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LM317

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

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

LM317

ACTIVE
Data sheet Order now

Product details

Parameters

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 Approx. price (US$) 0.14 | 1ku 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 8.6 x 10.3 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)

Features

  • 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

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Description

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
* Datasheet LM317 3-Terminal Adjustable Regulator datasheet (Rev. Y) Apr. 29, 2020
Application notes A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Application notes Accurate Thermal Calculations on the Back of a Napkin Jun. 03, 2019
Application notes Fundamental Theory of PMOS LDO Voltage Regulators (Rev. A) Aug. 17, 2018
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Selection guides Low Dropout Regulators Quick Reference Guide (Rev. P) Mar. 21, 2018
Application notes LDO Noise Demystified (Rev. A) Aug. 09, 2017
Application notes LDO PSRR Measurement Simplified (Rev. A) Aug. 09, 2017
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Application notes A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes Jun. 15, 2015
Application notes Linear power for automated industrial systems Jan. 09, 2015
Application notes Techniques for accurate PSRR measurements Oct. 28, 2013
Application notes AB-12 Wide Adjustable Range PNP Voltage Regulator (Rev. B) May 06, 2013
Application notes AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) May 06, 2013
Application notes AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application notes AN-42 IC Provides On-Card Regulation for Logic Circuits (Rev. B) May 06, 2013
Application notes AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) May 05, 2013
Application notes AN-181 3-Terminal Regulator is Adjustable (Rev. B) May 05, 2013
Application notes AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) May 05, 2013
Application notes Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
Application notes AN-1482 LDO Regulator Stability Using Ceramic Output Capacitors (Rev. A) Apr. 25, 2013
Application notes AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) Apr. 23, 2013
Application notes High-Efficiency Reg has Low Drop-Out Voltage (Rev. B) Apr. 23, 2013
Application notes AN-1950 Silently Powering Low Noise Applications (Rev. A) Apr. 22, 2013
Application notes LDO Performance Near Dropout Oct. 08, 2010
Application notes Linear and Switching Voltage Regulator Fundamental Part 1 Mar. 21, 2007
Application notes A New Production Technique for Trimming Voltage Regulators Oct. 03, 2002
Application notes Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems Oct. 03, 2002
Application notes 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

EVALUATION BOARDS Download
document-generic User guide
$29.00
Description

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 (...)

Features
  • 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
View details

Design tools & simulation

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

Reference designs

REFERENCE DESIGNS Download
Grid-tied Solar Micro Inverter with MPPT
TIDM-SOLARUINV — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
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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Training series

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