SNVSBI6 January   2021 LM5156 , LM51561

PRODUCTION DATA  

  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)
      6. 9.3.6  Clock Synchronization (UVLO/SYNC/EN Pin)
      7. 9.3.7  Current Sense and Slope Compensation (CS Pin)
      8. 9.3.8  Current Limit and Minimum On-time (CS Pin)
      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 (LM51561 Only)
      12. 9.3.12 Maximum Duty Cycle Limit and Minimum Input Supply Voltage
      13. 9.3.13 MOSFET Driver (GATE 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
  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 MOSFET Selection
        7. 10.2.2.7 Diode Selection
        8. 10.2.2.8 Efficiency Estimation
      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
    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-7055C0B9-6098-4331-B095-53E5D28487D0-low.gifFigure 8-1 Frequency vs RT Resistance
GUID-0BBC4087-65DC-4100-8000-9D1445F88725-low.gifFigure 8-3 VVCC vs IVCC
GUID-B622554C-5175-43E3-9BA3-760928278FA1-low.gifFigure 8-5 Peak Current Limit vs Duty Cycle
GUID-F76433D7-3447-4B86-977F-6D2622695DD3-low.gifFigure 8-7 FB Reference vs Temperature
GUID-437103F8-2D33-47B5-A004-30017DD0FB7B-low.gifFigure 8-9 IOPERATING(BIAS) Including RT Current vs VBIAS
GUID-A8B62C44-1EF6-4200-AFA2-ED09FC26A3C6-low.gifFigure 8-11 ISHUTDOWN vs Temperature
GUID-DBD4A9E7-EEA4-48D0-A5D4-FC9E432955D9-low.gifFigure 8-13 ISS vs Temperature
GUID-EB177216-0B9B-4174-AF17-27A51EA14E82-low.gifFigure 8-15 UVLO Threshold vs Temperature
GUID-F7F3F6D7-A43D-4792-B253-B9F3F20E0C7B-low.gifFigure 8-2 Frequency vs Temperature
GUID-5E811605-0C8D-4A3C-969F-820377510AAE-low.gifFigure 8-4 VVCC vs VBIAS (No Load)
GUID-08168199-25DA-4635-989C-40654E2A86BA-low.gifFigure 8-6 Current Limit Threshold vs Temperature
GUID-96FBCB86-5F0A-4DF5-8F37-DBCAAA3103E3-low.gifFigure 8-8 EN Threshold vs Temperature
GUID-E7E3E5F8-54CC-44B5-8238-52797630242A-low.gifFigure 8-10 ISHUTDOWN(BIAS) vs VBIAS
GUID-A647AF0C-D23A-4F86-8CB2-7950264B45E9-low.gifFigure 8-12 tON(MIN) vs Frequency
GUID-E314A25A-DCEF-4161-AEBE-1E4E03F53968-low.gifFigure 8-14 Peak Driver Current vs VCC
GUID-2B7B7A9C-1F44-45EF-82FD-1315B597E455-low.gifFigure 8-16 Maximum Duty Cycle vs Frequency