SNVSC40E August   2021  – September 2023 LMR38020

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 System Characteristics
    7. 7.7 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency Peak Current Mode Control
      2. 8.3.2  Adjustable Output Voltage
      3. 8.3.3  Enable
      4. 8.3.4  Switching Frequency and Synchronization (RT/SYNC)
      5. 8.3.5  Power-Good Flag Output
      6. 8.3.6  Minimum On Time, Minimum Off Time, and Frequency Foldback
      7. 8.3.7  Bootstrap Voltage
      8. 8.3.8  Overcurrent and Short Circuit Protection
      9. 8.3.9  Soft Start
      10. 8.3.10 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Auto Mode
      2. 8.4.2 Forced PWM Operation
      3. 8.4.3 Dropout
      4. 8.4.4 Minimum Switch On Time
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Choosing the Switching Frequency
        3. 9.2.2.3 FB for Adjustable Output
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Output Capacitor Selection
        6. 9.2.2.6 Input Capacitor Selection
        7. 9.2.2.7 CBOOT
        8. 9.2.2.8 External UVLO
        9. 9.2.2.9 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
    3. 9.3 Best Design Practices
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
        1. 9.5.1.1 Ground and Thermal Considerations
      2. 9.5.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Custom Design With WEBENCH® Tools
      2. 10.1.2 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

7.7 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 7-1 Efficiency vs Load Current
GUID-20211109-SS0I-H1N9-QLHX-DQ1W9WGN9KC0-low.svg
FSW = 400 kHzVOUT = 5.0 VPFM version
Figure 7-3 5-V Dropout
GUID-20230508-SS0I-BQ5Z-PBVG-LQQLXDKBSBSW-low.svg
VOUT = 5.0 V FPWM version
Figure 7-5 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 7-2 No Load Input Current vs Input Voltage
GUID-20211109-SS0I-GTT0-FH1V-Z9S0QPCWVPTC-low.svg
Input voltage = 48 VIOUT = 2 AFPWM version
Figure 7-4 Reference Voltage vs Temperature
GUID-20211109-SS0I-CXQ9-JR2D-ZXCVF1HDKZV1-low.svgFigure 7-6 VIN UVLO vs Temperature