SLVSFC9C October   2020  – May 2026 TPS25947

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  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 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 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  Input Reverse Polarity Protection
      2. 7.3.2  Undervoltage Lockout (UVLO and UVP)
      3. 7.3.3  Overvoltage Lockout (OVLO)
      4. 7.3.4  Overvoltage Clamp (OVC)
      5. 7.3.5  Inrush Current, Overcurrent, and Short Circuit Protection
        1. 7.3.5.1 Slew Rate (dVdt) and Inrush Current Control
        2. 7.3.5.2 Circuit-Breaker
        3. 7.3.5.3 Active Current Limiting
        4. 7.3.5.4 Short-Circuit Protection
      6. 7.3.6  Analog Load Current Monitor
      7. 7.3.7  Reverse Current Protection
      8. 7.3.8  Overtemperature Protection (OTP)
      9. 7.3.9  Fault Response and Indication (FLT)
      10. 7.3.10 Auxiliary Channel Control (AUXOFF)
      11. 7.3.11 Power Good Indication (PG)
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Single Device, Self-Controlled
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Device Selection
        2. 8.2.2.2 Setting Undervoltage and Overvoltage Thresholds
        3. 8.2.2.3 Setting Output Voltage Rise Time (tR)
        4. 8.2.2.4 Setting Power Good Assertion Threshold
        5. 8.2.2.5 Setting Overcurrent Threshold (ILIM)
        6. 8.2.2.6 Setting Overcurrent Blanking Interval (tITIMER)
      3. 8.2.3 Application Curves
      4. 8.2.4 Active ORing
      5. 8.2.5 Priority Power MUXing
      6. 8.2.6 USB PD Port Protection
      7. 8.2.7 Parallel Operation
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Transient Protection
      2. 8.3.2 Output Short-Circuit Measurements
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.2 Undervoltage Lockout (UVLO and UVP)

The TPS25947xx implements Undervoltage Protection on IN in case the applied voltage becomes too low for the system or device to properly operate. The Undervoltage Protection has a default lockout threshold of VUVP which is fixed internally. Also, the UVLO comparator on the EN/UVLO pin allows the Undervoltage Protection threshold to be externally adjusted to a user defined value. The Figure 7-4 and Equation 1 show how a resistor divider can be used to set the UVLO set point for a given voltage supply.

TPS25947 Adjustable Undervoltage ProtectionFigure 7-4 Adjustable Undervoltage Protection
Equation 1. V I N U V = V U V L O × R 1 + R 2 R 2