LM317
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
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Output Voltage Range Adjustable From
1.2 V to 37 V
Output Current Greater Than 1.5 A
Internal Short-Circuit Current Limiting
Thermal Overload Protection
Output Safe-Area Compensation
Package Options Include Plastic
Small-Outline Transistor SOT-223 (DCY),
Flange Mounted (KTE) and Heat-Sink
Mounted (KC) Packages
KC PACKAGE
(TOP VIEW)
INPUT
OUTPUT
ADJUST
The OUTPUT terminal is in electrical
contact with the mounting base.
TO-220AB
IO
A
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.
KTE PACKAGE
(TOP VIEW)
INPUT
OUTPUT
ADJUST
The OUTPUT terminal is in electrical
contact with the mounting base.
I
O
A
DCY PACKAGE
(TOP VIEW)
INPUT
OUTPUT
ADJUST
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.
Copyright
2001, Texas Instruments Incorporated
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.
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