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 Rating Catalog Load capacitance (Min) (µF) 0 Regulated outputs (#) 1 Features Accuracy (%) 5 PSRR @ 100 KHz (dB) 38 Dropout voltage (Vdo) (Typ) (mV) 2000 Operating temperature range (C) 0 to 125
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 Rating Catalog Load capacitance (Min) (µF) 0 Regulated outputs (#) 1 Features Accuracy (%) 5 PSRR @ 100 KHz (dB) 38 Dropout voltage (Vdo) (Typ) (mV) 2000 Operating temperature range (C) 0 to 125
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
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet LM317 3-Terminal Adjustable Regulator datasheet (Rev. Y) PDF | HTML 29 Apr 2020
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Application note Accurate Thermal Calculations on the Back of a Napkin 03 Jun 2019
Application note Fundamental Theory of PMOS LDO Voltage Regulators (Rev. A) 17 Aug 2018
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017
Technical article Designing an IoT modular light 17 Jun 2016
Technical article How to create power solutions: solar power 19 Jan 2016
Application note A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes 15 Jun 2015
Application note Linear power for automated industrial systems 09 Jan 2015
Analog Design Journal Techniques for accurate PSRR measurements 28 Oct 2013
Technical article Myths surrounding PSRR specifications 22 Oct 2013
Technical article It’s on – TPS54061 switching regulator vs. LM317 linear regulator 22 Aug 2013
Application note AB-12 Wide Adjustable Range PNP Voltage Regulator (Rev. B) 06 May 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 06 May 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 06 May 2013
Application note AN-42 IC Provides On-Card Regulation for Logic Circuits (Rev. B) 06 May 2013
Application note AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) 05 May 2013
Application note AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) 05 May 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 05 May 2013
Application note AN-1482 LDO Regulator Stability Using Ceramic Output Capacitors (Rev. A) 25 Apr 2013
Application note AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) 23 Apr 2013
Application note High-Efficiency Reg has Low Drop-Out Voltage (Rev. B) 23 Apr 2013
Application note AN-1950 Silently Powering Low Noise Applications (Rev. A) 22 Apr 2013
Application note LDO Performance Near Dropout 08 Oct 2010
Application note Linear and Switching Voltage Regulator Fundamental Part 1 21 Mar 2007
Application note A New Production Technique for Trimming Voltage Regulators 03 Oct 2002
Application note Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems 03 Oct 2002
Application note High Stability Regulators 03 Oct 2002

Design & development

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

Evaluation board

LM317A-337N-EVM — 3-pin adjustable regulator evaluation module

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 (...)

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Simulation model

LM317 PSpice Transient Model LM317 PSpice Transient Model

Simulation model

LM317 TINA-TI Transient Model LM317 TINA-TI Transient Model

Simulation model

LM317 TINA-TI Transient Reference Design LM317 TINA-TI Transient Reference Design

Simulation model

LM317 Unencrypted PSpice Transient Model LM317 Unencrypted PSpice Transient Model

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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. (...)
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

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