, combined with ±1LSB INL, no missing codes at 16 bits, and 94.2dB SNR, makes the LTC2333-16 an ideal choice for many high voltage applications requiring wide dynamic range.

The LTC2333-16 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces.

n Eight Buffered Multiplexed Channels n 800ksps Throughput n 500pA/12nA Maximum Input Leakage at 85°C/125°C n ±1LSB INL (Maximum ±10.24V Range) n Guaranteed 16-Bit, No Missing Codes n Differential, Wide Common Mode Range Inputs n 8-Channel Multiplexer with SoftSpan™ Input Ranges:

n ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V n ±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V

n 94.2dB Single-Conversion SNR (Typical) n −110dB THD (Typical) at fIN = 2kHz n 128dB CMRR, –125dB Active Crosstalk (Typical) n 420ns Step Response (Full-Scale, 0.005% Settling) n Rail-to-Rail Input Overdrive Tolerance n Programmable Sequencer with No Latency Control n Integrated Reference and Buffer (4.096V) n SPI CMOS (1.8V to 5V) and LVDS Serial I/O n 268mW Power Dissipation (Typical) n 48-Lead (7mm × 7mm) LQFP Package

n Direct Sensor Measurement n Programmable Logic Controllers n Industrial Process Control n Test and Measurement

Protected by U.S. Patents, including 7705765, 7961132, 8319673, 9197235.

Integral Nonlinearity vs Output Code and Channel

±10.24V RANGETRUE BIPOLAR DRIVE (IN– = 0V)

ALL CHANNELS

OUTPUT CODE–32768 –16384 0 16384 32768

–1.00

–0.75

–0.50

–0.25

0

0.25

0.50

0.75

1.00

INL

ERRO

R (L

SB)

233316 TA01b

123456789

101112

363534333231302928272625

IN6–

IN6+

IN5–

IN5+

IN4–

IN4+

IN3–

IN3+

IN2–

IN2+

IN1–

IN1+

13 14 15 16 17 18 19 20 21 22 23 24

IN0–

IN0+

GND

V CC

V EE

GND

REFI

NGN

DRE

FBUF PD

LVDS

/CMOS CN

V

48 47 46 45 44 43 42 41 40 39 38 37

IN7+

IN7–

GND

V EE

GND

V DD

V DD

GND

V DDL

BYP

CS BUSY

SDI

SCKO+/SCKOOVDDGNDSCKI–/SCKISCKI+

SDI–

SDI+

GND

GNDSDO–

SDO+

SCKO–/SDO

TOP VIEW

LX PACKAGE48-LEAD (7mm × 7mm) PLASTIC LQFP

LX PACKAGE 48-LEAD (7mm × 7mm) PLASTIC LQFP

LTC2333CLX-16LTC2333ILX-16LTC2333HLX-16

0.1µF2.2µF0.1µF0.1µF1.8V TO 5V5V15V

–15V

SAMPLECLOCK

233316 TA01a

MUX

VCC VDD VDDLBYP OVDD

DIFFERENTIAL INPUTS IN+/IN– WITHWIDE INPUT COMMON MODE RANGE

+10V

0V

–10V

TRUE BIPOLAR

+10V

0V

–10V

ARBITRARY

+10V

0V

–10V

UNIPOLAR

SDOSCKOSCKI

SDICS

BUSYCNV

• • •

LVDS/CMOSPD

IN0+

IN0–

IN7+

IN7–

16-BITSAMPLING

ADC

CMOS OR LVDSI/O INTERFACE

0.1µF

REFIN

47µF0.1µF

GNDREFBUFVEE

LTC2333-16+5V

0V

–5V

FULLYDIFFERENTIAL

BUFFERS

EIGHT BUFFEREDCHANNELS

SPI CMOS/Serial LVDS

LTC2358-18S/H

S/H

S/H

S/H

S/H

18-BITSAR ADC

S/H

S/H

S/H

MU

X

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FULLYDIFFERENTIAL

+10V

0V

–10V

TRUE BIPOLAR

+10V

0V

–10V

ARBITRARY

+10V

0V

–10V

UNIPOLAR

+5V

0V

–5V

Info & Free Samples

, LT, LTC, LTM, Linear Technology, the Linear logo, and µModule are registered trademarks and SoftSpan is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners.

www.linear.com/product/23581-800-4-LINEAR

Features

• 200ksps per Channel Throughput• Eight Buffered Simultaneous Sampling

Channels• Differential, 30Vp-p Common Mode

Range Inputs• Per-Channel SoftSpan™ Input Ranges: • ±10.24V, 0V to 10.24V, ±5.12V,

0V to 5.12V • ±12.5V, 0V to 12.5V, ±6.25V,

0V to 6.25V• 96.4dB Single-Conversion SNR (Typical)• 48-Lead (7mm x 7mm) LQFP Package

One of the biggest challenges designers face after selecting an ADC is finding space for all of the signal conditioning circuitry required to drive the inputs. The LTC®2358 alleviates this problem, integrating front end buffers that accept a wide 30Vp-p common mode range, providing a compact solution in a 7mm x 7mm footprint. Picoamp inputs and 128dB CMRR enable the ADC to connect directly to a wide range of sensors without compromising measurement accuracy, thus saving significant board space, power consumption and component cost.

OUTPUT CODE–131072 –65536 0 65536 131072

–2.0

–1.5

–1.0

–0.5

0

0.5

1.0

1.5

2.0

INL

ERRO

R (L

SB)

±10.24V RANGE

ALL CHANNELSTRUE BIPOLAR DRIVE (IN-= 0V)

video.linear.com/7641

Integral Nonlinearity vsOutput Code and Channel

Eliminate up to 88 Analog Components with a Single Part

18-Bit Octal SAR ADCwith Integrated Buffers

Find your local sales office: www.linear.com/contact


LTC2358-18S/H

S/H

S/H

S/H

S/H

18-BITSAR ADC

S/H

S/H

S/HMUX

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FULLYDIFFERENTIAL

+10V

0V

–10V

TRUE BIPOLAR

+10V

0V

–10V

ARBITRARY

+10V

0V

–10V

UNIPOLAR

+5V

0V

–5V

Info & Free Samples



Features




0V to 5.12V • ±12.5V, 0V to 12.5V, ±6.25V,



OUTPUT CODE–131072–65536065536131072

–2.0

–1.5

–1.0

–0.5

0

0.5

1.0

1.5

2.0

INL ERROR (LSB)

±10.24V RANGE







9


FET Drivers

APPLICATIONS


The LTC7001 is a fast high side N-channel MOSFET gate driver that operates from input voltages up to 135V. It contains an internal charge pump that fully enhances an external N-channel MOSFET switch, allowing it to remain on indefinitely.

Its powerful driver can easily drive large gate capacitances with very short transition times, making it well suited for both high frequency switching applications or static switch applications that require a fast turn-on and/or turn-off time.

The LTC7001 is available in the thermally enhanced 10-lead MSOP package.

n Wide Operating VIN: Up to 135V (150V Abs Max) n 1Ω Pull-Down, 2.2Ω Pull-Up for Fast Turn-On and Turn-Off Times with 35ns Propagation Delays

n Internal Charge Pump for 100% Duty Cycle n Adjustable Turn-On Slew Rate n Gate Driver Supply from 3.5V to 15V n Adjustable VIN Overvoltage Lockout n Adjustable Driver Supply VCC Undervoltage Lockout n CMOS Compatible Input n Thermally Enhanced, High Voltage Capable 10-Lead MSOP Package

High Voltage, High Side Switch with 100% Duty Cycle

7001 TA01a

LOAD0V TO 135VOVLO

GND

INPONOFF BST

TGUP

TGDN

TS

LTC7001

VCCUV

VCC

VIN0V TO 135V

VCC3.5V TO 15V

0.1µF

LTC7001 Driving a 1nF Capacitive Load

10ns/DIV

VINP2V/DIV

VTG-TS5V/DIV

7001 TA01b

n Static Switch Driver n Load and Supply Switch Driver n Electronic Valve Driver n High Frequency High Side Gate Driver

12345

VCCVCCUV

GNDINP

OVLO

109876

NCBSTTSTGUPTGDN

TOP VIEW

MSE PACKAGE10-LEAD PLASTIC MSOP

11GND

MSE PACKAGE 10-LEAD PLASTIC MSOP

LTC7001EMSELTC7001IMSELTC7001HMSE

LTC7001MPMSE


LTC2358-18S/H

S/H

S/H

S/H

S/H

18-BITSAR ADC

S/H

S/H

S/H

MU

X

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FILTER

FULLYDIFFERENTIAL

+10V

0V

–10V

TRUE BIPOLAR

+10V

0V

–10V

ARBITRARY

+10V

0V

–10V

UNIPOLAR

+5V

0V

–5V

Info & Free Samples



Features




0V to 5.12V • ±12.5V, 0V to 12.5V, ±6.25V,



OUTPUT CODE–131072 –65536 0 65536 131072

–2.0

–1.5

–1.0

–0.5

0

0.5

1.0

1.5

2.0

INL

ERRO

R (L

SB)

±10.24V RANGE







10


FET Drivers

APPLICATIONS

LTC7003 Fast 60V Protected High Side NMOS Static Switch Driver



When an internal comparator senses that the switch current has exceeded a preset level, a fault flag is asserted and the switch is turned off after a period of time set by an external timing capacitor. After a cooldown period, the LTC7003 automatically retries.


