dc2253a - ltc3789egn: 300w 2-phase interleaved … · 4 dc2253af demo manual dc2253a quick start...
TRANSCRIPT
1dc2253af
DEMO MANUAL DC2253A
Description
LTC3789EGN300W 2-Phase Interleaved
Synchronous Buck-Boost Converter
Demonstration circuit 2253A is a high power, high ef-ficiency, 2-phase interleaved synchronous buck-boost converter with a 6V to 36V input range. It can supply a 25A maximum load current with a 12V output. This demo board features 2x LTC3789EGN controllers.
The LTC®3789 is a high performance current-mode buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage, while an output current feedback loop provides support for output current limit and battery charging. With a wide 4V to 38V (40V maximum) input and output range and seamless, low noise transitions between operating regions, the LTC3789 is ideal for automotive, telecom and battery-powered systems. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
The light load operating mode of the controller is de-termined through the MODE/PLLIN pin. By default, the forced continuous mode (CCM) operation is pre-selected on this demo board. Switching frequency is preset at about 200kHz. Two paralleling schemes are available for this demo board and by default the method of shared ITH pins is adopted. Please refer to the Quick Start Procedure section for the optional Master-Slave paralleling scheme. To shut down the converter, force the RUN pin below 1.2V (JP1: OFF) Please refer to LTC3789 data sheet for more detailed information.
Design files for this circuit board are available at http://www.linear.com/demo/DC2253A
Specifications are at TA = 25°C
PARAMETER CONDITION VALUE
Input Voltage Range 6V to 36V
Output Voltage, VOUT VIN = 6V to 36V, IOUT = 0A to 25A 12V ±2%
Maximum Output Current, IOUT VIN = 6V to 36V, VOUT = 12V 25A
Typical Output Ripple VIN = 36V, IOUT = 25A (20MHz BW) VIN = 12V, IOUT = 25A (20MHz BW) VIN = 6V, IOUT = 25A (20MHz BW)
36mVP-P 200mVP-P 380mVP-P
Typical Efficiency VIN = 12V, VOUT = 12V, IOUT = 25A, see Figure 3 97.8%
Typical Switching Frequency 200kHz
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DEMO MANUAL DC2253A
Quick start proceDureDemonstration circuit 2253A is easy to set up to evaluate the performance of the LTC3789EGN. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below:
1. With power off, connect the input power supply to VIN (6V to 36V) and GND (input return).
2. Connect the 12V output load between VOUT and GND (Initial load: no load).
3. Connect the DVMs to the input and output. Set the default jumper position, JP1: ON.
4. Turn on the input power supply and check for the proper output voltages. VOUT should be 12V ±2%.
5. Once the proper output voltages are established, ad-just the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters.
Note: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.
Optional Master-Slave Paralleling Scheme
Besides the default paralleling scheme by tying the ITH pins together, another optional Master-Slave scheme can be achieved on the demo board to obtain a better sharing of the inductor currents and output currents between phases. Please refer to the schematic in Page 8. To implement it,
1. Remove R67, R69 and R70.
2. Populate R68, R71 with 0Ω.
3. Set RFB3 5~10% higher than RFB1 and set RFB4 = RFB2.
4. Choose the current reference divider R65 and R66 so that when the Vout is regulated, the voltage drop on R65 is equal to VILIM, where VILIM is the output current limit threshold voltage. For example, when ILIM pin is grounded, VILIM = 50mV. For VOUT = 12V, select R65 = 100Ω and R66 = 24kΩ and then the voltage drop on R65 will be 50mV.
