PDF《SLVS297P – APRIL 2000 – REVISED》

LM317M SLVS297P CAPRIL 2000CREVISED MARCH

2014 LM317M 3-Terminal Adjustable Regulator

1 Features

3 Description The LM317M is an adjustable 3-terminal positive 1? Output Voltage Range Adjustable voltage regulator capable of supplying more than from 1.

25-V to 37-V 500-mA over an output-voltage range of 1.25-V to ? Output Current Greater Than 500-mA 37-V. The LM317M is exceptionally easy to use and ? Internal Short-Circuit Current Limiting requires only two external resistors to set the output. Furthermore, both line and load regulation are better ? Thermal-Overload Protection than standard fixed regulators. ? Output Safe-Area Compensation In addition to having higher performance than fixed ? Q Devices Meet Automotive Performance regulators, the LM317M includes on-chip current Requirements limiting, thermal-overload protection, and safe- ? Customer-Specific Configuration Control Can Be operating-area protection. All overload protection Supported for Q Devices Along With remains fully functional if the ADJUST terminal is Major-Change Approval disconnected. The LM317 is a floating regulator meaning there is no

2 Applications device ground terminal. Quiescent current flows to ? Electronic Point-of-Sales the load instead of being wasted flowing to ground. Regulated output voltage of hundreds of volts is ? Medical/Health/Fitness Applications possible if the maximum input to output differential ? Printers does not exceed 40-V at any time. Device can be ? Appliances/White Goods used as a floating current source controlled by a single resistor. ? TV/Set-Top Box 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. Device Information ORDER NUMBER PACKAGE BODY SIZE LM317MDCY SOT-223 (3) 6,5mm x 3,5mm LM317MKVURG3 TO-252 (3) 6,6mm x 6,1mm LM317MKTPR PFM (3) 6,04mm x 6,15mm

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. LM317M SLVS297P CAPRIL 2000CREVISED MARCH

2014 www.ti.com Table of Contents 7.3 Feature Description.7

1 Features.1 7.4 Device Functional Modes.8

2 Applications

1 8 Applications and Implementation

9 3 Description

1 8.1 Application Information.9

4 Revision History.2 8.2 Typical Application

9 5 Terminal Configuration and Functions.3

9 Power Supply Recommendations.11

6 Specifications.3

10 Layout.11 6.1 Absolute Maximum Ratings

3 10.1 Layout Guidelines

11 6.2 Handling Ratings.3 10.2 Layout Example

11 6.3 Recommended Operating Conditions.3

11 Device and Documentation Support

12 6.4 Thermal Information.4 11.1 Trademarks.12 6.5 Electrical Characteristics.4 11.2 Electrostatic Discharge Caution.12 6.6 Typical Characteristics.5 11.3 Glossary.12

7 Detailed Description

7 12 Mechanical, Packaging, and Orderable 7.1 Overview

7 Information

12 7.2 Functional Block Diagram

7 4 Revision History Changes from Revision O (July 2006) to Revision P Page ? Removed Ordering Information Table

1 ? Clarified TJ package field

3 2 Submit Documentation Feedback Copyright ? 2000C2014, Texas Instruments Incorporated Product Folder Links: LM317M LM317M www.ti.com SLVS297P CAPRIL 2000CREVISED MARCH