SLVSEU9D November   2018  – January 2021 TPS63802

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  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  Control Loop Description
      2. 9.3.2  Precise Device Enable: Threshold- or Delayed Enable
      3. 9.3.3  Mode Selection (PFM/PWM)
      4. 9.3.4  Undervoltage Lockout (UVLO)
      5. 9.3.5  Soft Start
      6. 9.3.6  Adjustable Output Voltage
      7. 9.3.7  Overtemperature Protection - Thermal Shutdown
      8. 9.3.8  Input Overvoltage - Reverse-Boost Protection (IVP)
      9. 9.3.9  Output Overvoltage Protection (OVP)
      10. 9.3.10 Power-Good Indicator
    4. 9.4 Device Functional Modes
      1. 9.4.1 Peak-Current Mode Architecture
        1. 9.4.1.1 Reverse Current Operation, Negative Current
        2. 9.4.1.2 Boost Operation
        3. 9.4.1.3 Buck-Boost Operation
        4. 9.4.1.4 Buck Operation
      2. 9.4.2 Power Save Mode Operation
        1. 9.4.2.1 Current Limit Operation
  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 Inductor Selection
        3. 10.2.2.3 Output Capacitor Selection
        4. 10.2.2.4 Input Capacitor Selection
        5. 10.2.2.5 Setting The Output Voltage
      3. 10.2.3 Application Curves
  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. 13.1.2 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

9.3.5 Soft Start

To minimize inrush current and output voltage overshoot during start-up, the device features a controlled soft start-up. After the device is enabled, the device starts all internal reference and control circuits within the enable delay time, Tdelay. After that, the maximum switch current limit rises monotonically from 0 mA to the current limit. The loop stops switching once VO is reached. This allows a quick output voltage ramp for small capacitors at the output. The bigger the output capacitor, the longer it takes to settle Vo. A potential load during start-up will lengthen the duration of the output voltage ramp as well. The gradual ramp of the current limit allows a small inrush current for no-load conditions, as well as the possibility to start into high loads at start-up.

The converter can start-up into pre-biased loads by a forced operation in PFM during the soft-start until the first switching cycle request from the output voltage control loop.

GUID-EAA4AF6E-8CFE-4AD9-A47A-9DEF80FA1451-low.gifFigure 9-4 Device Start-up Scheme