VIN = 60V

20ns/DIV

VINP2V/DIV

VLOAD20V/DIV

7003 TA01b

Turn-On Transient Waveform

n Wide Operating VIN: 3.5V to 60V n 1Ω Pull-Down, 2.2Ω Pull-Up for Fast Turn-On and Turn-Off Times with 35ns Propagation Delays

n Internal Charge Pump for 100% Duty Cycle n Short-Circuit Protected n Adjustable Current Trip Threshold n Current Monitor Output n Automatic Restart Timer n Open-Drain Fault Flag n Adjustable Turn-On Slew Rate n Gate Driver Supply from 3.5V to 15V n Adjustable VIN Undervoltage and Overvoltage Lockouts n Adjustable Driver Supply VCC Undervoltage Lockout n Low Shutdown Current: 1µA n CMOS Compatible Input n Thermally Enhanced, High Voltage Capable 16-Lead MSOP Package

High Side Switch with 100% Duty Cycle and Overcurrent Protection

1µF

0.1µF

100k

1nF

0.007Ω

VIN3.5V TO 60V

LOAD3.5V TO 60V3A CONTINOUS MAX

7003 TA01a

VIN

VCC

FAULTTIMER

INP

SNS+

SNS–

BST

TGUPTGDN

TS

LTC7003

VCCUVOVLO GND

RUN

PINS NOT USED IN THIS CIRCUIT: IMON ISET

OFF ON


12345678

RUNVINVCC

VCCUVFAULTTIMER

INPOVLO

17GND

161514131211109

SNS+

SNS–

BSTTSTGUPTGDNIMONISET

TOP VIEW


(NOTE 6)



LTC7003MPMSE

11


FET Drivers

APPLICATIONS





n Wide Operating VIN: Up to 60V n 1Ω Pull-Down, 2.2Ω Pull-Up for Fast Turn-On and Turn-Off Times with 35ns Propagation Delays

n Internal Charge Pump for 100% Duty Cycle n Adjustable Turn-On Slew Rate n Gate Driver Supply from 3.5V to 15V n Adjustable VIN Overvoltage Lockout n Adjustable Driver Supply VCC Undervoltage Lockout n CMOS Compatible Input n Thermally Enhanced, High Voltage Capable 10-Lead MSOP Package


High Voltage, High Side Switch with 100% Duty Cycle

7004 TA01a

LOAD0V TO 60VOVLO

GND

INPONOFF BST

TGUP

TGDN

TS

LTC7004

VCCUV

VCC

VIN0V TO 60V

VCC3.5V TO 15V

0.1µF

LTC7004 Driving a 1nF Capacitive Load

10ns/DIV

VINP2V/DIV

VTG-TS5V/DIV

7004 TA01b

12345

VCCVCCUV

GNDINP

OVLO

109876

NCBSTTSTGUPTGDN

TOP VIEW


11GND



LTC7004MPMSE

12


High Frequency

APPLICATIONS

LTC5552 3GHz to 20GHz Microwave Mixer with Wideband DC to 6GHz IF

The LTC5552 is a high performance, microwave double balanced passive mixer that can be used for frequency upconversion or downconversion. The device is similar to the LTC5553, but with a broadband, differential DC to 6GHz IF port. The LTC5552 is recommended for applications where the IF frequency range extends below 500MHz. For applications where the IF frequency is always above 500MHz, the LTC5553 is recommended, since it includes an integrated IF balun.

The mixer and integrated RF balun are optimized to cover the 3GHz to 20GHz RF frequency range. The integrated LO amplifier is optimized for the 1GHz to 20GHz frequency range, requiring only 0dBm drive.

The part delivers high IIP3 and P1dB, low LO leakage and high integration in a small package.

Electrostatic Sensitive DeviceObserve Handling Precautions ESD Sensitivity: HBM = Class 0 on Pin 11 Class 1C All Other Pins CDM = 500V All Pins

n Integrated LO Buffer: 0dBm LO Drive n 50Ω Wideband Matched RF and LO Ports n Wide IF Bandwidth: DC to 6GHz n Upconversion or Downconversion n High IIP3:

n +22.5dBm at 10GHz n +18.3dBm at 17GHz

n +14.6dBm Input P1dB at 10GHz n 8dB Conversion Loss at 10GHz n 3.3V/132mA Supply n Fast Turn ON/OFF for TDD Operation n 3mm × 2mm, 12-Lead QFN Package

n 5G Broadband Wireless Access n Microwave Transceivers n Wireless Backhaul n Point-to-Point Microwave n Phased-Array Antennas n C, X and Ku Band RADAR n Test Equipment n Satellite Modems

DUPLEXER

LNA

PA

LTC5552RX

IFOUT

TXIFIN

RXLO

TXLO

LO

RF IF

LTC5552

LORF IF

5552 TA01a

Conversion Loss and IIP3 vs RF Frequency (Low Side LO, IF = 240MHz)

IIP3

CONVERSION LOSS

DOWNMIXINGUPMIXING

RF FREQUENCY (GHz)3 5 7 9 11 13 15 17 19 21

7

9

11

13

15

17

19

21

23

25

CONV

ERSI

ON L

OSS

(dB)

, IIP

3 (d

Bm)

5552 TA01b

VCC

GND

EN

9

8

7

GND

IF+

IF–

1

2

3

13GND

GND RF

GND

4 5 6

GND

LO GND

12 11 10

TOP VIEW

UDB PACKAGE12-LEAD (3mm × 2mm) PLASTIC QFN

UDB PACKAGE 12-LEAD (3mm × 2mm) PLASTIC QFN

LTC5552IUDB

Protected by U.S. patents, including 9312815.

Info & Online Store Features

, LT, LTC, LTM, Linear Technology, the Linear logo, and µModule are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.

www.linear.com/product/LTC55961-800-4-LINEAR

• RF Input 50Ω-Matched from 100MHz to 40GHz

• 35dB Log-Linear Dynamic Range to ±1dB Accuracy

• –32.6dBm Minimum Detectable Signal Sensitivity

Efficiency vs Load Current

0.1 1 10 100

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

RF FREQUENCY (GHZ)

OUTP

UT V

OLTA

GE (V

)

0dBm–5dBm–10dBm–15dBm–20dBm–25dBm–30dBm–35dBm

The LTC5596 provides accurate RF power measurement covering a wide frequency range from 100MHz to 40GHz, over temperature variations and wide signal levels–regardless of signal type or modulation waveforms, including OFDM, high order QAM, multi-carrier and radar signals.

Measure RMS Power to

40GHzImprove Measurement Accuracy and Detection Sensitivity

2mm x 2mmfootprint


Info & Online Store Features


www.linear.com/product/LTC55961-800-4-LINEAR

• RF Input 50Ω-Matched from 100MHz to 40GHz

• 35dB Log-Linear Dynamic Range to ±1dB Accuracy

• –32.6dBm Minimum Detectable Signal Sensitivity


0.1 1 10 100

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

RF FREQUENCY (GHZ)

OUTP

UT V

OLTA

GE (V

)

0dBm–5dBm–10dBm–15dBm–20dBm–25dBm–30dBm–35dBm

The LTC5596 provides accurate RF power measurement covering a wide frequency range from 100MHz to 40GHz, over temperature variations and wide signal levels–regardless of signal type or modulation waveforms, including OFDM, high order QAM, multi-carrier and radar signals.

Measure RMS Power to

40GHzImprove Measurement Accuracy and Detection Sensitivity

2mm x 2mmfootprint


14


Interface

APPLICATIONS

LTC2862A ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceiver with Level 4 IEC ESD

n Protected from Overvoltage Line Faults to ±60V n 3V to 5.5V Supply Voltage n 20Mbps or Low EMI 250kbps Data Rate n ±40kV HBM ESD Interface Pins, ±15kV Other Pins n Enhanced Receiver and Failsafe Noise Immunity n IEC Level 4 ESD and EFT on Interface Pins n Extended Common Mode Range: ±25V n Guaranteed Failsafe Receiver Operation n High Input Impedance Supports 224 Nodes n MP-Grade Option Available (–55°C to 125°C) n Fully Balanced Differential Receiver Thresholds for Low Duty Cycle Distortion

n Current Limited Drivers and Thermal Shutdown n Compliant with TIA/EIA-485-A n Pin Compatible with LTC2862 and LT1785 n Available in DFN and Leaded Packages

n Supervisory Control and Data Acquisition (SCADA) n Industrial Control and Instrumentation Networks n Automotive and Transportation Electronics n Building Automation, Security Systems and HVAC n Medical Equipment n Lighting and Sound System Control

PART NUMBER DUPLEX ENABLESMAX DATA RATE (bps)

LTC2862A-1 HALF YES 20M

LTC2862A-2 HALF YES 250k

The LTC2862A is a low power, 20Mbps or 250kbps RS485/RS422 transceiver operating on 3V to 5.5V supplies with ±60V overvoltage fault protection on the interface pins during all modes of operation, including power-down. Improvements were made to the LTC2862 for greater robustness and signal integrity: ±40kV HBM and Level 4 IEC ESD protection on the interface pins; increased resistance to electrical overstress; increased receiver noise immunity; additional receiver noise filtering on the LTC2862A-2; and an improved failsafe function optimized for high speed in the LTC2862A-1 and noise rejection in the LTC2862A-2. Low EMI slew rate limited data transmission is available in the 250kbps LTC2862A-2 option, while the LTC2862A-1 operates to 20Mbps.

Extended ±25V input common mode range and full failsafe operation improve data communication reliability in electrically noisy environments and in the presence of large ground loop voltages.

