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2001 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.0

Features

Output current in excess of 1.5A

Output voltage adjustable between -1.2V and - 37V

Internal thermal overload protection

Internal short circuit current limiting

Output transistor safe area compensation

Floating operation for high voltage applications

Standard 3-pin TO-220 package

Description

The LM337 is a 3-terminal negative adjustable regulator. It

supplies in excess of 1.5A over an output voltage range of

-1.2V to - 37V. This regulator requires only two external

resistor to set the output voltage. Included on the chip are

current limiting, thermal overload protection and safe area

compensation.

TO-220

1. Adj 2. Input 3. Output

1

Internal Block Diagram

1

VoltageReference

-

+

2

Protection

Circuitry

3 Output

Input

Vadj

LM3373-Ter m inal 1 .5A Negat ive Adjust ab le Regulat or

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Absolute Maximum Ratings

Electrical Characteristics

(VI - VO = 5V, IO = 40mA, 0C TJ +125C, PDMAX = 20W, unless otherwise specified)

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into

account separately. Pulse testing with low duty is used.2. CADJ, when used, is connected detween the adjustment pin and ground.

Parameter Symbol Value Unit

Input-Output Voltage Differential |VI - VO| 40 V

Power Dissipation PD Internally limited W

Operating Temperature Range TOPR 0 ~ +125 C

Storage Temperature Range TSTG -65 ~+125 C

Parameter Symbol Conditions Min Typ. Max. Unit

Line Regulation (Note1) Rline

TA = +25C3V IVI - VO I 40V

- 0.01 0.04%/ V

3V IVI - VO I 40V - 0.02 0.07Load Regulation (Note1) Rload

TA = +25C10mA IO 0.5A

- 15 50mV

10mA IO 1.5A - 15 150

Adjustable Pin Current IADJ - - 50 100 A

Adjustable Pin Current Change IADJ

TA =+ 25C10mA IO 1.5A3V IVI - VO I 40V

- 2 5 A

TA =+ 25C -1.213 -1.250 -1.287

Reference Voltage VREF 3V IVI - VO I 40V10mA IO 1.5A

-1.200 -1.250 -1.300 V

Temperature Stability STT 0C J +125C - 0.6 - %

Minimum Load Current to MaintainRegulation IL(MIN)

3V IVI - VO I 40V - 2.5 10

3V IVI - VO I 10V - 1.5 6 mA

Output Noise eN TA =+25C 10Hz f 10KHz - 0.003 - V/106

Ripple Rejection Ratio RRVO = -10V, f = 120Hz - 60 -

CADJ = 10F (Note2) 66 77 - dB

Long Term Stability ST TJ = 125C ,1000Hours - 0.3 1 %

Thermal Resistance Junction toCase

RJC - - 4 - C/ W

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Typical Application

Figure 1. Programmable Regulator

Ci is required if regulator is located more then 4 inches from power supply filter.

A 1.0F solid tantalum or 10F aluminum electrolytic is recommended.

Co is necessary for stability. A 1.0F solid tantalum or 10F aluminum electrolytic is recommended. VO= -1.25V (1+R2/R1)

-VI KA337

Ci0. 1F

VI Vo

Vadj

R2

IadjR1

IPROG

Co

1F

-Vo

+ +

LM337

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Mechanical Dimensions

Package

4.50 0.209.90 0.20

1.52 0.10

0.80 0.102.40 0.20

10.00 0.20

1.27 0.10

3.60 0.10

(8.70)

2.8

00.

10

15.9

00.

20

10.080.

30

18.9

5MAX

.

(1.7

0)

(3.7

0)

(3.0

0)

(1.4

6)

(1.0

0)

(45)

9.2

00.

20

13.0

80.

20

1.3

00.

10

1.30+0.10

0.05

0.50+0.10

0.05

2.54TYP

[2.54 0.20]

2.54TYP

[2.54 0.20]

TO-220

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Ordering Information

Product Number Package Operating Temperature

LM337T TO-220 0C to + 125C

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6/1/01 0.0m 001Stock#DSxxxxxxxx

2001 Fairchild Semiconductor Corporation

LIFE SUPPORT POLICYFAIRCHILDS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICESOR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTORCORPORATION. As used herein:

1. Life support devices or systems are devices or systemswhich, (a) are intended for surgical implant into the body,or (b) support or sustain life, and (c) whose failure toperform when properly used in accordance withinstructions for use provided in the labeling, can bereasonably expected to result in a significant injury of theuser.

2. A critical component in any component of a life supportdevice or system whose failure to perform can bereasonably expected to cause the failure of the life supportdevice or system, or to affect its safety or effectiveness.

www.fairchildsemi.com

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANYPRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANYLIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHERDOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

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