Top

Product details

Parameters

Output options Adjustable Output Iout (Max) (A) 0.5 Vin (Max) (V) 40 Vin (Min) (V) 3.75 Vout (Max) (V) 37 Vout (Min) (V) 1.2 Noise (uVrms) 38 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 60 Load capacitance (Min) (µF) 0 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 3 PSRR @ 100 KHz (dB) 22 Dropout voltage (Vdo) (Typ) (mV) 2000 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

SOT-223 (DCY) 4 46 mm² 6.5 x 7 TO-252 (KVU) 3 67 mm² 6.6 x 10.11 open-in-new Find other Linear regulators (LDO)

Features

  • Output Voltage Range Adjustable
    from 1.25-V to 37-V
  • Output Current Greater Than 500-mA
  • Internal Short-Circuit Current Limiting
  • Thermal-Overload Protection
  • Output Safe-Area Compensation
  • Q Devices Meet Automotive Performance Requirements
  • Customer-Specific Configuration Control Can Be Supported for Q Devices Along With
    Major-Change Approval
open-in-new Find other Linear regulators (LDO)

Description

The LM317M is an adjustable 3-terminal positive voltage regulator capable of supplying more than 500-mA over an output-voltage range of 1.25-V to
37-V. The LM317M is exceptionally easy to use and requires only two external resistors to set the output. Furthermore, both line and load regulation are better than standard fixed regulators.

In addition to having higher performance than fixed regulators, the LM317M includes on-chip current limiting, thermal-overload protection, and safe- operating-area protection. All overload protection remains fully functional if the ADJUST terminal is disconnected.

The LM317 is a floating regulator meaning there is no device ground terminal. Quiescent current flows to the load instead of being wasted flowing to ground. Regulated output voltage of hundreds of volts is possible if the maximum input to output differential does not exceed 40-V at any time. Device can be used as a floating current source controlled by a single resistor.

Normally, no capacitors are needed unless the device is more than six inches from the input filter capacitors, in which case an input bypass capacitor of any type is needed. An optional electrolytic or tantalum output capacitor can be added to improve transient response. Ceramic output capacitors can be used but output ringing may be present on transients. The ADJUST terminal can be bypassed with any type of capacitor to achieve high ripple-rejection ratios, which are difficult to achieve with standard three-terminal regulators.

open-in-new Find other Linear regulators (LDO)
Download
Similar products you might be interested in
open-in-new Compare products
Same functionality and pinout but is not an equivalent to the compared device:
LM317MQ ACTIVE 500-mA, 40-V, adjustable linear voltage regulator for automotive applications Pin-to-pin equivalent for automotive applications

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 19
Type Title Date
* Datasheet LM317M 3-Terminal Adjustable Regulator datasheet (Rev. P) Mar. 31, 2014
User guides MLTLDO2EVM-037 Evaluation Module User's Guide May 22, 2020
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
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 AB-12 Wide Adjustable Range PNP Voltage Regulator (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-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-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 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
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
EVALUATION BOARDS Download
document-generic User guide
29
Description

The MLTLDO2EVM-037 multipackage low-dropout (LDO) evaluation module (EVM) allows design engineers to evaluate the operation and performance of several common packages of linear regulators for possible use in their own circuit application. This EVM configuration contains a DDA, 3-pin and 5-pin KVU (...)

Features
  • Supports most LDO linear regulators in
    • DDA package
    • 3-pin and 5-pin KVU package
    • DCY package

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
SOT-223 (DCY) 4 View options
TO-252 (KVU) 3 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Related videos