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DEMO MANUAL DC2253A
Figure 2. Measuring Output Voltage Ripple
Quick start proceDure
Figure 1. Proper Measurement Equipment Setup
+ –
VOUT GND
COUT
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DEMO MANUAL DC2253A
Quick start proceDure
Figure 3. Efficiency vs Load Current (VOUT = 12V, CCM) Figure 4. Output Current Sharing (VIN = 6V, VOUT = 12V)
LOAD CURRENT (A)0
80
EFFI
CIEN
CY (%
)
82
84
86
88
90
96
100
98
92
94
5 10 15 20 25 30
DC2253A F03
36VIN12VIN6VIN
TOTAL OUTPUT CURRENT (A)0
0
PHAS
E OU
TPUT
CUR
RENT
(A)
2
4
10
14
12
6
8
5 10 15 20 25
DC2253A F04
±2%
Figure 5. Output Current Sharing (VIN = 12V, VOUT = 12V) Figure 6. Output Current Sharing (VIN = 36V, VOUT = 12V)
TOTAL OUTPUT CURRENT (A)0
0
PHAS
E OU
TPUT
CUR
RENT
(A)
2
4
10
14
12
6
8
5 10 15 20 25
DC2253A F05
±1.4%
TOTAL OUTPUT CURRENT (A)0
0
PHAS
E OU
TPUT
CUR
RENT
(A)
2
4
10
14
12
6
8
5 10 15 20 25
DC2253A F06
±3.7%
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DEMO MANUAL DC2253A
Quick start proceDure
Figure 7. Thermal Performance (VIN = 12V, VOUT = 12V, 25A Load, No Air Flow)
Figure 8. Thermal Performance (VIN = 6V, VOUT = 12V, 25A Load, 200LFM)
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DEMO MANUAL DC2253A
Quick start proceDure
Figure 9. Thermal Performance (VIN = 36V, VOUT = 12V, 25A Load, 200LFM)
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DEMO MANUAL DC2253A
parts ListITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 2 CC1, CC4 CAP., C0G, 100pF, 50V, 10% 0603 AVX, 06035A101KAT2A
2 2 CC2, CC3 CAP., X7R, 0.01µF, 50V, 10% 0603 AVX, 06035C103KAT2A
3 5 CSS1, C15, C39, C61, CSS CAP., X7R, 0.1µF, 50V, 10% 0603 AVX, 06035C104KAT2A
4 0 CF1, CF2, CF3, C7, C8, CF, C23 CAP., 0603 OPTIONAL
5 C29, C30, C31-C34
6 C12, C13, C59, C60 CAP., 1206 OPTIONAL
7 C14, C35, C36, C41, C46-C50 CAP., 1210 OPTIONAL
8 4 C62, C63, C66, C67 CAP., X7R, 2.2µF, 50V, 10% 1206 KEMET C1206C225K5RACTU
9 4 C64, C65, C68, C69 CAP., X7R, 2.2µF, 25V, 10% 1206 AVX 12063C225KAT2A
10 2 C11, C51 CAP., NPO, 68pF, 50V, 10% 0603 AVX, 06035A680KAT2A
11 2 C10, C38 CAP., X5R, 4.7µF, 10V, 10% 0603 AVX, 0603ZD475KAT2A
12 2 C24, C55 CAP., X7R, 1µF, 16V, 20% 0603 AVX, 0603YC105MAT2A
13 4 CIN1, CIN2, CIN3, CIN4 CAP., ALUM, 270µF, 50V, 20% SUN ELECTRONICS, 50ME270WX+T
14 4 COUT1, COUT2, COUT3, COUT4 CAP., OS-CON, 330µF, 25V, 20% SANYO, 25SEPF330M
15 12 C16, C17, C19, C20, C21, C28 CAP., X7R, 22µF, 16V, 20% 1210 AVX, 1210YC226MAT2A
16 C40, C42, C43, C44, C53, C58
17 4 C4, C5, C22, C52 CAP., X7R, 0.22µF, 16V, 20% 0603 AVX, 0603YC224MAT2A
18 8 C9, C25, C26, C27 CAP., X7R, 3.3µF, 50V, 20% 1210 AVX, 12105C335MAT2A
19 C37, C45, C54, C56
20 2 C18, C57 CAP., X5R, 10µF, 6.3V, 20% 1206 AVX, 12066D106MAT2A
21 4 D4, D7, D12, D13 DIODE, SCHOTTKY 1A 60V POWERDI123 DIODE INC., DFLS160-7
22 4 D5, D6, D10, D11 DIODE, SCHOTTKY 3A 40V SMA DIODE INC., B340A-13-F
23 1 D8 DIODE, ZENER 5.1V 350MW SOT23-3 DIODE INC., BZX84C5V1-7-F
24 1 JP1 HEADER, 3 PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S