Product Selection Guide

RS485 Link with Large Ground Loop Voltage

GND1 GND22862A TA01a

RO1RE1DE1

DI1

VCC1

LTC2862A LTC2862A

VCC2

RO2RE2DE2

DI2D D

R R

V GROUND LOOP≤25V PEAK

LTC2862A-1 Receiving 10Mbps ±200mV Differential Signal with 1MHz ±25V Common Mode Sweep

A,B50V/DIV

A–B0.5V/DIV

100ns/DIV 2862A TA01b

RO5V/DIV

RO

A,B

A–B

1

2

3

4

8

7

6

5

TOP VIEW

VCC

B

A

GND

RO

RE

DE

DI

S8 PACKAGE8-LEAD (150mil) PLASTIC SO

TJMAX = 150°C, θJA = 120°C/W, θJC = 39°C/W

S8 PACKAGE 8-LEAD (150mil) PLASTIC SO

LTC2862ACS8-1LTC2862AIS8-1LTC2862AHS8-1

LTC2862AMPS8-1LTC2862ACS8-2LTC2862AIS8-2LTC2862AHS8-2

LTC2862AMPS8-2

TOP VIEW

DD PACKAGE8-LEAD (3mm × 3mm) PLASTIC DFN

EXPOSED PAD (PIN 9) CONNECT TO PCB GNDTJMAX = 150°C, θJA = 43°C/W, θJC = 5.5°C/W

5

6

7

8

9

4

3

2

1RO

RE

DE

DI

VCC

B

A

GND

DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN

LTC2862ACDD-1LTC2862AIDD-1LTC2862AHDD-1LTC2862ACDD-2LTC2862AIDD-2LTC2862AHDD-2

15


LED Driver

APPLICATIONS

LT3932 36V, 2A Synchronous Step-Down LED Driver

The LT3932 is a monolithic, synchronous, step-down DC/DC converter that utilizes fixed frequency, peak current control and provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. An output voltage limit can be set with a resistor divider to the FB pin.

The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or by an external clock at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 100% to 125% to reduce EMI. The LT3932 also includes a driver for an external, high side PMOS for PWM dimming and an internal PWM signal generator for analog control of PWM dimming when an external signal is not available.

Additional features include an LED current monitor, an accurate EN/UVLO pin threshold, open-drain fault reporting for open-circuit and short-circuit load conditions, and thermal shutdown.

n ±1.5% LED Current Regulation n ±1.2% Output Voltage Regulation n 5000:1 PWM Dimming at 100Hz n 128:1 Internal PWM Dimming n Spread Spectrum Frequency Modulation n Silent Switcher® Architecture for Low EMI n 3.6V to 36V Input Voltage Range n 0V to 36V LED String Voltage n 2A, 36V Internal Switches n 200kHz to 2MHz with SYNC Function n 99.9% Maximum Duty Cycle n Analog or Duty Cycle LED Current Control n Open/Short LED Protection and Fault Indication n Accurate LED Current Sense with Monitor Output n Programmable UVLO n Thermally Enhanced 28-Lead (4mm × 5mm) QFN

n Automotive Lighting n Industrial and General Purpose Lighting

2A LED Driver with Internal PWM Dimming

30.1k

274k

45.3k

110k

10k

50mΩ

100nF

2.2µF

2.2µF

100nF 10nF

3932 TA01a

2x1µF

8.2µH

28.7k162k

100k

100k100k

10µF

COUT100µF

VIN

EN/UVLO

VREF

CTRLPWM

SYNC/SPRD

INTVCC

SS RT RP VC

ISP

ISN

FB

VOUT

SW

BST

LT3932

PWMTG

VIN12V

VOUT 9V 1A

2MHz

ISMONFAULTFAULT ISMON

7.8kHz

GND

Internal PWM Dimming

PWM = 1.078V(8% PWM DUTY RATIO)

2µs/DIV

SW20V/DIV

PWMTG10V/DIV

IL1A/DIV

ILED1A/DIV

3932 G35

9 10

TOP VIEW

UFD PACKAGE28-LEAD (4mm × 5mm) PLASTIC QFN

11 12 13

28 27 26 25 24

14

23

6

5

4

3

2

1VREF

SS

VC

FB

ISP

ISN

ISMON

FAULT

GND

VIN

VIN

SW

SW

VIN

VIN

GND

CTRL

EN/U

VLO

V IN

INTV

CC

BST

GND

RP RT

SYNC

/SPR

D

PWM

PWM

TG

V OUT

7

17

18

19

20

21

22

16

8 15

29GND

UFD PACKAGE 28-LEAD (4mm × 5mm) PLASTIC QFN

LT3932EUFDLT3932IUFDLT3932HUFD

Protected by U.S. Patents including 7199560, 7321203, 9596728, 9642200 and other patents pending.

CISPR 22 Class B Compliant, Silent Switcher® Step-Down µModule® Regulators

Low EMI µModule RegulatorsEN55022 Class B Certified CISPR 22 Class B Compliant, or CISPR 25 Class 5 Compliant*

n LTM®8073: 60VIN, 3A Continuous, 5A Peak n LTM8053: 40VIN, 3.5A Continuous, 6A Peak

15mm

10mm

LTM8053 Typical Application n Requires Only Four External

Components

DC1934A: LTM8053 Demo Board n Solution Size Is Approximately 150mm2

CISPR 22 Class B Emissions n DC1934A (LTM8053 Demo Board) n No EMI Filter

Standard Content Notes

EN55022 European Standard for EMC for Information Technology Equipment Certified by TUV Rheinland (see EMC Test Reports**)CISPR 22 International Standard for EMC for Information Technology Equipment Verified by Linear TechnologyCISPR 25 International Standard for EMC for Automotive Products Verified by Linear Technology

** EMC Test Reports (EN55022 Class B): http://www.linear.com/designtools/packaging/umodule.php

5VOUT, 3.5A Load14VIN, fSW = 1MHz

Class B Limit

FREQUENCY (MHz)0 200 400 600 800 1000

–5

5

15

25

35

45

55AM

PLIT

UDE

(dBu

V/m

)

4.7µF

100µF60.4k41.2k1MHz

LTM8053

VOUT

AUXBIAS

VOUT5V3.5A

VINVIN7V TO 40V

FBGND

RUN

SYNC

RT

Photo: Medical Imaging Systems

*

L, LT, LTC, LTM, Linear Technology, the Linear logo, Silent Switcher and µModule are registered trademarks of Analog Devices, Inc.. All other trademarks are the property of their respective owners.

Low EMI µModule RegulatorsCISPR 25 Class 5 Compliant, Silent Switcher Step-Down Regulator

LTM8003: 40VIN, 3.5A Continuous/6A Peak with: n FMEA Compliant Pinout (LTM8003-3.3) Output Stays at or Below

Regulation Voltage During Adjacent Pin Short or if a Pin Is Left Floating n 150°C Operation (H-Grade) n Low Quiescent Current: 25µA (Typ)

LTM8003 Typical Application n 3.3VOUT from 5VIN to 40VIN

Step-Down Converter

FMEA Compliant Pinout n 6.25mm × 9mm × 3.32mm BGA Package

CISPR 25 Class 5 Peak Radiated n DC2416A (LTM8003 Demo Board) n VOUT = 5V, Spread Spectrum Enabled

Part Number

Input Voltage (V) Output Voltage (V)

IOUT (A)Clock Sync

Range (MHz)Parallelable Output

(Total IOUT)*Package

Dimensions (mm) PackageMin Max Min Max

CISPR 22 Class B Compliant, Step-Down µModule Regulators

LTM8053 3.4 40 0.97 15 3.5 (Continuous) 6 (Peak) 0.2 to 3 ×2 (7A) 6.25 × 9 × 3.32 BGA

LTM8073 3.6 60 0.8 15 3 (Continuous) 5 (Peak) 0.2 to 3 ×2 (6A) 6.25 × 9 × 3.32 BGA

EN55022 Class B Certified, Step-Down µModule Regulators

LTM8020 4 36 1.2 5 0.2 – – 6.25 × 6.25 × 2.32 LGA LTM8021 3 36 0.8 5 0.5 – – 6.25 × 11.25 × 2.82 LGALTM8031 3.6 36 0.8 10 1 0.25 to 2.0 ×2 (2A) 9 × 15 × 2.82 LGA

LTM8032 3.6 36 0.8 10 2 0.25 to 2.0 ×2 (4A) 9 × 15 × 2.82 9 × 15 × 3.42

LGA BGA

LTM8033 3.6 36 0.8 24 3 0.25 to 2.0 ×2 (6A) 11.25 × 15 × 4.32 11.25 × 15 × 4.92

LGA BGA

LTM4623 4* 20 0.6 5.5 3 0.56 to 4 ×2 (6A) 6.25 × 6.25 × 1.82 6.25 × 6.25 × 2.42

LGA BGA

LTM4624 4* 14 0.6 5.5 4 - - 6.25 × 6.25 × 5.01 BGALTM4612 5 36 3.3 15 5 0.18 to 1.3 ×2 (10A) 15 × 15 × 2.82 LGA

LTM4606 4.5 28 0.6 5 6 0.7 to 1.1 ×2 (12A) 15 × 15 × 2.82 15 × 15 × 3.42

LGA BGA

LTM4613 5 36 3.3 15 8 0.18 to 1.3 ×2 (16A) 15 × 15 × 4.32 15 × 15 × 4.92

LGA BGA

CISPR 25 Class 5 Compliant, Step-Down µModule Regulator

LTM8003 3.4 40 0.97 18 3.5 (Continuous) 6 (Peak) 0.2 to 3 – 6.25 × 9 × 3.32 BGA

*Number of devices in parallel tested and verified by Linear Technology.

fSW = 2MHzIOUT = 3.5A

FREQUENCY (MHz)0 200 400 600 800 1000

–10

0

10

20

30

40

50

AMPL

ITUD

E (d

BuV/

m)

4.7µF

100µF49.9k850kHz

LTM8003-3.3

VOUT

BIAS

VOUT3.3V4A

VINVIN5V TO 40V

GND

RUN

SYNC

RT

0317A

www.linear.com/umodule_lowemi n 1-800-4-LINEAR

CISPR 22 Class B Compliant, Silent Switcher® Step-Down µModule® Regulators

Low EMI µModule RegulatorsEN55022 Class B Certified CISPR 22 Class B Compliant, or CISPR 25 Class 5 Compliant*

n LTM®8073: 60VIN, 3A Continuous, 5A Peak n LTM8053: 40VIN, 3.5A Continuous, 6A Peak

15mm

10mm

LTM8053 Typical Application n Requires Only Four External

Components

DC1934A: LTM8053 Demo Board n Solution Size Is Approximately 150mm2

CISPR 22 Class B Emissions n DC1934A (LTM8053 Demo Board) n No EMI Filter

Standard Content Notes

EN55022 European Standard for EMC for Information Technology Equipment Certified by TUV Rheinland (see EMC Test Reports**)CISPR 22 International Standard for EMC for Information Technology Equipment Verified by Linear TechnologyCISPR 25 International Standard for EMC for Automotive Products Verified by Linear Technology

** EMC Test Reports (EN55022 Class B): http://www.linear.com/designtools/packaging/umodule.php

5VOUT, 3.5A Load14VIN, fSW = 1MHz

Class B Limit

FREQUENCY (MHz)0 200 400 600 800 1000

–5

5

15

25

35

45

55

AMPL

ITUD

E (d

BuV/

m)

4.7µF

100µF60.4k41.2k1MHz

LTM8053

VOUT

AUXBIAS

VOUT5V3.5A

VINVIN7V TO 40V

FBGND

RUN

SYNC

RT

Photo: Medical Imaging Systems

*

L, LT, LTC, LTM, Linear Technology, the Linear logo, Silent Switcher and µModule are registered trademarks of Analog Devices, Inc.. All other trademarks are the property of their respective owners.

