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FEATURES

DCY (SOT-223) PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

KTE PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

KC (TO-220) PACKAGE

(TOP VIEW)

OUTPUT

INPUT

ADJUST

KTT (TO-263) PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

OUTPUT

INPUT

ADJUST

KCS (TO-220) PACKAGE

(TOP VIEW)

DESCRIPTION/ORDERING INFORMATION

LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044R – SEPTEMBER 1997 – REVISED APRIL 2007

• Output Voltage Range Adjustable From 1.25 V

• Thermal Overload Protection

to 37 V

• Output Safe-Area Compensation

• Output Current Greater Than 1.5 A

• Internal Short-Circuit Current Limiting

The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over

an output-voltage range of 1.25 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.

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.

ORDERABLE PART NUMBER

TOP-SIDE MARKING

PowerFLEX™ – KTE

Reel of 2000

LM317KTER

LM317

Tube of 80

LM317DCY

SOT-223 – DCY

L3

Reel of 2500

LM317DCYR

0

°C to 125°C

TO-220 – KC

Tube of 50

LM317KC

LM317

TO-220, short shoulder – KCS

Tube of 20

LM317KCS

TO-263 – KTT

Reel of 500

LM317KTTR

LM317

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

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.

PowerFLEX, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 1997–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.