ZHCSO65B January   2023  – January 2024 LMR38020-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 System Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed Frequency Peak Current Mode Control
      2. 7.3.2  Adjustable Output Voltage
      3. 7.3.3  Enable
      4. 7.3.4  Switching Frequency and Synchronization (RT/SYNC)
      5. 7.3.5  Power-Good Flag Output
      6. 7.3.6  Minimum On Time, Minimum Off Time, and Frequency Foldback
      7. 7.3.7  Bootstrap Voltage
      8. 7.3.8  Overcurrent and Short Circuit Protection
      9. 7.3.9  Soft Start
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Auto Mode
      2. 7.4.2 Forced PWM Operation
      3. 7.4.3 Dropout
      4. 7.4.4 Minimum Switch On Time
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Choosing the Switching Frequency
        3. 8.2.2.3 FB for Adjustable Output
        4. 8.2.2.4 Inductor Selection
        5. 8.2.2.5 Output Capacitor Selection
        6. 8.2.2.6 Input Capacitor Selection
        7. 8.2.2.7 CBOOT
        8. 8.2.2.8 External UVLO
        9. 8.2.2.9 Maximum Ambient Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 第三方产品免责声明
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 接收文档更新通知
    4. 9.4 支持资源
    5. 9.5 Trademarks
    6. 9.6 静电放电警告
    7. 9.7 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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6.7 Typical Characteristics

Unless otherwise specified the following conditions apply: TA = 25°C, VIN = 24 V, fSW = 400 kHz

GUID-20211109-SS0I-BD3J-DPW0-9KCVPPVKPTFZ-low.svg
FSW = 400 kHzVOUT = 12.0 V
Figure 6-1 Efficiency vs Load Current
GUID-20211109-SS0I-H1N9-QLHX-DQ1W9WGN9KC0-low.svg
FSW = 400 kHzVOUT = 5.0 VPFM version
Figure 6-3 5-V Dropout
GUID-20230508-SS0I-BQ5Z-PBVG-LQQLXDKBSBSW-low.svg
VOUT = 5.0 V FPWM version
Figure 6-5 High-Side and Low-Side Current Limit vs Temperature
GUID-20211105-SS0I-9MCL-HT29-MLSKDJ3JNSF8-low.svg
VOUT = 5 V RFBB = 100 k L = 15 μH (PFM)
Figure 6-2 No Load Input Current vs Input Voltage
GUID-20211109-SS0I-GTT0-FH1V-Z9S0QPCWVPTC-low.svg
Input voltage = 48 VIOUT = 2 AFPWM version
Figure 6-4 Reference Voltage vs Temperature
GUID-20211109-SS0I-CXQ9-JR2D-ZXCVF1HDKZV1-low.svgFigure 6-6 VIN UVLO vs Temperature