25 1 XJP1 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G
26 4 J2, J4, J5, J6 STUD, TESTPIN PEM KFH-032-10
27 8 J1, J2, J3, J4 (x2) NUT, BRASS 10-32 ANY #10-32
28 4 J1, J2, J3, J4 RING, LUG #10 KEYSTONE, 8205, #10
29 4 J1, J2, J3, J4 WASHER, TIN PLATED BRASS ANY #10, #10EXT BZ TN
30 2 L1, L2 INDUCTOR, 3µH COILCRAFT LNC. XAL1580-302ME
31 6 Q2, Q4, Q6, Q16, Q17, Q12 MOSFET N-CHANNEL INFINEON, BSC027N04LS
32 6 Q3, Q5, Q10, Q15, Q9, Q14 MOSFET N-CHANNEL INFINEON, BSC010NE2LS
33 0 Q7, Q8, Q11, Q13 OPT
34 1 RFB1 RES., CHIP., 113k, 0.1W, 1% 0603 YAGEO, RC0603FR-07113KL
35 1 RFB2 RES., CHIP., 8.06k, 0.1W, 1% 0603 YAGEO, RC0603FR-078K06L
36 4 R18, R32, R35, R64 RES., CHIP., 0.006Ω, 2W, 1% 2512 SUSUMU., KRL3264E-C-R006
37 2 R2, R59 Sense RES 0.003Ω 1W 1% 2512 SMD YAGEO, PR2512FKF070R003L
38 12 R3, R4, R9, R10, R13, R14, R36 RES., CHIP., 100Ω, 0.1W, 1% 0603 YAGEO, RC0603FR-07100RL
39 R37, R40, R41, R53, R54
40 2 R5, R58 RES., CHIP, 5.1Ω, 0.1W, 5% 0805 YAGEO, RC0805JR-075R1L
41 0 R6, R12, R15, R22, R28, R29, R38, R39 RES., 0603, OPTIONAL
42 R63, R68, R71, R74, R75, R65, R66, R73
8dc2253af
DEMO MANUAL DC2253A
parts ListITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
43 RFB3, RFB4
44 R28, R29, R60, R61 RES., 1206, OPTIONAL
45 2 R7, R50 RES., CHIP., 100k, 0.1W, 1% 0603 YAGEO, RC0603FR-07100KL
46 1 R8 RES., CHIP., 10Ω, 0.1W, 5% 0603 YAGEO, RC0603JR-0710RL
47 2 R26, R55 RES., CHIP., 10Ω, 0.1W, 5% 0805 YAGEO, RC0805JR-0710RL
48 17 R1, R11, R17, R23, R25 RES., CHIP., 0Ω 1% 0603 YAGEO, RC0603FR-070RL
49 R27, R43, R46, R48, R51, R76
50 R57, R62, R67, R69, R70, R72
51 1 R20, R33 RES., CHIP., 0Ω 2512 TEPRO, RN5326
52 2 R16, R45 RES., CHIP., 1k, 0.1W, 1% 0603 YAGEO, RC0603FR-071KL
53 6 RC1, R21, R24, R34, R44, RC RES., CHIP., 10k, 0.1W, 1% 0603 YAGEO, RC0603FR-0710KL
54 1 R30 RES., CHIP., 41.2k, 0.1W, 1% 0603 YAGEO, RC0603FR-0741K2L
55 1 R31 RES., CHIP., 12.1k, 0.1W, 1% 0603 YAGEO, RC0603FR-0712K1L
56 1 R56 RES., CHIP., 499k, 0.1W, 1% 0603 YAGEO, RC0603FR-07499KL
57 5 TP1, TP2, TP3, TP7, TP20 TESTPOINT, TURRET, .061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0
58 6 TP4, TP5, TP6, TP10-TP12 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0
59 2 U1, U2 I.C.,LTC3789EGN SSOP N LINEAR TECH., LTC3789EGN#PBF
60 1 U3 I.C.,LTC6908CDCB-1 2mm × 3mm LINEAR TECH., LTC6908CDCB-1
61 4 MTGS AT 4 CORNERS STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON)
62 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT FT228A
63 2 STENCILS STENCIL BOTH SIDES STENCIL FT228A
9dc2253af
DEMO MANUAL DC2253A
schematic Diagram5 5
4 4
3 3
2 2
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R7
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R9
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R9
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3.3u
F50
V
1210
C35
3.3u
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V
1210
C11 68pF
C11 68pF
+
CIN
127
0uF
50V+
CIN
127
0uF
50V
C19
22uF
16V
C19
22uF
16V
D5
B34
0AD
5B
340A
D8
BZX
84C
5V1
D8
BZX
84C
5V1
RFB
28.
06K
RFB
28.
