Product details


Output options Adjustable Output Iout (Max) (A) 1.5 Vin (Max) (V) 40 Vin (Min) (V) 3 Vout (Max) (V) 37 Vout (Min) (V) 1.25 Noise (uVrms) 38 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 24 Load capacitance (Min) (µF) 0 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 5 PSRR @ 100 KHz (dB) 38 Dropout voltage (Vdo) (Typ) (mV) 2000 Operating temperature range (C) 0 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

SOT-223 (DCY) 4 46 mm² 6.5 x 7 TO-220 (KCS) 3 88 mm² 10.15 x 15.4 TO-220 (KCT) 3 87 mm² 10.2 x 8.6 TO-263 (KTT) 3 155 mm² 10.16 x 15.24 open-in-new Find other Linear regulators (LDO)


  • Output voltage range adjustable
    from 1.25 V to 37 V
  • Output current greater than 1.5 A
  • Internal short-circuit current limiting
  • Thermal overload protection
  • Output safe-area compensation
open-in-new Find other Linear regulators (LDO)


The LM317 device 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 requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even if the ADJUST terminal is disconnected.

open-in-new Find other Linear regulators (LDO)
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Technical documentation

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Type Title Date
* Data sheet LM317 3-Terminal Adjustable Regulator datasheet (Rev. Y) Apr. 29, 2020
Technical article What’s not in the power MOSFET data sheet part 2: voltage-dependent leakage currents Jul. 23, 2021
Application note LDO Noise Demystified (Rev. B) Aug. 18, 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Application note Accurate Thermal Calculations on the Back of a Napkin Jun. 03, 2019
Application note Fundamental Theory of PMOS LDO Voltage Regulators (Rev. A) Aug. 17, 2018
Technical article LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical article LDO Basics: Preventing reverse current Jul. 25, 2018
Technical article LDO basics: introduction to quiescent current Jun. 20, 2018
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) Mar. 21, 2018
Application note LDO PSRR Measurement Simplified (Rev. A) Aug. 09, 2017
Application note A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes Jun. 15, 2015
Application note Linear power for automated industrial systems Jan. 09, 2015
Application note Techniques for accurate PSRR measurements Oct. 28, 2013
Application note AB-12 Wide Adjustable Range PNP Voltage Regulator (Rev. B) May 06, 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) May 06, 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application note AN-42 IC Provides On-Card Regulation for Logic Circuits (Rev. B) May 06, 2013
Application note AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) May 05, 2013
Application note AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) May 05, 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
Application note AN-1482 LDO Regulator Stability Using Ceramic Output Capacitors (Rev. A) Apr. 25, 2013
Application note AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) Apr. 23, 2013
Application note High-Efficiency Reg has Low Drop-Out Voltage (Rev. B) Apr. 23, 2013
Application note AN-1950 Silently Powering Low Noise Applications (Rev. A) Apr. 22, 2013
Application note LDO Performance Near Dropout Oct. 08, 2010
Application note Linear and Switching Voltage Regulator Fundamental Part 1 Mar. 21, 2007
Application note A New Production Technique for Trimming Voltage Regulators Oct. 03, 2002
Application note Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems Oct. 03, 2002
Application note High Stability Regulators Oct. 03, 2002

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The LM317A-337N-EVM demonstrates canonical application of the LM317A adjustable regulator and its negative complement, the LM337-N. The evaluation module (EVM) is assesmbled with the SOT-223 package option for each device, supplying up to 1 A of load current. The EVM is designed for easy (...)

  • Output adjustable from 1.2 V to 37 V for LM317A and –1.2 V to –37 V for LM337-N
  • 1-A load current with 1.5-A option
  • Heat sink space provided for TO-220
  • Large capacitor footprint space for customer selection

Design tools & simulation

SBVM440.ZIP (34 KB) - PSpice Model
SBVM441.ZIP (8 KB) - TINA-TI Spice Model
SBVM442.TSC (606 KB) - TINA-TI Reference Design
SLVMC40.ZIP (1 KB) - PSpice Model

Reference designs

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400V Input, 50W Output Multiple-Output Bias Supply Reference Design
PMP20396 — PMP20396 is a multiple-output isolated bias supply reference design. With 100V or above input voltage, this design can provide maximum 2W output power. With 300V or above input voltage, this design can provide maximum 50W output power. Four different outputs are provided in this design - 5V/500mA (...)
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Primary-Side Regulated Flyback w/85-265VAC Input High Output Energy Storage Reference Design
PMP8930 — The PMP8930 reference design uses the UCC28710 primary-side regulated flyback controller to generate a 20V output from a univeral AC input. a bulk capacitor with slow-charge-fast-discharge circuit is placed at flyback output to provide long hold up time for the following step-down DC-DC stages (...)

CAD/CAE symbols

Package Pins Download
DDPAK/TO-263 (KTT) 3 View options
SOT-223 (DCY) 4 View options
TO-220 (KCS) 3 View options
TO-220 (KCT) 3 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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