Low EMI µModule RegulatorsCISPR 25 Class 5 Compliant, Silent Switcher Step-Down Regulator

LTM8003: 40VIN, 3.5A Continuous/6A Peak with: n FMEA Compliant Pinout (LTM8003-3.3) Output Stays at or Below

Regulation Voltage During Adjacent Pin Short or if a Pin Is Left Floating n 150°C Operation (H-Grade) n Low Quiescent Current: 25µA (Typ)

LTM8003 Typical Application n 3.3VOUT from 5VIN to 40VIN

Step-Down Converter

FMEA Compliant Pinout n 6.25mm × 9mm × 3.32mm BGA Package

CISPR 25 Class 5 Peak Radiated n DC2416A (LTM8003 Demo Board) n VOUT = 5V, Spread Spectrum Enabled

Part Number

Input Voltage (V) Output Voltage (V)

IOUT (A)Clock Sync

Range (MHz)Parallelable Output

(Total IOUT)*Package

Dimensions (mm) PackageMin Max Min Max

CISPR 22 Class B Compliant, Step-Down µModule Regulators

LTM8053 3.4 40 0.97 15 3.5 (Continuous) 6 (Peak) 0.2 to 3 ×2 (7A) 6.25 × 9 × 3.32 BGA

LTM8073 3.6 60 0.8 15 3 (Continuous) 5 (Peak) 0.2 to 3 ×2 (6A) 6.25 × 9 × 3.32 BGA

EN55022 Class B Certified, Step-Down µModule Regulators

LTM8020 4 36 1.2 5 0.2 – – 6.25 × 6.25 × 2.32 LGA LTM8021 3 36 0.8 5 0.5 – – 6.25 × 11.25 × 2.82 LGALTM8031 3.6 36 0.8 10 1 0.25 to 2.0 ×2 (2A) 9 × 15 × 2.82 LGA

LTM8032 3.6 36 0.8 10 2 0.25 to 2.0 ×2 (4A) 9 × 15 × 2.82 9 × 15 × 3.42

LGA BGA

LTM8033 3.6 36 0.8 24 3 0.25 to 2.0 ×2 (6A) 11.25 × 15 × 4.32 11.25 × 15 × 4.92

LGA BGA

LTM4623 4* 20 0.6 5.5 3 0.56 to 4 ×2 (6A) 6.25 × 6.25 × 1.82 6.25 × 6.25 × 2.42

LGA BGA

LTM4624 4* 14 0.6 5.5 4 - - 6.25 × 6.25 × 5.01 BGALTM4612 5 36 3.3 15 5 0.18 to 1.3 ×2 (10A) 15 × 15 × 2.82 LGA

LTM4606 4.5 28 0.6 5 6 0.7 to 1.1 ×2 (12A) 15 × 15 × 2.82 15 × 15 × 3.42

LGA BGA

LTM4613 5 36 3.3 15 8 0.18 to 1.3 ×2 (16A) 15 × 15 × 4.32 15 × 15 × 4.92

LGA BGA

CISPR 25 Class 5 Compliant, Step-Down µModule Regulator

LTM8003 3.4 40 0.97 18 3.5 (Continuous) 6 (Peak) 0.2 to 3 – 6.25 × 9 × 3.32 BGA

*Number of devices in parallel tested and verified by Linear Technology.

fSW = 2MHzIOUT = 3.5A

FREQUENCY (MHz)0 200 400 600 800 1000

–10

0

10

20

30

40

50

AMPL

ITUD

E (d

BuV/

m)

4.7µF

100µF49.9k850kHz

LTM8003-3.3

VOUT

BIAS

VOUT3.3V4A

VINVIN5V TO 40V

GND

RUN

SYNC

RT

0317A

www.linear.com/umodule_lowemi n 1-800-4-LINEAR

18


µModule Regulators

APPLICATIONS

LTM4622A Dual Ultrathin 2A or Single 4A Step-Down DC/DC µModule Regulator

The LTM4622A is a complete dual 2A step-down switching mode µModule (micromodule) regulator in a tiny ultrathin 6.25mm × 6.25mm × 1.82mm LGA and 2.42mm BGA packages. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 3.6V to 20V, the LTM4622A supports an output voltage range of 1.5V to 12V, set by a single external resistor. Its high efficiency design delivers dual 2A continuous, 3A peak, output current. Only a few ceramic input and output capacitors are needed.

The LTM4622A supports selectable Burst Mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.

Fault protection features include input overvoltage, output overcurrent and overtemperature protection.

The LTM4622A is available with SnPb (BGA) or RoHS compliant terminal finish.

Product Selection GuidePART NUMBER VIN RANGE VOUT RANGE IOUT

LTM46223.6V to 20V

0.6V to 5.5V Dual 2.5A or Single 5A

LTM4622A 1.5V to 12V Dual 2A or Single 4A

n Complete Solution in <1cm2

n Wide Input Voltage Range: 3.6V to 20V n 1.5V to 12V Output Voltage n Dual 2A (3A Peak) or Single 4A Output Current n ±1.5% Maximum Total Output Voltage Regulation Error Over Load, Line and Temperature

n Current Mode Control, Fast Transient Response n External Frequency Synchronization n Multiphase Parallelable with Current Sharing n Output Voltage Tracking and Soft-Start Capability n Selectable Burst Mode® Operation n Overvoltage Input and Overtemperature Protection n Power Good Indicators n 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm × 6.25mm × 2.42mm BGA Packages

n General Purpose Point-of-Load Conversion n Telecom, Networking and Industrial Equipment n Medical Diagnostic Equipment n Test and Debug Systems

12V Input, 3.3V and 5V Output, Efficiency vs Load Current

LOAD CURRENT (A)0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0

70

75

80

85

90

95

100

EFFI

CIEN

CY (%

)

4622A TA01b

VOUT = 5VVOUT = 3.3V

3.3V and 5V Dual Output DC/DC Step-Down µModule Regulator

13.3k

4622A TA01a

4.7µF25V

VIN8V TO 20V

VOUT13.3V, 2A

47µF

VOUT1

VOUT25V, 2A

47µFVOUT2

FB1

COMP1

COMP2

GND

LTM4622A

PGOOD1 PGOOD2

VIN2

VIN1

RUN1

RUN2

INTVCC

SYNC/MODE

TRACK/SS1

TRACK/SS2

FREQ 8.25k

FB2

LGA PACKAGE25-LEAD (6.25mm × 6.25mm × 1.82mm)

TOP VIEW

COMP2SYNC/MODE

FREQ

VOUT1

FB1PGOOD1

TRACK/SS1

A

5

1

2

3

4

PGOOD2FB2

TRACK/SS2INTVCC

RUN2

B C D E

COMP1GND GND

RUN1

GNDVIN2

VIN2

VIN1

VIN1

VOUT2

LGA PACKAGE25-LEAD (6.25mm × 6.25mm × 1.82mm)

LTM4622AEVLTM4622AIV

BGA PACKAGE25-LEAD (6.25mm × 6.25mm × 2.42mm)

TOP VIEW

COMP2SYNC/MODE

FREQ

VOUT1

FB1PGOOD1

TRACK/SS1

A

5

1

2

3

4

PGOOD2FB2

TRACK/SS2INTVCC

RUN2

B C D E

COMP1GND GND

RUN1

GNDVIN2

VIN2

VIN1

VIN1

VOUT2

BGA PACKAGE 25-LEAD (6.25mm × 6.25mm × 2.42mm)

LTM4622AEYLTM4622AIY (SnPb)LTM4622AIY (RoHS)


Product Family Key Features & Part Numbers

Ultrathin Buck Regulators 1.8mm Height: LTM®4622, LTM4623

Buck-Boost Regulators LTM4607, LTM8055, LTM8056

Multiple Output Buck Regulators Dual: LTM4616, 4620, 4628, 4630 Triple: LTM4615 Quad: LTM4644 Quint: LTM8001, LTM8008

High Power Buck Regulators Up to 144A: Four in Parallel LTM4630

High Voltage Buck Regulators Up to 60V: LTM8027, LTM8050

Digital Interface Buck Regulators Dual Output: LTM4675, LTM4676, LTM4676A

Isolated Converters Up to 1500VDC: LTM8048, LTM8057, LTM8058

Ultralow Noise EN55022 Class B: LTM4606, LTM8033

LED Drivers Up to 36V LED String: LTM8040, LTM8042, LTM8042A

Battery Chargers Li-Ion, Li-Polymer, SLA, LiFePO4: LTM8061, LTM8062, LTM8062A

µModule Product Family Examples For More Information

www.linear.com/uModulepower

1-800-4-LINEAR

Our quickest, simplest and most integrated DC/DC power solutions are complete systems-in-a-package with integrated inductor, MOSFET, DC/DC regulator IC and supporting components. With over 100 power solutions available, each µModule product is qualified with Linear Technology’s stringent electrical, package and thermal reliability tests. Simplify and speed your power system development with µModule power products. Our µModule products are available in both BGA and LGA packages.

