SNVSAY0 June   2017 LM317-N-MIL

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Load Regulation
    4. 7.4 Device Functional Modes
      1. 7.4.1 External Capacitors
      2. 7.4.2 Protection Diodes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1  1.25-V to 25-V Adjustable Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2  5-V Logic Regulator With Electronic Shutdown
      3. 8.2.3  Slow Turnon 15-V Regulator
      4. 8.2.4  Adjustable Regulator With Improved Ripple Rejection
      5. 8.2.5  High Stability 10-V Regulator
      6. 8.2.6  High-Current Adjustable Regulator
      7. 8.2.7  Emitter-Follower Current Amplifier
      8. 8.2.8  1-A Current Regulator
      9. 8.2.9  Common-Emitter Amplifier
      10. 8.2.10 Low-Cost 3-A Switching Regulator
      11. 8.2.11 Current-Limited Voltage Regulator
      12. 8.2.12 Adjusting Multiple On-Card Regulators With Single Control
      13. 8.2.13 AC Voltage Regulator
      14. 8.2.14 12-V Battery Charger
      15. 8.2.15 Adjustable 4-A Regulator
      16. 8.2.16 Current-Limited 6-V Charger
      17. 8.2.17 Digitally Selected Outputs
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Heatsink Requirements
      2. 10.3.2 Heatsinking Surface Mount Packages
        1. 10.3.2.1 Heatsinking the SOT-223 (DCY) Package
        2. 10.3.2.2 Heatsinking the TO-263 (KTT) Package
        3. 10.3.2.3 Heatsinking the TO-252 (NDP) Package
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Typ. 0.1% Load Regulation
  • Typ. 0.01%/V Line Regulation
  • 1.5-A Output Current
  • Adjustable Output Down to 1.25 V
  • Current Limit Constant With Temperature
  • 80-dB Ripple Rejection
  • Short-Circuit Protected Output

2 Applications

  • Automotive LED Lighting
  • Battery Chargers
  • Post Regulation for Switching Supplies
  • Constant Current Regulators
  • Microprocessor Supplies

Typical Application

LM317-N-MIL snvsay0_typapp1.gif
*Needed if device is more than 6 inches from filter capacitors.
†Optional—improves transient response
†† LM317-N-MIL eq1_VOUT_SNVS773.gif

3 Description

The LM317-N-MIL adjustable 3-pin positive voltage regulator is capable of supplying in excess of 1.5 A over a 1.25-V to 37-V output range and a wide temperature range. The LM317-N-MIL is easy to use and requires only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators.

The LM317-N-MIL offers full overload protection, such as current limit, thermal overload protection, and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. That is, avoid short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM317-N-MIL can be also used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground, which programs the output to 1.25 V where most loads draw little current.

For applications requiring greater output current, see data sheets for LM150 series (3 A), SNVS772, and LM138 series (5 A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM317-N-MIL TO-3 (2) 38.94 mm x 25.40 mm
TO-220 (3) 14.986 mm × 10.16 mm
TO-263 (3) 10.18 mm × 8.41 mm
SOT-223 (4) 6.50 mm × 3.50 mm
TO (3) 8.255 mm × 8.255 mm
TO-252 (3) 6.58 mm × 6.10 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Revision History

DATE REVISION NOTES
June 2017 * Initial Release