SLVSI34A April   2025  – June 2025 TPS61372L

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Undervoltage Lockout
      2. 6.3.2 Enable and Disable
      3. 6.3.3 Error Amplifier
      4. 6.3.4 Bootstrap Voltage (BST)
      5. 6.3.5 Load Disconnect
      6. 6.3.6 Overvoltage Protection
      7. 6.3.7 Thermal Shutdown
      8. 6.3.8 Start-Up
      9. 6.3.9 Short Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Operation
      2. 6.4.2 Auto PFM Mode
      3. 6.4.3 Forced PWM Mode
      4. 6.4.4 Mode Selectable
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 Setting the Output Voltage
        3. 7.2.2.3 Selecting the Inductor
        4. 7.2.2.4 Selecting the Output Capacitors
        5. 7.2.2.5 Selecting the Input Capacitors
        6. 7.2.2.6 Loop Stability and Compensation
          1. 7.2.2.6.1 Small Signal Model
        7. 7.2.2.7 Loop Compensation Design Steps
        8. 7.2.2.8 Selecting the Bootstrap Capacitor
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
        1. 7.4.2.1 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Development Support
        1. 8.1.2.1 Custom Design With WEBENCH® Tools
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.8 Start-Up

The TPS61372L implements the soft start function to reduce the inrush current during start-up. The TPS61372L begins soft start when the EN pin is pulled high. There are two phases for the start-up procedure:

  • When VOUT is below 120% VIN, the output voltage ramps up with the switching frequency of 535kHz (typical).
  • When VOUT exceeds 120% VIN, the switching frequency changes to 1.5MHz typically and ramps up the output voltage to the setpoint.