Simple & Done

Over 100 µModule® Power Solutions

Complete Power System-in-a-Package



Product Family Key Features & Part Numbers

Ultrathin Buck Regulators 1.8mm Height: LTM®4622, LTM4623

Buck-Boost Regulators LTM4607, LTM8055, LTM8056

Multiple Output Buck Regulators Dual: LTM4616, 4620, 4628, 4630 Triple: LTM4615 Quad: LTM4644 Quint: LTM8001, LTM8008

High Power Buck Regulators Up to 144A: Four in Parallel LTM4630

High Voltage Buck Regulators Up to 60V: LTM8027, LTM8050

Digital Interface Buck Regulators Dual Output: LTM4675, LTM4676, LTM4676A

Isolated Converters Up to 1500VDC: LTM8048, LTM8057, LTM8058

Ultralow Noise EN55022 Class B: LTM4606, LTM8033

LED Drivers Up to 36V LED String: LTM8040, LTM8042, LTM8042A

Battery Chargers Li-Ion, Li-Polymer, SLA, LiFePO4: LTM8061, LTM8062, LTM8062A

µModule Product Family Examples For More Information

www.linear.com/uModulepower

1-800-4-LINEAR

Our quickest, simplest and most integrated DC/DC power solutions are complete systems-in-a-package with integrated inductor, MOSFET, DC/DC regulator IC and supporting components. With over 100 power solutions available, each µModule product is qualified with Linear Technology’s stringent electrical, package and thermal reliability tests. Simplify and speed your power system development with µModule power products. Our µModule products are available in both BGA and LGA packages.

Simple & Done

Over 100 µModule® Power Solutions

Complete Power System-in-a-Package


20



APPLICATIONS

LTC3636/LTC3636-1 Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator

n Distributed Power Systems n Battery-Powered Instruments n Point-of-Load Power Supplies

n Wide VIN Range: 3.1V to 20V n Wide VOUT Range:

n 0.6V to 5V (LTC3636) n 1.8V to 12V (LTC3636-1)

n Output Current per Channel: 6A n High Efficiency: Up to 95% n Die Temperature Monitor n Adjustable Switching Frequency: 500kHz to 4MHz n External Frequency Synchronization n Current Mode Operation for Excellent Line and Load Transient Response

n 0.6V Reference Allows Low Output Voltages n User-Selectable Burst Mode Operation or Forced Continuous Operation

n Output Voltage Tracking and Soft-Start Capability n Short-Circuit Protected n Overvoltage Input and Overtemperature Protection n Power Good Status Outputs n Low Profile 4mm × 5mm 28-Lead QFN Package

The LTC3636/LTC3636-1 is a high efficiency, dual channel monolithic synchronous buck regulator using a controlled on-time current mode architecture, with phase-lockable switching frequency. The operating supply voltage range is from 3.1V to 20V, making it suitable for lithium-ion battery stacks as well as point-of-load power supply applications from a 12V or 5V input.

The operating frequency is programmable from 500kHz to 4MHz with an external resistor and may be synchronized to an external clock signal. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant-frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequency while demanding fast transient response.

The LTC3636/LTC3636-1 can select between forced continuous mode and high efficiency Burst Mode operation. The LTC3636 and LTC3636-1 differ in their output voltage sense range.

Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611.


fSW = 2MHzVIN = 12V

VOUT = 5VVOUT = 3.3V

LOAD CURRENT (A)0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6.0

70

73

76

79

82

85

88

91

94

97

100EF

FICI

ENCY

(%)

3636 TA01b

RUN1RUN2

TRACKSS2PGOOD2

LTC3636/LTC3636-1

TMON

BOOST20.1µF

0.56µH

10k

SW2

GND

VIN2 VIN1

VFB2

TRACKSS1PGOOD1BOOST1

SW1

VFB1

73.2k

10k

45.3k47µF

VOUT2 5V AT 6A

0.1µF

0.56µHVOUT13.3V AT 6A

VIN 10V TO 20V

22pF47µF

47µFx2

MODE/SYNCRT

ITH1ITH2

INTVCC

4.7µF

3636 TA01a

22pF

9 10

TOP VIEW

UFD PACKAGEVARIATION: AA

28-LEAD (4mm × 5mm) PLASTIC QFN

11 12 13

28 27 26 25 24

14

23

6

5

4

3

2

1ITH1

RUN1

MODE/SYNC

RT

INTVCC

TMON

RUN2

ITH2

VIN1

VIN1

SW1

GND

GND

SW2

VIN2

VIN2

V FB1

PGOO

D1

TRAC

KSS1

GND

SW1

BOOS

T1

V FB2

PGOO

D2

TRAC

KSS2

GND

SW2

BOOS

T2

7

17

18

19

20

21

22

16

8 15

29INTVCCT

34SW2T

31GNDT

33SW1T

32GNDT

30GNDT

UFD PACKAGE VARIATION: AA

28-LEAD (4mm × 5mm) PLASTIC QFNLTC3636IUFDLTC3636EUFD

LTC3636IUFD-1LTC3636EUFD-1

21



APPLICATIONS

LTC7103 105V, 2.3A Low EMI Synchronous Step-Down Regulator

The LTC7103 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant-frequency, average current mode control architecture. It operates from an input voltage range of 4.4V to 105V and provides an adjustable regulated output voltage from 1V to VIN while delivering up to 2.3A of output current.

The LTC7103 features high frequency operation and a low minimum on-time that reduce inductor size and enable constant-frequency operation even at very high step-down ratios. In addition, the LTC7103 achieves the lowest possible dropout voltage with 100% maximum duty cycle operation. During light load operation, converter efficiency and output ripple can be optimized by selecting Burst Mode or pulse-skipping operation.

The LTC7103 includes accurate, high speed average current programming and monitoring without the need for an external sense resistor. Additional features include a bypass LDO to maximize efficiency, fixed or adjustable output voltage and loop compensation and a wide array of protection features to enhance reliability.

n Wide VIN Range: 4.4V to 105V (110V Abs Max) n Ultralow EMI/EMC Emissions: CISPR 25 Compliant n 2µA IQ When Regulating 48VIN to 3.3VOUT n Fast and Accurate Output Current Programming and Monitoring with No External RSENSE

n Brick Wall Current Limit n Low Minimum On-Time: 40ns n Wide VOUT Range: 1V to VIN n 100% Maximum Duty Cycle Operation n Programmable Fixed Frequency: 200kHz to 2MHz n Eight, Pin-Selectable Fixed (1.2V to 15V) or Adjustable Output Voltages

n Selectable Pulse-Skipping or Low Ripple Burst Mode Operation at Light Loads

n PLL Synchronization to External Clock n EXTVCC LDO Powers Chip from VOUT = 3.3V to 40V n OPTI-LOOP® or Fixed Internal Compensation n Input and Output Overvoltage Protection n Thermally Enhanced (5mm × 6mm) QFN Package

n Battery Chargers and CC/CV Supplies n Automotive and Military Systems n Industrial, Avionics and Heavy Equipment n Medical Instruments and Telecommunication Systems

5V to 105V Input to 5V/2.3A Output Step-Down Regulator

7103 TA01a

VFB

EXTVCC

VPRG2

FREQ

BOOST

SW

VIN

RUN

ICTRL

IMONCURRENTMONITOR

4.7µF

1µF

VOUT5V2.3A

VIN5V TO 105V

OVLO

PLLIN/MODE

LTC7103

INTVCC

ITH

PGNDSGND

100µF

0.1µF18µH


VOUT = 5V

VIN = 12VVIN = 24VVIN = 48VVIN = 72V

LOAD CURRENT (mA)0.1 1 10 100 1000

50

55

60

65

70

75

80

85

90

95

100

EFFI

CIEN

CY (%

)

7103 TA01b

fSW = 300kHzFIGURE 13 CIRCUIT

11 12 13 14

TOP VIEW

PGND37

UHE36(26) PACKAGE36-LEAD (5mm × 6mm) PLASTIC QFN

15 16 17 18

36 35 32 31 30

21

24

25

26

27

8

7

6

3RUN

SGND

OVLO

RIND

ITH

VFB

BOOST

SW

SW

SW

INTVCC

EXTVCC

VPRG2

PGND

PGND

V IN

V IN

V IN

FREQ

PLLI

N/M

ODE

CLKO

UT

PGOO

D SS

I CTR

L

I MON

V PRG

1

20

19

9

10

UHE36(26) PACKAGE 36-LEAD (5mm × 6mm) PLASTIC QFN

LTC7103EUHELTC7103IUHELTC7103HUHE

LTC7103MPUHE

22



APPLICATIONS

LTC7124 17V, Dual 3.5A Synchronous Step-Down Regulator with Ultralow Quiescent Current

The LTC7124 is a dual channel, 3.5A per output, high efficiency monolithic step-down regulator capable of operating from input supplies up to 17V. The programmable switching frequency ranges from 500kHz to 4MHz with a ±25% external clock synchronization capability around the programmed frequency. The regulator features ultralow quiescent current for high efficiency over a wide VOUT range.

