JAJSNZ8A February   2022  – April 2022 LM5152-Q1 , LM51521-Q1

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 概要 (続き)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 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. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Device Enable/Disable (EN, VH Pin)
      2. 9.3.2  High Voltage VCC Regulator (BIAS, VCC Pin)
      3. 9.3.3  Light Load Switching Mode Selection (MODE Pin)
      4. 9.3.4  Line Undervoltage Lockout (UVLO Pin)
      5. 9.3.5  Fast Restart Using VCC HOLD (VH Pin)
      6. 9.3.6  Adjustable Output Regulation Target (VOUT, TRK, VREF Pin)
      7. 9.3.7  Overvoltage Protection (VOUT Pin)
      8. 9.3.8  Boost Status Indicator (STATUS Pin)
      9. 9.3.9  Dynamically Programmable Switching Frequency (RT)
      10. 9.3.10 External Clock Synchronization (SYNC Pin)
      11. 9.3.11 Programmable Spread Spectrum (DITHER Pin)
      12. 9.3.12 Programmable Soft Start (SS Pin)
      13. 9.3.13 Wide Bandwidth Transconductance Error Amplifier and PWM (TRK, COMP Pin)
      14. 9.3.14 Current Sensing and Slope Compensation (CSP, CSN Pin)
      15. 9.3.15 Constant Peak Current Limit (CSP, CSN Pin)
      16. 9.3.16 Maximum Duty Cycle and Minimum Controllable On-Time Limits
      17. 9.3.17 Deep Sleep Mode and Bypass Operation (HO, CP Pin)
      18. 9.3.18 MOSFET Drivers, Integrated Boot Diode, and Hiccup Mode Fault Protection (LO, HO, HB Pin)
      19. 9.3.19 Thermal Shutdown Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device Status
        1. 9.4.1.1 Shutdown Mode
        2. 9.4.1.2 Configuration Mode
        3. 9.4.1.3 Active Mode
        4. 9.4.1.4 Sleep Mode
        5. 9.4.1.5 Deep Sleep Mode
      2. 9.4.2 Light Load Switching Mode
        1. 9.4.2.1 Forced PWM (FPWM) Mode
        2. 9.4.2.2 Diode Emulation (DE) Mode
        3. 9.4.2.3 Forced Diode Emulation Operation in FPWM Mode
        4. 9.4.2.4 Skip 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 Application Ideas
      3. 10.2.3 Application Curves
    3. 10.3 System Example
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 サポート・リソース
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

9.4.2 Light Load Switching Mode

The device provides three light load switching modes. Inductor current waveforms in each mode are different at the light or no load condition.

GUID-DE2EC3E4-47F0-41C3-BF24-24DFC78376B9-low.gifFigure 9-22 Inductor Current Waveform at Light Load (a) FPWM (b) Diode Emulation (c) Skip Mode