3-TERMINAL ADJUSTABLE REGULATOR
www.ti.com
SLVS044R – SEPTEMBER 1997 – REVISED APRIL 2007
FEATURES
•
•
•
Output Voltage Range Adjustable From 1.25 V
to 37 V
Output Current Greater Than 1.5 A
Internal Short-Circuit Current Limiting
DCY (SOT-223) PACKAGE
(TOP VIEW)
•
•
Thermal Overload Protection
Output Safe-Area Compensation
KC (TO-220) PACKAGE
(TOP VIEW)
KCS (TO-220) PACKAGE
(TOP VIEW)
OUTPUT
INPUT
OUTPUT
ADJUST
OUTPUT
OUTPUT
INPUT
OUTPUT
ADJUST
INPUT
OUTPUT
ADJUST
KTE PACKAGE
(TOP VIEW)
KTT (TO-263) PACKAGE
(TOP VIEW)
OUTPUT
INPUT
OUTPUT
ADJUST
INPUT
OUTPUT
ADJUST
DESCRIPTION/ORDERING INFORMATION
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.
ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
PowerFLEX™ – KTE
SOT-223 – DCY
0°C to 125°C
TO-220 – KC
TO-220, short shoulder – KCS
TO-263 – KTT
(1)
(2)
Reel of 2000
Tube of 80
Reel of 2500
Tube of 50
Tube of 20
Reel of 500
ORDERABLE PART NUMBER
LM317KTER
LM317DCY
LM317DCYR
LM317KC
LM317KCS
LM317KTTR
TOP-SIDE MARKING
LM317
L3
LM317
LM317
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
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1997–2007, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