The step-down regulator operates from an input voltage range of 3.1V to 17V and provides an adjustable output range from 0.6V to 99% of VIN while delivering up to 3.5A of output current per channel. A user-selectable mode input is provided to allow the user to trade off output ripple for light load efficiency. Burst Mode

operation provides the highest efficiency at light loads, while forced continuous mode provides the lowest output ripple. The LTC7124 includes spread spectrum modulation for low radiated and conductive noise. The LTC7124 is offered in a thermally enhanced, low profile 24-lead 3mm × 5mm QFN package.

n Wide VIN Range: 3.1V to 17V n Wide VOUT Range: 0.6V to 99% VIN n Dual Step-Down Outputs: 3.5A per Channel n Integrated 80mΩ/40mΩ N-Channel MOSFETs Provide Up to 95% Efficiency

n No Load IQ < 8μA with Both Channels Enabled; IQ < 5.5μA with Only One Channel Enabled

n Programmable Frequency (500kHz to 4MHz) with ±25% Frequency Synchronization Range

n Configurable for a Two-Phase Single Output at Up to 7A n ±1.0% Output Voltage Accuracy n Current Mode Operation for Excellent Line and Load Transient Response

n Internal or Programmable External Loop Compensation n Available in a 3mm × 5mm QFN-24 Package

n Battery-Powered Systems n Point-of-Load Supplies n Portable Instruments n Handheld Scanners

1.8V/3.3V 1MHz Step-Down Regulator

CIN47µF

2.2µFCINTVCC

RRT100k

CBOOST20.1µF

COUT2100µF

R3619k

R4137k

L21.8µH

CFF216pF

CBOOST10.1µF

COUT1100µF

R1619k

R2309k

L11.2µH

CFF122pF

LTC7124

7124 TA01

VIN1 VIN2RUN1RUN2

ILIM GND

FB1 FB2

SW1 SW2

BOOST1 BOOST2

INTVCC

ITH1ITH2

RT

MODE/SYNC

VOUT11.8V AT 3.5A

VOUT23.3V AT 3.5A

VIN10.8V TO 13.2V

x2

Efficiency and Power Loss vs Load Current at 1MHz

VIN = 12V

VOUT = 5.0VVOUT = 3.3VVOUT = 2.5VVOUT = 1.8V

LOAD CURRENT (A)0 0.5 1 1.5 2 2.5 3 3.5

0

10

20

30

40

50

60

70

80

90

100

0

0.4

0.8

1.2

1.6EF

FICI

ENCY

(%)

POWER LOSS (W

)

7124 TA01a

Protected by U.S. Patents, including 5481178, 6580258, 6498466, 6611131, 6177787, 5705919, 5847554.

9 10

TOP VIEW

UDD PACKAGEVARIATION: AA

24-LEAD (3mm × 5mm) PLASTIC QFN

11 12

24

25GND

26GND

23 22 21

6

5

4

3

2

1

7

15

16

17

18

19

20

14

8 13

GND

GND

VIN1

ILIM

RT

VIN2

GND

GND

SW1

SW1

BOOST1

MODE/SYNC

INTVCC

BOOST2

SW2

SW2

FB1

ITH1

PGOO

D1

RUN1

FB2

ITH2

PGOO

D2

RUN2

UDD PACKAGE VARIATION: AA

24-LEAD (3mm × 5mm) PLASTIC QFNLTC7124EUDDLTC7124IUDD

23



APPLICATIONS

LTC7150S 20V, 20A Synchronous Step-Down Regulator

The LTC7150S is a high efficiency monolithic synchronous buck regulator capable of delivering 20A to the load. It uses a phase-lockable controlled on-time constant-frequency, current mode architecture. PolyPhase operation allows multiple LTC7150S regulators to run out-of-phase, which reduces the amount of input and output capacitors required. The operating supply voltage range is from 3.1V to 20V.

The operating frequency is programmable from 400kHz to 3MHz with an external resistor. The high frequency capability allows the use of physically smaller inductor and capacitor sizes. For switching noise sensitive applications, the LTC7150S can be externally synchronized from 400kHz to 3MHz. The PHMODE pin allows the user control of the phase of the outgoing clock signal. The unique constant-frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. The LTC7150S uses second generation Silent Switcher technology including integrated bypass capacitors to deliver a highly efficient solution at high frequencies with excellent EMI performance.

n Silent Switcher 2 Architecture for Low EMI n VIN Range: 3.1V to 20V n VOUT Range: 0.6V to 5.5V n Differential VOUT Remote Sense n Adjustable Frequency: 400kHz to 3MHz n PolyPhase® Operation: Up to 12 Phases n Output Tracking and Soft-Start n Reference Accuracy: 0.6V ±1% Over Temperature n Current Mode Operation for Excellent Line and Load Transient Response

n Accurate 1.2V Run Pin Threshold n Supports Forced Continuous/Discontinuous Modes n 42-Lead 6mm × 5mm × 1.3mm BGA Package

n Server Power Applications n Distributed Power Systems n Point-of-Load Supply for ASIC, FPGA, DSP, µP, etc.

Efficiency and Power Loss

SVIN = 5V

IOUT (A)0 4 8 12 16 20

70

75

80

85

90

95

100

0

2

4

6

8

10

12

EFFI

CIEN

CY (%

)

POWER LOSS (W

)

7150S TA01b

F

G

E

A

B

C

D

5 63 421

PHMODE

BGA PACKAGE42-LEAD (6mm × 5mm × 1.30mm)

TOP VIEW

SW SW PGND PGNDPGND PGND



SW SW PVIN PVINPVIN PVIN

SW SW PVIN PVINSVIN PVIN

M/S TRACK/SS SGND INTVCCCLKOUT RUN

RT ITH FB VOUT–PGOOD

BGA PACKAGE 42-LEAD (6mm × 5mm × 1.30mm)

LTC7150SEYLTC7150SIY 12VIN to 1.2VOUT Application

7150S TA01a

RUNPVINSVIN

SW

FB

PHMODETRACK/SSCLKOUTINTVCC

VOUT–

PGOODMODE/SYNC

SGND

LTC7150S22µF×2

VIN3.1V TO 20V

0.25µH

RT ITH4.7µF

162k 10k

1nF 22pF

10k

10k

100µF×2 330µF

VOUT1.2V/20A

+

24



APPLICATIONS

LTC7800 Low IQ, 60V, High Frequency Synchronous Step-Down Controller

The LTC7800 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 2.25MHz.

The 50μA no load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7800 features a precision 0.8V reference and power good output indicator. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC7800 can be programmed between 0.8V to 24V.

The TRACK/SS pin ramps the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode or continuous conduction mode at light loads.

n Wide VIN Range: 4V to 60V (65V Abs Max) n Low Operating IQ: 50μA n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n RSENSE or DCR Current Sensing n Phase-Lockable Frequency (320kHz to 2.25MHz) n Programmable Fixed Frequency (320kHz to 2.25MHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode Operation at Light Load

n Selectable Current Limit n Very Low Dropout Operation: 98% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Power Good Output Voltage Monitor n Output Overvoltage Protection n Low Shutdown IQ: < 14μA n Internal LDO Powers Gate Drive from VIN or EXTVCC n No Current Foldback During Start-Up n Small 20-Lead 3mm × 4mm QFN Package

n Automotive Always-On Systems n Battery-Powered Digital Devices n Distributed DC Power Systems

Protected by U.S. Patents, including 5481178, 5705919, 6611131, 6498466, 6580258, 7230497.

High Efficiency 3.3V 2.1MHz Step-Down Regulator

0.33µH 4mΩ

357k

115k

2.2µF

0.1µF

33µF

100k

100k

2.49k820pF

80pF

0.1µF

VIN

PGOOD

EXTVCC

INTVCC

PGND

FREQ

ITH

TRACK/SS

SGND

TG

BOOST

SW

BG

SENSE+

SENSE–

VFB

LTC7800

C2.2µF C

56µF

INTVCC

V

28V

IN

3.3VVOUT

10A

4V TO

×2

COUT

I1I2

×3

Efficiency and Power Loss vs Output Current

VIN = 12VVOUT = 3.3V

OUTPUT CURRENT (A)0.0001 0.001 0.01 0.1 1 100

10

20

30

40

50

60

70

80

90

100

0.0001

0.001

0.01

0.1

1

10EF

FICI

ENCY

(%)

POWER LOSS (W

)

3874 TA01b

20 19 18 17

7 8

TOP VIEW

21SGND

UDC PACKAGE20-LEAD (3mm × 4mm) PLASTIC QFN

9 10

6

5

4

3

2

1

11

12

13

14

15

16PLLIN/MODE

SGND

SGND

RUN

SENSE–

SENSE+

PGND

EXTVCC

INTVCC

BG

BOOST

SW

FREQ

TRAC

K/SS

I LIM

V IN

V FB

ITH

PGOO

D TG

UDC PACKAGE 20-LEAD (3mm × 4mm) PLASTIC QFN

LTC7800EUDCLTC7800IUDCLTC7800HUDC

25



APPLICATIONS

LTC7801 150V Low IQ, Synchronous Step-Down DC/DC Controller

The LTC7801 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 850kHz.

The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. An internal charge pump allows for 100% duty cycle operation.

The low 40μA no load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7801 features a precision 0.8V reference and power good output indicator. The output voltage can be programmed between 0.8V to 60V using external resistors.

n Wide VIN Range: 4V to 140V (150V Abs Max) n Wide Output Voltage Range: 0.8V to 60V n Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE) n Low Operating IQ: 40μA (Shutdown = 10μA) n 100% Duty Cycle Operation n No External Bootstrap Diode Required n Selectable Gate Drive UVLO Thresholds n Onboard LDO or External NMOS LDO for DRVCC n EXTVCC LDO Powers Drivers from VOUT n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode Operation at Light Loads

n Adjustable Burst Clamp n Power Good Output Voltage Monitor n Programmable Input Overvoltage Lockout n Small 24-Lead 4mm × 5mm QFN or TSSOP Packages

n Automotive and Industrial Power Systems n High Voltage Battery Operated Systems n Telecommunications Power Systems

Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.

