SLVSES4C September   2019  – June 2021 TPS54J060

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Enable and Internal LDO
      2. 7.3.2  Split Rail and External LDO
      3. 7.3.3  Output Voltage Setting
      4. 7.3.4  Soft Start and Output-Voltage Tracking
      5. 7.3.5  Frequency and Operation Mode Selection
      6. 7.3.6  D-CAP3 Control
      7. 7.3.7  Current Sense and Positive Overcurrent Protection
      8. 7.3.8  Low-side FET Negative Current Limit
      9. 7.3.9  Power Good
      10. 7.3.10 Overvoltage and Undervoltage Protection
      11. 7.3.11 Out-Of-Bounds Operation (OOB)
      12. 7.3.12 Output Voltage Discharge
      13. 7.3.13 UVLO Protection
      14. 7.3.14 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Auto-Skip Eco-Mode Light Load Operation
      2. 7.4.2 Forced Continuous-Conduction Mode
      3. 7.4.3 Pre-Bias Start-up
  8. 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  Choose the Switching Frequency and Operation Mode (MODE Pin)
        2. 8.2.2.2  Choose the Output Inductor (L)
        3. 8.2.2.3  Set the Current Limit (TRIP)
        4. 8.2.2.4  Choose the Output Capacitors (COUT)
        5. 8.2.2.5  Choose the Input Capacitors (CIN)
        6. 8.2.2.6  Feedback Network (FB Pin)
        7. 8.2.2.7  Soft Start Capacitor (SS/REFIN Pin)
        8. 8.2.2.8  EN Pin Resistor Divider
        9. 8.2.2.9  VCC Bypass Capacitor
        10. 8.2.2.10 BOOT Capacitor
        11. 8.2.2.11 Series BOOT Resistor and RC Snubber
        12. 8.2.2.12 PGOOD Pullup Resistor
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Support Resources
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Trademarks
    5. 11.5 Glossary
    6. 11.6 Electrostatic Discharge Caution
  12. 12Mechanical, Packaging, and Ordering Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4.3 Pre-Bias Start-up

When the TPS54J060 begins soft start, internal circuitry detects if there is a voltage already present on the output. This can be due to a leakage current path in a multi-rail system charging the output capacitors. If the pre-biased voltage is greater than the output voltage commanded by the soft-start voltage, the TPS54J060 operates in Pulse-skip mode during the rise of soft start. When the soft-start voltage reaches a point where the commanded output voltage is greater than the pre-bias voltage, then normal switching occurs.