SLVS044X September   1997  – September 2016 LM317

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 NPN Darlington Output Drive
      2. 7.3.2 Overload Block
      3. 7.3.3 Programmable Feedback
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Operation With Low Input Voltage
      3. 7.4.3 Operation at Light Loads
      4. 7.4.4 Operation In Self Protection
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1  0-V to 30-V Regulator Circuit
      2. 8.3.2  Adjustable Regulator Circuit With Improved Ripple Rejection
      3. 8.3.3  Precision Current-Limiter Circuit
      4. 8.3.4  Tracking Preregulator Circuit
      5. 8.3.5  1.25-V to 20-V Regulator Circuit With Minimum Program Current
      6. 8.3.6  Battery-Charger Circuit
      7. 8.3.7  50-mA Constant-Current Battery-Charger Circuit
      8. 8.3.8  Slow Turn-On 15-V Regulator Circuit
      9. 8.3.9  AC Voltage-Regulator Circuit
      10. 8.3.10 Current-Limited 6-V Charger Circuit
      11. 8.3.11 Adjustable 4-A Regulator Circuit
      12. 8.3.12 High-Current Adjustable Regulator Circuit
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 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

2 Applications

  • ATCA Solutions
  • DLP: 3D Biometrics, Hyperspectral Imaging, Optical Networking, and Spectroscopy
  • DVR and DVS
  • Desktop PC
  • Digital Signage and Still Camera
  • ECG Electrocardiogram
  • EV HEV Charger: Level 1, 2, and 3
  • Electronic Shelf Label
  • Energy Harvesting
  • Ethernet Switch
  • Femto Base Station
  • Fingerprint and Iris Biometrics
  • HVAC: Heating, Ventilating, and Air Conditioning
  • High-Speed Data Acquisition and Generation
  • Hydraulic Valve
  • IP Phone: Wired and Wireless
  • Intelligent Occupancy Sensing
  • Motor Control: Brushed DC, Brushless DC, Low-Voltage, Permanent Magnet, and Stepper Motor
  • Point-to-Point Microwave Backhaul
  • Power Bank Solutions
  • Power Line Communication Modem
  • Power Over Ethernet (PoE)
  • Power Quality Meter
  • Power Substation Control
  • Private Branch Exchange (PBX)
  • Programmable Logic Controller
  • RFID Reader
  • Refrigerator
  • Signal or Waveform Generator
  • Software Defined Radio (SDR)
  • Washing Machine: High-End and Low-End
  • X-ray: Baggage Scanner, 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 appin8_lvs044v2.gif