LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

1

POST OFFICE BOX 655303

1.2 V to 37 V

Small-Outline Transistor SOT-223 (DCY),

Flange Mounted (KTE) and Heat-Sink

Mounted (KC) Packages

description

The LM317 is an adjustable three-terminal

positive-voltage regulator capable of supplying

more than 1.5 A over an output-voltage range of

1.2 V to 37 V. It is exceptionally easy to use and

requires only two external resistors to set the

output voltage. Furthermore, both line and load

regulation

are

better

than

standard

fixed

regulators. The LM317 is packaged in the KC

(TO-220AB) and KTE packages, which are easy

to handle and use.

In addition to having higher performance than

fixed regulators, this device includes on-chip

current limiting, thermal overload protection, and

safe-operating-area

protection.

All

overload

protection remains fully functional, even if the

ADJUST terminal is disconnected.

The LM317 is versatile in its applications,

including uses in programmable output regulation

and local on-card regulation. Or, by connecting a

fixed resistor between the ADJUST and OUTPUT

terminals, the LM317 can function as a precision

current regulator. An optional output capacitor can

be added to improve transient response. The

ADJUST terminal can be bypassed to achieve

very high ripple-rejection ratios, which are difficult

to

achieve

with

standard

three-terminal

regulators.

The LM317 is characterized for operation over the

virtual junction temperature range of 0

°C to

125

°C.

The OUTPUT terminal is in electrical

contact with the mounting base.

TO-220AB

INPUT

OUTPUT

ADJUST

KC PACKAGE

(TOP VIEW)

KTE PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

The OUTPUT terminal is in electrical

contact with the mounting base.

I

O

A

I O

A

DCY PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

Copyright

 2001, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.