06K
Q9
BS
C01
0NE
2LS
Q9
BS
C01
0NE
2LS
G
D S
C65
2.2u
F
50V
1206
C65
2.2u
F
50V
1206
C27
C27
R2
0.00
3
1W
R2
0.00
3
1W
TP3
VIN
1+TP
3V
IN1+
Q8
BS
C01
0NE
2LS
Q8
BS
C01
0NE
2LS
G
D S
R24
10K
R24
10K
R18
0.00
62WR18
0.00
62W
+
CIN
227
0uF
50V+
CIN
227
0uF
50V
L13u
HL1
3uH
R12
OP
TR
12O
PT
J2G
ND
J2G
ND
C16
22uF
16V
C16
22uF
16V
Q3
Q3 G
D S
C26
C26
C32
C32
TP5
SS
TP5
SS
C20
22uF
16V
C20
22uF
16V
R23
0R
230
R21
10K
R21
10K
R30
41.2
K
R30
41.2
K
J3V
OU
T
12V
@ 2
5A M
AX
J3V
OU
T
12V
@ 2
5A M
AX
C12
(OP
T)12
06
C12
(OP
T)12
06
C14
3.3u
F50
V
1210
C14
3.3u
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V
1210
Q5
Q5
G
D S
TP11
SG
ND
TP11
SG
ND
R3
100
R3
100
C63
2.2u
F50
V12
06
C63
2.2u
F50
V12
06
TP2
VO
S+
TP2
VO
S+
C28
22uF
16V
1210
C28
22uF
16V
1210
C9
3.3u
F
C9
3.3u
F
C8
OP
TC
8O
PT
CC
110
0pF
CC
110
0pF
R66
(OP
T)R
66(O
PT)
R22
OP
TR
22O
PT
C15
0.1u
F50
V
C15
0.1u
F50
V
TP4
PG
OO
D1
TP4
PG
OO
D1
C21
22uF
16V
C21
22uF
16V
C25
50V
1210
C25
50V
1210
CF
OP
TC
FO
PT
R20
0R
200
C62
2.2u
F50
V12
06
C62
2.2u
F50
V12
06
C64
C64
Q4
Q4
G
D S
Q7
BS
C02
7N04
LSQ
7B
SC
027N
04LS
R13
100
R13
100
C30
C30
U1
LTC
3789
EG
NU
1LT
C37
89E
GN
VFB
1
SS2
SEN
SE1+
3
SEN
SE1-
4
ITH
5
SGN
D6
MO
DE/
PLLI
N7
FREQ
8
RU
N9
VIN
SNS
10
VOU
TSN
S11
ILIM
12
IOSE
NSE
+13
IOSE
NSE
-14
TRIM
15
SW2
16
TG2
17
BOO
ST2
18
BG2
19
EXTV
CC
20
INTV
CC
21
VIN
22
PGN
D24
BOO
ST1
25
SW1
27
PGO
OD
28
TG1
26
BG1
23
+C
OU
T233
0uF
25V
+C
OU
T233
0uF
25V
RFB
111
3KR
FB1
113K
C24
1uF
C24
1uF
J4G
ND
J4G
ND
R4
100
R4
100
TP1
VO
S-
TP1
VO
S-
R31
12.1
KR
3112
.1K
TP10
PLL
IN1
TP10
PLL
IN1
D4
DFL
S16
0D
4D
FLS
160
10dc2253af
DEMO MANUAL DC2253A
schematic Diagram5 5
4 4
3 3
2 2
1 1
DD
CC
BB
AA
XA
L158
0-30
2ME
(OP
T)
16V
2512
6.3V
2. IN
STAL
L SHU
NTS
AS S
HOW
N.
NOTE
: UNL
ESS
OTHE
RWIS
E SP
ECIF
IED
1. A
LL R
ESIS
TORS
ARE
IN O
HMS,
0603
.
ALL
CAP
ACITO
RS A
RE IN
MIC
ROFA
RADS
, 060
3.