Efficiency and Power Loss vs Load Current

POWER LOSSVIN = 48V

EFFICIENCY

VIN = 24V

LOAD CURRENT (A)0.0001 0.001 0.01 0.1 1 100

10

20

30

40

50

60

70

80

90

100

1

10

100

1k

10kEF

FICI

ENCY

(%)

POWER LOSS (m

W)

7801 TA01b

High Efficiency High Voltage 12V Output Step-Down Regulator

0.1µF

4.7µF

7801 TA01a

6mΩ

511k

150µF

36.5k

1nF

0.1µF

0.1µF

10k

4.7nF

100pF

100µF

33µH

30.1k

VIN

INTVCC

CPUMP_EN

ITH

SS

FREQ

GND

LTC7801

TG

SW

BG

SENSE+

SENSE–

EXTVCC

VFB

BOOST

RUNNDRV

DRVCC

VIN7V to 140V

VOUT12V*5A

x3

*VOUT FOLLOWS VIN WHEN VIN < 12V

1

2

3

4

5

6

7

8

9

10

11

12

TOP VIEW


24

23

22

21

20

19

18

17

16

15

14

13

SENSE–

SS

VFB

ITH

MODE

GND

CRUMP_EN

PLLIN

PGOOD

FREQ

DRVSET

DRVUV

SENSE+

OVLO

INTVCC

RUN

EXTVCC

VIN

NDRV

DRVCC

BG

BOOST

SW

TG

25


LTC7801EFELTC7801IFELTC7801HFE

8 9

TOP VIEW


25

10 11 12

24 23 22 21 20

6

5

4

3

2

1VFB

ITH

MODE

GND

CPUMP_EN

PLLIN

PGOOD

RUN

EXTVCC

VIN

NDRV

DRVCC

BG

BOOST

SS SENS

E–

SENS

E+

OVLO

INTV

CC

FREQ

DRVS

ET

DRVU

V TG SW

7

14

15

16

17

18

19

13


LTC7801EUFDLTC7801IUFDLTC7801HUFD

26



APPLICATIONS

LT8390A 60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum

n 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT

n Up to 95% Efficiency at 2MHz n Proprietary Peak-Buck Peak-Boost Current Mode n Wide VIN Range: 4V to 60V n ±1.5% Output Voltage Accuracy: 1V ≤ VOUT ≤ 60V n ±3% Input or Output Current Accuracy with Monitor n Spread Spectrum Frequency Modulation for Low EMI n High Side PMOS Load Switch Driver n No Top MOSFET Refresh Noise in Buck or Boost n Adjustable and Synchronizable: 600kHz to 2MHz n VOUT Disconnected from VIN During Shutdown n Available in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)

n Automotive, Industrial, Telecom Systems n High Frequency Battery-Powered System

Efficiency vs VIN

CONTINUOUS OPERATION WITH HIGHEST COMPONENT TEMPERATURE BELOW 90°C (TA = 25°C)

IOUT = 4AIOUT = 2A

INPUT VOLTAGE (V)0 5 10 15 20 25 30 35 40

50

60

70

80

90

100

EFFI

CIEN

CY (%

)

8390a TA01b

95% Efficient 48W (12V 4A) 2MHz Buck-Boost Voltage Regulator

169k

22nF

0.1µF0.1µF22µF

383k

4.7µF 100k

0.47µF

59.0k

2.2nF

10k

110k

10k

0.1µF

133k100k

0.1µF

1µF 1µF

1µH

1µF

10Ω

10Ω

22µF

22µF

4.7µF

5mΩ 10mΩ

EN/UVLO

VREF

CTRL

PGOOD

BG2

BST2

TG2

INTVCC

LOADEN

FB

VOUT

ISP

ISN

SYNC/SPRD

TEST

VIN6V TO 28V

CONTINUOUS4V TO 56V

TRANSIENT

2MHz

63V100V

×216V×2

ISMON

PGOOD

16V

VOUT12V4A

LSP LSNSW1 SW2BST1

TG1

BG1

VINLT8390A

LOADTG

ISMON

SS VC RT

GND

SSFM OFF

SSFM ON

16V×2

100V×2

INTVCCINTVCC

INTVCC

8390a TA01a

9 10

TOP VIEW

29GND


11 12 13

28 27 26 25 24

14

23

6

5

4

3

2

1TG1

LSP

LSN

VIN

INTVCC

EN/UVLO

TEST

LOADEN

TG2

VOUT

LOADTG

SYNC/SPRD

RT

VC

FB

SS

SW1

BST1

BG1

BG2

BST2

SW2

V REF

CTRL IS

P

ISN

ISM

ON

PGOO

D

7

17

18

19

20

21

22

16

8 15


LT8390AEUFDLT8390AIUFDLT8390AHUFD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

TOP VIEW


28

27

26

25

24

23

22

21

20

19

18

17

16

15

BG1

BST1

SW1

TG1

LSP

LSN

VIN

INTVCC

EN/UVLO

TEST

LOADEN

VREF

CTRL

ISP

BG2

BST2

SW2

TG2

VOUT

LOADTG

SYNC/SPRD

RT

VC

FB

SS

PGOOD

ISMON

ISN

29GND


LT8390AEFELT8390AIFELT8390AHFE

The LT8390A is a synchronous 4-switch buck-boost DC/DC controller that regulates output voltage, input or output current from an input voltage above, below or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 600kHz to 2MHz fixed frequency operation or internal 25% triangle spread spectrum frequency modulation for low EMI. With a 4V to 60V input voltage range, 0V to 60V output voltage capability, and seamless low noise transitions between operation regions, the LT8390A is ideal for voltage regulator, battery and supercapacitor charger applications in automotive, industrial, telecom and even battery-powered systems.

The LT8390A provides input or output current monitor and power good flag. Fault protection is also provided to detect output short-circuit condition, during which the LT8390A retries, latches off or keeps running.

Lower Power Op Amp: Utility Sine WaveDesign Note 564

Catherine Chang, Philip Karantzalis and Aaron Schultz

07/17/564

Figure 1. 10kHz Bandpass Filter

–+

V+

V+

OUTLTC6258

DN5AS F04

R52.49k

C41nF

C41µF

RA21MΩ

RA11MΩ

R847.5k

R747.5k

R6100k

C31nF

C21nF

IntroductionOur op amp family has expanded with industry-leading speed versus supply current. The LTC®6258/LTC6259/LTC6260 family (single, dual, quad) pro-vides 1.3MHz at a super low 20µA supply current, with 400µV maximum offset voltage and rail-to-rail input and output. In combination with a 1.8V to 5.25V supply, this op amp enables applications requiring uncompromised performance with low power and low voltage at reasonable cost.

Utility Sine WaveOne does not expect to generate a sine wave with –100dBc distortion using a 5V low power op amp. All the same, a bandpass filter using the LTC6258 can combine with an easy-to-use low power oscillator to create a sine wave at low cost, low voltage and extremely low dissipation.

Active FilterThe bandpass filter of Figure 1 is AC coupled to an input. As a result, the LTC6258 input does not place a burden on the previous stage to develop a particular absolute common mode voltage. A simple resistor

divider with RA1 and RA2 provides biasing for the LTC6258 bandpass filter. Pegging the op amp inputs to a fixed voltage helps to reduce distortion that might arise with moving common mode.

This filter is centered at 10kHz. The exact resistance and capacitance values can be tweaked upward or downward, depending on whether lowest resistor noise or lowest total supply current is most important. This implementation was optimized for low dissipa-tion by reducing current in the feedback loop. The capacitors C2 and C3 were initially 4.7nF or higher, with lower resistor values. In the end, 1nF with higher resistors optimized for lower dissipation.

Besides power dissipation, a secondary but no less important aspect of feedback impedance is load-ing of the op amp rail-to-rail output stage. Heavier loading, such as between 1K and 10K impedance, significantly lowers open loop gain, which in turn affects the accuracy of the bandpass filter. The data sheet suggests AVOL reduces by a factor of 5 from L, LT, LTC, LTM, Linear Technology, TimerBlox and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.

Figure 2. Bandpass Filter Gain/Phase vs Frequency

FREQUENCY (kHz)0.1 1 10 100

–60.0

–54.0

–48.0

–42.0

–36.0

–30.0

–24.0

–18.0

–12.0

–6.0

0

GAIN

(dB)

DN5AS F05

DN564 LT/TP 0717 71K • PRINTED IN THE USA

100kΩ to 10kΩ. Lower C2 and C3 might be feasible, but then R6 becomes even larger, introducing more noise at the output.

The target Q of this bandpass filter is moderate – approximately 3. A moderate Q, rather than a high Q, allows for use of 5% capacitors. Higher Q will demand more accurate capacitors, and very likely higher open loop gain at 10kHz than is available with the feedback impedance load. Naturally, moderate Q results in less attenuation of harmonics than a higher Q.

Adding The OscillatorA low power sine wave generator can be derived by driving a square wave into the bandpass filter. A complete schematic is shown in Figure 3. The LTC6906 micropower resistor-set oscillator easily configures as a 10kHz square wave, and can drive the relatively benign loading seen in the bandpass filter input resistors. Supply current of the LTC6906 at 10kHz is 32.4µA.

Figure 4 shows the LTC6906 output and bandpass filter output. HD2 of the sine wave is –46.1dBc, and HD3 –32.6dBc. The output was 1.34VP-P to 1.44VP-P with exact level varying slightly due to finite op amp

open loop gain at 10kHz. Total current consumption is below 55µA on a 3V rail.

Other EnhancementsFigure 5 shows optional enhancements. A low power reference takes advantage of the ability of the LTC6906 and LTC6258 to operate on a very low supply. The reference provides 2.5V from a battery input. The fixed 2.5V supply stabilizes the output voltage swing in the presence of varying input voltage. In addition, even lower filter capacitor values with higher resistances reduce LTC6258 loading further, lowering dissipation and improving filter accuracy.

ConclusionThe LTC6258/LTC6259/LTC6260 family (single, dual, quad) provides 1.3MHz gain bandwidth at a low 20µA supply current, with 400µV maximum offset voltage and rail-to-rail input and output. In combination with 1.8V to 5.25V supply, this op amp enables applications requiring excellent performance with low power and low voltage at low cost.

