SNVSBK8A October   2020  – March 2021 LM5157-Q1 , LM51571-Q1

PRODMIX  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (continued)
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Line Undervoltage Lockout (UVLO/SYNC/EN Pin)
      2. 9.3.2  High Voltage VCC Regulator (BIAS, VCC Pin)
      3. 9.3.3  Soft Start (SS Pin)
      4. 9.3.4  Switching Frequency (RT Pin)
      5. 9.3.5  Dual Random Spread Spectrum - DRSS (MODE Pin)
      6. 9.3.6  Clock Synchronization (UVLO/SYNC/EN Pin)
      7. 9.3.7  Current Sense and Slope Compensation
      8. 9.3.8  Current Limit and Minimum On Time
      9. 9.3.9  Feedback and Error Amplifier (FB, COMP Pin)
      10. 9.3.10 Power-Good Indicator (PGOOD Pin)
      11. 9.3.11 Hiccup Mode Overload Protection (MODE Pin)
      12. 9.3.12 Maximum Duty Cycle Limit and Minimum Input Supply Voltage
      13. 9.3.13 Internal MOSFET (SW Pin)
      14. 9.3.14 Overvoltage Protection (OVP)
      15. 9.3.15 Thermal Shutdown (TSD)
    4. 9.4 Device Functional Modes
      1. 9.4.1 Shutdown Mode
      2. 9.4.2 Standby Mode
      3. 9.4.3 Run Mode
        1. 9.4.3.1 Spread Spectrum Enabled
        2. 9.4.3.2 Hiccup Mode Protection Enabled
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Custom Design With WEBENCH® Tools
        2. 10.2.2.2 Recommended Components
        3. 10.2.2.3 Inductor Selection (LM)
        4. 10.2.2.4 Output Capacitor (COUT)
        5. 10.2.2.5 Input Capacitor
        6. 10.2.2.6 Diode Selection
      3. 10.2.3 Application Curve
    3. 10.3 System Examples
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Examples
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
      2. 13.1.2 Development Support
        1. 13.1.2.1 Custom Design With WEBENCH® Tools
      3. 13.1.3 Export Control Notice
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Support Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

Typical Characteristics

GUID-20210225-CA0I-8LVG-GVRC-MWKTW4XBQ38G-low.pngFigure 8-1 BIAS Shutdown Current vs VBIAS
GUID-20210208-CA0I-HT4K-RDSD-DJDS3XB5BH6K-low.pngFigure 8-3 BIAS Operating Current vs Temperature
GUID-20210225-CA0I-KLL8-3GD3-H61HPP9ZQ7NL-low.pngFigure 8-5 VVCC vs IVCC
GUID-20210208-CA0I-X383-XWQR-3LTCFJNHT7QL-low.pngFigure 8-7 EN Threshold vs Temperature
GUID-20210208-CA0I-C7KP-1W1T-RK1TQX4XGNX9-low.pngFigure 8-9 FB Reference vs Temperature
GUID-20210208-CA0I-2LW9-DSZB-GFMS5XGVLG0B-low.pngFigure 8-11 Frequency vs Temperature
GUID-20210226-CA0I-QDGR-QLVL-NXWVKJBD9FX1-low.pngFigure 8-13 Peak Current Limit vs Duty Cycle
GUID-20210226-CA0I-CTPK-C2NX-R8NJVJPQF1ZP-low.pngFigure 8-15 Minimum On Time vs Frequency
GUID-20210208-CA0I-0HTK-KVX0-CJ8QP17QHGJQ-low.pngFigure 8-2 BIAS Shutdown Current vs Temperature
GUID-20210225-CA0I-XQKV-RMLW-NRQ1G9H6ZPCS-low.pngFigure 8-4 VVCC vs VBIAS
GUID-20210208-CA0I-QGWS-6X07-ZFZD5GWRJCKD-low.pngFigure 8-6 ISS vs Temperature
GUID-20210208-CA0I-Z19M-KCNL-HSJR9HMMZRMP-low.pngFigure 8-8 UVLO Threshold vs Temperature
GUID-20210225-CA0I-MS2L-D81V-J3T0BKH78FT8-low.pngFigure 8-10 Frequency vs RT Resistance
GUID-20210208-CA0I-J9B8-KCQ0-68F0FL6QRFG4-low.pngFigure 8-12 Current Limit Threshold vs Temperature
GUID-20210208-CA0I-PNW7-Z2BF-KJ4K7FQJVDGP-low.pngFigure 8-14 Internal MOSFET Drain Source On-state Resistance vs Temperature
GUID-20210226-CA0I-7L76-S1WV-VFWJPW46LZBR-low.pngFigure 8-16 Maximum Duty Cycle Limit vs Frequency