SNVS774Q May   2004  – June 2020 LM117 , LM317-N

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     Typical Application
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions, Metal Can Packages
    2.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information, LM117
    5. 7.5 Thermal Information, LM317-N
    6. 7.6 LM117 Electrical Characteristics
    7. 7.7 LM317-N Electrical Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Load Regulation
    4. 8.4 Device Functional Modes
      1. 8.4.1 External Capacitors
      2. 8.4.2 Protection Diodes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1  1.25-V to 25-V Adjustable Regulator
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
      2. 9.2.2  5-V Logic Regulator With Electronic Shutdown
      3. 9.2.3  Slow Turnon 15-V Regulator
      4. 9.2.4  Adjustable Regulator With Improved Ripple Rejection
      5. 9.2.5  High Stability 10-V Regulator
      6. 9.2.6  High-Current Adjustable Regulator
      7. 9.2.7  Emitter-Follower Current Amplifier
      8. 9.2.8  1-A Current Regulator
      9. 9.2.9  Common-Emitter Amplifier
      10. 9.2.10 Low-Cost 3-A Switching Regulator
      11. 9.2.11 Current-Limited Voltage Regulator
      12. 9.2.12 Adjusting Multiple On-Card Regulators With Single Control
      13. 9.2.13 AC Voltage Regulator
      14. 9.2.14 12-V Battery Charger
      15. 9.2.15 Adjustable 4-A Regulator
      16. 9.2.16 Current-Limited 6-V Charger
      17. 9.2.17 Digitally Selected Outputs
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Thermal Considerations
        1. 11.1.1.1 Heatsink Requirements
        2. 11.1.1.2 Heatsinking Surface Mount Packages
          1. 11.1.1.2.1 Heatsinking the SOT-223 (DCY) Package
          2. 11.1.1.2.2 Heatsinking the TO-263 (KTT) Package
          3. 11.1.1.2.3 Heatsinking the TO-252 (NDP) Package
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.2 5-V Logic Regulator With Electronic Shutdown

Figure 20 shows a variation of the 5-V output regulator application uses the L117 along with an NPN transistor to provide shutdown control. The NPN will either block or sink the current from the ADJ pin by responding to the TTL pin logic. When TTL is pulled high, the NPN is on and pulls the ADJ pin to GND, and the LM117 outputs about 1.25 V. When TTL is pulled low, the NPN is off and the regulator outputs according to the programmed adjustable voltage.

LM117 LM317-N 906303.gif

NOTE:

Min. output ≊ 1.2 V
Figure 20. 5-V Logic Regulator With Electronic Shutdown