Data Sheet Download

www.linear.com/LTC6258For applications help,

call (408) 432-1900, Ext. 3409

Figure 3.

–+

10kHz BANDPASS FILTER

10kHz SQUARE WAVEV+

V+

OUTLTC6258

DN5AS F06

R52.49kRSET

1M

C41nF

CD11µF

RA21MΩ

RA11MΩ

R847.5k

R747.5k

R6100k

C31nF

C21nF

V+

V13

V+ V+

DIV

GND

OUT

SET

GRD

LTC6906OSC_OUT

+–

10kHz Oscillator Circuit Using LTC6906 TimerBlox® Input

© LINEAR TECHNOLOGY CORPORATION 2017

Figure 4.

TIME (µs)0 60 120 180 240 300

–0.5

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

VOLT

AGE

(V)

DN5AS F07

FILTER OUTPUT

OSCILLATOR

Voltage Waveforms Oscillator and Filter Output

Figure 5.

–+

10kHz BANDPASS FILTERMODIFIED FOR LOWER POWER

10kHz SQUARE WAVE

USE µPOWER VREF FOR VP-P CONTROL

V+

V+

OUTLTC6258

DN5AS F08

R12.49kRSET

1M

C3680pF

CD11µF

RA21MΩ

RA11MΩ

R475k

R375k

R2200k

C2680pF

C1680pF

V1(VB)

VBATT(IN)

LITHIUM PRIMARYBUTTON CELL CR1220–10°C TO 60°C

V+

DIV

GND

OUT

SET

GRD

LTC6906OSC_OUT

+–C80.1µF

C71µF

IN OUTGND

LT6656-2.5V+

Oscillator and Filter with a Regulated Supply

DC/DC POWER SUPPLY

LTC3643BACKUP

CRITICALLOAD

DN565 F01

1(a)

VIN

D1

DC/DC POWER SUPPLY

LTC3643BACKUP

CRITICALLOAD

1(b)

VIN

D2

Simple Power Backup Supply for a 3.3V RailDesign Note 565

Victor Khasiev

08/17/565

Figure 1(a) and (b). Location of the Blocking Diode in the Backup System Schematic

IntroductionData loss is a concern in telecom, industrial and automotive applications where embedded systems require a dependable supply of power. Sudden power interruptions can corrupt data during read and write operations performed by hard drives and flash memory. Designers often use batteries, capacitors and supercaps to store enough energy to support criti-cal loads for a short time during a power interruption.

The LTC®3643 power backup supply allows designers to use a relatively inexpensive storage component: low cost electrolytic capacitors. In the backup or holdup supply presented here, the LTC3643 charges a storage capacitor to 40V when power is present, and discharges it to the critical load when power is inter-rupted. The load (output) voltage can be programmed to any voltage between 3V and 17V.

The LTC3643 easily fits backup solutions for 5V and 12V rails, but a 3.3V rail solution requires extra care. The minimum operating voltage of the LTC3643 is 3V, relatively close to the nominal 3.3V input volt-age level. This is too tight when a blocking diode is used to decouple the backup voltage source from noncritical circuitry as shown in Figure 1a. If D1 is a Shottky diode, its forward voltage drop—as a function of load current and temperature—can reach 0.4V to 0.5V, enough to place the voltage at the LTC3643 VIN pin below the 3V minimum. As a result, the backup supply circuit may not start up.

One possible solution is to move the diode to the input of the supplying DC/DC converter, D2, as shown in Figure 1b. Unfortunately, in this scenario, noncritical loads connected to the upstream DC/DC supply can draw power from the backup supply, leaving less energy for critical loads.

3.3V Backup Supply OperationFigure 2 shows a solution to producing a 3.3V backup supply that reserves energy for critical loads using a blocking MOSFET. The blocking diode shown in Figure 1 is replaced by Q1, a low gate threshold voltage power P-channel MOSFET.

The key to operating the backup supply in a 3.3V environment is the addition of the series RA-CA circuit. At start-up, as the input voltage rises, the current through the capacitor CA is governed by the equation IC = C • (dV/dt). This current generates a potential across RA, enough to enhance Q2, a low gate threshold voltage small signal N-channel MOSFET. As Q2 turns on, it pulls the gate of the Q1 to ground, providing an extremely low resistance path from the input voltage to the supply pins VIN of LTC3643. Once 3.3V is applied to the converter, it starts up, pulling down both the gate of Q1 and the PFO pin, and it starts charging the storage capacitor.

As the 3.3V rail reaches steady state, the IC current reduces to the point where the voltage across RA falls below the Q2 gate threshold level and Q2 turns off, no longer affecting the functionality of the backup converter. Also, the PFO pin grounds R3A, resetting the PFI pin power fail voltage level to the minimum 3V, to ensure that the converter remains operational when the input voltage source is disconnected.L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.

GATE Q1GATE Q2

VIN

VCAP*

200ms/DIV

1V/D

IV

*VCAP IS 10V/DIV; ALL OTHER VOLTAGES 1V/DIV

DN565 F03

GATE Q1

GATE Q2

VIN VCAP*

200ms/DIV

1V/D

IV

VIN

*VCAP IS 10V/DIV; ALL OTHER VOLTAGES 1V/DIV

DN565 F04

R151.1k

R326.1k

Q1, Si4403CDY

1M

R537.4k

R67.96k

RS, 0.05Ω

7.2µHTDKC2012X7S2A105K

22µF

R LOAD

0.1µF

4.7µF

470pF

402k

22pF

RBT322k

RBB511k

C STORAGER3A, 273k

Si2342DSQ2

RA100k

CA10µF/10V

D1BAT54WT

INDIS

INDIS

SW

SW

BOOST

CAP

FBCAP

ITHINTVCCILIM

IN

INCLPFBSYS

GATEPFI

CAPGDPFO

RUN

PGNDPGNDPGND

LTC3643EUUD

LOAD RAIL BACKUP 3.3V, 0.5A, 350ms

40V BACKUP RAILVCAP

VIN, 3.3V RAIL(3V TO 17V; SUPPORTS

3.3V, 5V AND

12V RAILS)

180µF+

4.7µF 1000µF+

DN565 F02

© LINEAR TECHNOLOGY CORPORATION 2017DN565 LT/AP 0817 71K • PRINTED IN THE USA

Figure 2. Enhanced Schematic of the LTC3643 Solution for a 3.3V Rail

Circuit Functionality The waveforms in Figure 3 show results as the 3.3V rail starts up. As the input voltage rises, so does the gate of Q2, pulling the gate of Q1 low. Q1 remains enhanced, allowing the full 3.3V to reach the LTC3643, bypassing the Q1 body diode. Eventually the gate of Q2 voltage drops below the threshold level and Q2 turns off—by this time the LTC3643 is fully operational and takes control over the gate of Q1.

charging current (maximum possible set limit is 2A); the rest is delivered to the load.

Figure 4 shows the waveforms when the 3.3V rail is lost. As the input voltage falls, the voltage at the gate of Q2 remains unchanged, close to ground, and Q2 remains off. In contrast, the voltage at the gate of Q1 rises sharply to 3.3V. This turns Q1 off, with the body diode of Q1 acting as a blocking diode, decoupling load from the input. At this point the backup supply takes over, with the LTC3643 supplying 3.3V to the critical load by discharging a storage capacitor.

Data Sheet Download

www.linear.com/LTC3643For applications help,

call (408) 432-1900, Ext. 3161

Figure 3. Waveforms of 3.3V Rail for Power-Up

Figure 4. Waveforms of 3.3V Rail for Power-Down The versatility of the LTC3643 is on display here: spe-cifically its ability to limit the charging current of the boost converter used to charge the storage capacitor. In cases where total current must be minimized, such as when there are long lines or high impedance volt-age sources. The boost current can be set relatively low to minimize the effect of charging current on the input voltage drop. This is particularly important for 3.3V rails. In Figure 2 the resistor, RS, 0.05Ω, sets a limit of 0.5A (10.5A load) for the boost converter

ConclusionThe circuit presented here enables the LTC3643 to be used as a backup supply solution for 3.3V rails. The LTC3643 simplifies backup supplies by employ-ing low cost electrolytic capacitors as the energy storage component.

© 2017 Analog Devices, Inc. • MC 0917 7.5K • Printed in U.S.A

Download White Paper“Battery Stack Management

Makes Another Leap Forward”

www.linear.com/docs/52618

1.2mV Accurate, Noise Immune Battery Stack Monitor

Info & Free Samples

www.linear.com/product/LTC6811

1-800-4-LINEAR

Measurement Error (mV)when Measuring a 3.3V Cell

Features

• Total Measurement Error <1.2mV

• Long Term Stability Assured with Laboratory-Grade Voltage Reference

• isoSPI, Isolated 2-Wire Interconnection up to 100 Meters

• 290μs to Measure All Cells

• Passive Cell Balancing

• 4μA Sleep Mode Supply Current

• AEC-Q100

• Engineered for ISO 26262 Compliance

Maximize Battery Pack Safety, Life, Capacity & Driving Range

, LT, LTC, LTM, Linear Technology and the Linear logo areregistered trademarks and isoSPI is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners.

Initial 25°CAccuracy

After PCBoard

Assembly

After 10Years of

Operation

10

8

6

4

2

0

LTC6811Using BuriedZener Technology

CompetitorsUsing BandgapTechnology

Safely extract the potential of large battery packs via precise monitoring of every cell. The LTC®6811 Battery Monitor measures cell voltage with less than 0.04% error, guaranteed. Measurement stability over time, temperature and operating conditions is achieved with a buried Zener voltage reference, similar to those in precision instrumentation. A programmable 3rd order noise filter keeps noise from corrupting cell measurements, and a 2-wire isoSPITM interface provides a cost-effective, noise immune, 100 meter interconnection for multiple LTC6811s.


2017 new products catalog - analog devices...2017 high performance analog ics new products catalog...

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