LM337M

SEMICONDUCTOR

TECHNICAL DATA

MEDIUM CURRENT

THREE–TERMINAL

ADJUSTABLE NEGATIVE

VOLTAGE REGULATOR

ORDERING INFORMATION

Order this document by LM337M/D

Pin 1. Adjust

2. Vin

3. Vout

T SUFFIX

PLASTIC PACKAGE

CASE 221A

3

1

2

Operating

Temperature Range

Device

Package

LM337MT

Plastic Power

TJ = 0° to +125°C

1

MOTOROLA ANALOG IC DEVICE DATA

Three-Terminal Adjustable

Output Negative Voltage

Regulator

The LM337M is an adjustable three–terminal negative voltage regulator

capable of supplying in excess of 500 mA over an output voltage range of

–1.2 V to –37 V. This voltage regulator is exceptionally easy to use and

requires only two external resistors to set the output voltage. Further, it

employs internal current limiting, thermal shutdown and safe area

compensation, making it essentially blow–out proof.

The LM337M serves a wide variety of applications including local,

on–card regulation. This device can also be used to make a programmable

output regulator or by connecting a fixed resistor between the adjustment

and output. The LM337M can be used as a precision current regulator.

Standard Application

IPROG

Cin *

+

1.0

µF

–Vin

Vin

LM337M

Vout

–Vout

CO **

+

IAdj

R1

120

*Cin is required if regulator is located more than 4″ from power supply filter.

µF solid tantalum or 10 µF aluminum electrolytic is recommended.

**CO is necessary for stability. A 1.0 µF solid tantalum or 10 µF aluminum

R2

1.0

µF

Adjust

Vout + –1.25 V 1 )

R2

R1

© Motorola, Inc. 1996

Rev 1