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LM317 Datasheet

3-Terminal Adjustable Regulator

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LM317
SLVS044Y – SEPTEMBER 1997 – REVISED APRIL 2020
LM317 3-Terminal Adjustable Regulator
1 Features
1 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
2 Applications
• ATCA solutions
• DLP: 3D biometrics, hyperspectral imaging,
optical networking, and spectroscopy
• DVR and DVS
• Desktop PCs
• Digital signage and still cameras
• ECG electrocardiograms
• EV HEV chargers: levels 1, 2, and 3
• Electronic shelf labels
• Energy harvesting
• Ethernet switches
• Femto base stations
• Fingerprint and iris biometrics
• HVAC: heating, ventilating, and air conditioning
• High-speed data acquisition and generation
• Hydraulic valves
• IP phones: wired and wireless
• Intelligent occupancy sensing
• Motor controls: brushed DC, brushless DC, low-
voltage, permanent magnet, and stepper motors
• Point-to-point microwave backhauls
• Power bank solutions
• Power line communication modems
• Power over ethernet (PoE)
• Power quality meters
• Power substation controls
• Private branch exchanges (PBX)
• Programmable logic controllers
• RFID readers
• Refrigerators
• Signal or waveform generators
• Software-defined radios (SDR)
• Washing machines: high-end and low-end
• X-rays: baggage scanners, medical, and dental
3 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM317DCY
SOT-223 (4)
6.50 mm × 3.50 mm
LM317KCS
TO-220 (3)
10.16 mm × 9.15 mm
LM317KCT
TO-220 (3)
10.16 mm × 8.59 mm
LM317KTT
TO-263 (3)
10.16 mm × 9.01 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Battery-Charger Circuit
LM317
RS
0.2 W
VI
INPUT OUTPUT
ADJUST
R1
240 W
R2
2.4 kW
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

LM317 Datasheet Preview

LM317 Datasheet

3-Terminal Adjustable Regulator

No Preview Available !

LM317
SLVS044Y – SEPTEMBER 1997 – REVISED APRIL 2020
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 7
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 10
9 Application and Implementation ........................ 11
9.1 Application Information............................................ 11
9.2 Typical Application .................................................. 11
9.3 System Examples ................................................... 12
10 Power Supply Recommendations ..................... 18
11 Layout................................................................... 18
11.1 Layout Guidelines ................................................. 18
11.2 Layout Example .................................................... 18
12 Device and Documentation Support ................. 19
12.1 Receiving Notification of Documentation Updates 19
12.2 Support Resources ............................................... 19
12.3 Trademarks ........................................................... 19
12.4 Electrostatic Discharge Caution ............................ 19
12.5 Glossary ................................................................ 19
13 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
Changes from Revision X (September 2016) to Revision Y
Page
• Added Device Comparison Table .......................................................................................................................................... 3
• Changed VIN to IOUT in Load Transient Response figures ...................................................................................................... 7
• Added missing caption to second y-axis in second Load Transient Response figure ........................................................... 7
• Changed VOUT and output impedance equations in Battery-Charger Circuit section ........................................................... 14
Changes from Revision W (January 2015) to Revision X
Page
• Changed body size dimensions for KCS TO-220 Package on Device information table ...................................................... 1
• Changed body size dimensions for KTT TO-263 Package on Device information table ...................................................... 1
• Changed VO Output Voltage max value from 7 to 37 on Recommended Operating Conditions table .................................. 5
• Added min value to IO Output Current in Recommended Operating Conditions table .......................................................... 5
• Changed values in the Thermal Information table to align with JEDEC standards ............................................................... 5
• Added KCT package data to Thermal Information table ....................................................................................................... 5
• Deleted Section 9.3.6 "Adjusting Multiple On-Card Regulators with a Single Control" ....................................................... 14
• Updated Adjustsable 4-A Regulator Circuit graphic ............................................................................................................ 16
• Added Receiving Notification of Documentation Updates section and Community Resources section .............................. 19
Changes from Revision V (February 2013) to Revision W
Page
• Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,
Packaging, and Orderable Information section. ..................................................................................................................... 1
• Deleted Ordering Information table. ....................................................................................................................................... 1
2
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Copyright © 1997–2020, Texas Instruments Incorporated


Part Number LM317
Description 3-Terminal Adjustable Regulator
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