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Linear & low-dropout (LDO) regulators

LM317

ACTIVE

1.5-A, 40-V, adjustable linear voltage regulator

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Data sheet

LM317

ACTIVE
Data sheet Order now

Product details

Output options Adjustable Output, Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 40 Vin (min) (V) 3 Vout (max) (V) 37 Vout (min) (V) 1.25 Fixed output options (V) 37 Rating Catalog Noise (µVrms) 38 PSRR at 100 KHz (dB) 38 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 24 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
Output options Adjustable Output, Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 40 Vin (min) (V) 3 Vout (max) (V) 37 Vout (min) (V) 1.25 Fixed output options (V) 37 Rating Catalog Noise (µVrms) 38 PSRR at 100 KHz (dB) 38 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 24 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
SOT-223 (DCY) 4 45.5 mm² 6.5 x 7 TO-220 (KCS) 3 46.228 mm² 10.16 x 4.55 TO-263 (KTT) 3 154.8384 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 LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017
Technical article Designing an IoT modular light PDF | HTML 17 Jun 2016
Technical article How to create power solutions: solar power PDF | HTML 19 Jan 2016
Application note Linear power for automated industrial systems 09 Jan 2015
Analog Design Journal Techniques for accurate PSRR measurements 28 Oct 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 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 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

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 (...)

User guide: PDF
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Simulation model

LM317 PSpice Transient Model

SBVM440.ZIP (34 KB) - PSpice Model
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Simulation model

LM317 TINA-TI Transient Model

SBVM441.ZIP (8 KB) - TINA-TI Spice Model
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Simulation model

LM317 TINA-TI Transient Reference Design

SBVM442.TSC (606 KB) - TINA-TI Reference Design
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Simulation model

LM317 Unencrypted PSpice Transient Model

SLVMC40.ZIP (1 KB) - PSpice Model
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Reference designs

PMP23463 — 300W thin profile LLC reference design

This reference design demonstrates a half-bridge resonant converter on a single copper layer printed circuit board (PCB) that accepts a 385V input and generates an isolated 22.5V output up to 13.5A load. This design is comprised of the UCC256603 half-bridge LLC controller and UCC24612 synchronous (...)
Test report: PDF
Reference designs

TIDM-SOLARUINV — Grid-tied Solar Micro Inverter with MPPT

This design is a digitally-controlled, grid-tied, solar micro inverter with maximum power point tracking (MPPT). Solar micro inverters are an emerging segment of the solar power industry. Rather than linking every solar panel in an installation to a central inverter, solar micro inverter-based (...)
User guide: PDF
Schematic: PDF
Reference designs

PMP20396 — 400V Input, 50W Output Multiple-Output Bias Supply Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-223 (DCY) 4 Ultra Librarian
TO-220 (KCS) 3 Ultra Librarian
TO-263 (KTT) 3 Ultra Librarian
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Ordering & quality

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