(OP
T)
0805
(OP
T)
(OP
T)
(OP
T)
0805
VO
UT2
VIN
2+
VO
UT
INTV
CC
2
INTV
CC
2
VO
UT
VO
UT
INTV
CC
2
INTV
CC
2
VIN
2+V
OS
+
VIN
SS
ITH
1
VFB
1
PLL
IN2
IRE
F1
Run
EX
TVC
C
REVI
SION
HIS
TORY
DESC
RIPT
ION
DATE
APPR
OVED
ECO
REV
CHAR
LIE
Z.PR
ODUC
TION
26-
9-11
__
REVI
SION
HIS
TORY
DESC
RIPT
ION
DATE
APPR
OVED
ECO
REV
CHAR
LIE
Z.PR
ODUC
TION
26-
9-11
__
REVI
SION
HIS
TORY
DESC
RIPT
ION
DATE
APPR
OVED
ECO
REV
CHAR
LIE
Z.PR
ODUC
TION
26-
9-11
__
SIZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
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CUST
OMER
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ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
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BES
T EF
FORT
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GN A
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MEE
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SUPP
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ONS;
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MAT
IC
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LIED
FOR
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ALE
= NO
NE
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esda
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H EF
FICI
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2-PH
ASE
BUCK
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ST C
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N/A
LTC3
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GNDE
MO C
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SIZE
DATE
:
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O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
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)434
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Milp
itas,
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035
Phon
e: (4
08)4
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900
1630
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arth
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.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
DESI
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CIRC
UIT
THAT
MEE
TS C
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MER-
SUPP
LIED
SPE
CIFI
CATI
ONS;
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, IT R
EMAI
NS T
HE C
USTO
MER'
S RE
SPON
SIBI
LITY
TO
VERI
FY P
ROPE
R AN
D RE
LIAB
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PERA
TION
IN T
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CTUA
LAP
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ATIO
N. C
OMPO
NENT
SUB
STIT
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N AN
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INTE
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LAYO
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CHNO
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APP
LICA
TION
S EN
GINE
ERIN
G FO
R AS
SIST
ANCE
.
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
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HIG
H EF
FICI
ENCY
2-PH
ASE
BUCK
-BOO
ST C
ONVE
RTER
HZ Jeof
frey W
.
N/A
LTC3
789E
GNDE
MO C
IRCU
IT 22
53A
SIZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
DESI
GN A
CIRC
UIT
THAT
MEE
TS C
USTO
MER-
SUPP
LIED
SPE
CIFI
CATI
ONS;
HOW
EVER
, IT R
EMAI
NS T
HE C
USTO
MER'
S RE
SPON
SIBI
LITY
TO
VERI
FY P
ROPE
R AN
D RE
LIAB
LE O
PERA
TION
IN T
HE A
CTUA
LAP
PLIC
ATIO
N. C
OMPO
NENT
SUB
STIT
UTIO
N AN
D PR
INTE
DCI
RCUI
T BO
ARD
LAYO
UT M
AY S
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FICA
NTLY
AFF
ECT
CIRC
UIT
PERF
ORMA
NCE
OR R
ELIA
BILI
TY. C
ONTA
CT L
INEA
RTE
CHNO
LOGY
APP
LICA
TION
S EN
GINE
ERIN
G FO
R AS
SIST
ANCE
.
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
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r.com 1
Wedn
esda
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ptemb
er 03
, 201
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HIG
H EF
FICI
ENCY
2-PH
ASE
BUCK
-BOO
ST C
ONVE
RTER
HZ Jeof
frey W
.
N/A
LTC3
789E
GNDE
MO C
IRCU
IT 22
53A
C66
2.2u
F50
V12
06
C66
2.2u
F50
V12
06
C59
(OP
T)C
59(O
PT)
R69 0R69 0
R58
5.1
R58
5.1
CF2
OP
TC
F2O
PT
R74
OP
TR
74O
PT
C41
3.3u
F50
V
1210
C41
3.3u
F50
V
1210
+C
OU
T333
0uF
16V
+C
OU
T333
0uF
16V
R54
100
R54
100
C5
0.22
uF16
V
C5
0.22
uF16
V
C43
22uF
16V
C43
22uF
16V
R51
0R
510
R62 0R62 0
R71
OP
TR
71O
PT
R43
0R
430
C51 68pF
C51 68pF
Q16
BS
C02
7N04
LS
Q16
BS
C02
7N04
LS G
D SR
39O
PT
R39
OP
T
C55
1uF
C55
1uF
Q10
Q10 G
D S
R70 0
R70 0
CC
3
0.01
uF
CC
3
0.01
uF
C42
22uF
16V
C42
22uF
16V
Q13
BS
C02
7N04
LSQ
13B
SC
027N
04LS
C34
OP
TC
34O
PT
R44
10K
R44
10K
R53
100
R53
100
RFB
3(O
PT)
RFB
3(O
PT)
C36
3.3u
F50
V
1210
C36
3.3u
F50
V
1210
R46
0R
460
U2
LTC
3789
EG
NU
2LT
C37
89E
GN
VFB
1
SS2
SEN
SE1+
3
SEN
SE1-
4
ITH
5
SGN
D6
MO
DE/
PLLI
N7
FREQ
8
RU
N9
VIN
SNS
10
VOU
TSN
S11
ILIM
12
IOSE
NSE
+13
IOSE
NSE
-14
TRIM
15
SW2
16
TG2
17
BOO
ST2
18
BG2
19
EXTV
CC
20
INTV
CC
21
VIN
22
PGN
D24
BOO
ST1
25
SW1
27
PGO
OD
28
TG1
26
BG1
23
R41
100
R41
100
Q12
Q12
G
D S
R50
100K
R50
100K
R35
0.00
62WR35
0.00
62W
R60
(OP
T)R
60(O
PT)
C60
(OP
T)12
06
C60
(OP
T)12
06
R45
1KR
451K
CC
410
0pF
CC
410
0pF
R59
0.00
3
1W
R59
0.00
3
1W
R48
0R
480
R57
0R
570
R38
OP
TR
38O
PT
C67
2.2u
F50
V12
06
C67
2.2u
F50
V12
06
CS
S1
0.1u
FC
SS
10.
1uF
C50
C50
R55
10R
5510
C57
10uF
C57
10uF
R34
10K
R34
10K
R36
100
R36
100
C37
3.3u
F
C37
3.3u
F
RC
1
10K
RC
1
10K
C40
22uF
16V
C40
22uF
16V
R68
OP
TR
68O
PT
+C
IN4
270u
F50
V
+C
IN4
270u
F50
V
CF3
OP
TC
F3O
PT
R76
0R
760
C54
C54
TP20
VIN
2+TP
20V
IN2+
D13
DFL
S16
0D
13D
FLS
160
D11
B34
0AD
11B
340A
Q15
Q15
G
D S
C69
C69
C45
C45
R67
0R67
0
+C
IN3
270u
F50
V
+C
IN3
270u
F50
V
C38
4.7u
FC
384.
7uF
R63
OP
TR
63O
PT
C47
C47
C53
22uF
16V
1210
C53
22uF
16V
1210
R61
(OP
T)12
06
R61
(OP
T)12
06
D12
DFL
S16
0D
12D
FLS
160
D10
B34
0AD
10B
340A
R33
0R
330
C33
OP
TC
33O
PT
C49
C49
C56
50V
1210
C56
50V
1210 Q
14
BS
C01
0NE
2LS
Q14
BS
C01
0NE
2LS
G
D S
C52
0.22
uF16
V
C52
0.22
uF16
V
C58
22uF
16V
C58
22uF
16V
RFB
4(O
PT)
RFB
4(O
PT)
R40
100
R40
100
C39
0.1u
F50
V
C39
0.1u
F50
VC
48C
48
R64
0.00
62WR
640.
006
2W
R73
(OP
T)R
73(O
PT)
C46
1210
C46
1210
R72
0R72
0
C44
22uF
16V
C44
22uF
16V
C68
2.2u
F50
V12
06
C68
2.2u
F50
V12
06
Q17
Q17 G
D S
Q11
BS
C01
0NE
2LS
Q11
BS
C01
0NE
2LS
G
D S
L23u
HL2
3uH
+C
OU
T433
0uF
16V
+C
OU
T433
0uF
16V
R37
100
R37
100
11dc2253af
DEMO MANUAL DC2253A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram5 5
4 4
3 3
2 2
1 1
DD
CC
BB
AA
INTV
CC
1
PLL
IN2
PLL
IN1
SIZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
DESI
GN A
CIRC
UIT
THAT
MEE
TS C
USTO
MER-
SUPP
LIED
SPE
CIFI
CATI
ONS;
HOW
EVER
, IT R
EMAI
NS T
HE C
USTO
MER'
S RE
SPON
SIBI
LITY
TO
VERI
FY P
ROPE
R AN
D RE
LIAB
LE O
PERA
TION
IN T
HE A
CTUA
LAP
PLIC
ATIO
N. C
OMPO
NENT
SUB
STIT
UTIO
N AN
D PR
INTE
DCI
RCUI
T BO
ARD
LAYO
UT M
AY S
IGNI
FICA
NTLY
AFF
ECT
CIRC
UIT
PERF
ORMA
NCE
OR R
ELIA
BILI
TY. C
ONTA
CT L
INEA
RTE
CHNO
LOGY
APP
LICA
TION
S EN
GINE
ERIN
G FO
R AS
SIST
ANCE
.
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
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day,
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6, 20
143
3
HIG
H EF
FICI
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2-PH
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035
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143
3
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Fax:
(408
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-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
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.
LTC
Conf
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www.
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Tues
day,
May 0
6, 20
143
3
HIG
H EF
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BUCK
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ST C
ONVE
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C61
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LTC
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C69
08C
DC
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GND 7
12dc2253af
DEMO MANUAL DC2253A
Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2014
LT 1014 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation