SLVSGX1B July   2023  – April 2025 TPS25984

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description (continued)
  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 Logic Interface
    7. 6.7 Timing Requirements
    8. 6.8 Switching Characteristics
    9. 6.9 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  Undervoltage Protection
      2. 7.3.2  Insertion Delay
      3. 7.3.3  Overvoltage Protection
      4. 7.3.4  Inrush Current, Overcurrent, and Short-Circuit Protection
        1. 7.3.4.1 Slew Rate (dVdt) and Inrush Current Control
          1. 7.3.4.1.1 Start-Up Time Out
        2. 7.3.4.2 Steady-State Overcurrent Protection (Circuit-Breaker)
        3. 7.3.4.3 Active Current Limiting During Start-Up
        4. 7.3.4.4 Short-Circuit Protection
      5. 7.3.5  Analog Load Current Monitor (IMON)
      6. 7.3.6  Mode Selection (MODE)
      7. 7.3.7  Parallel Device Synchronization (SWEN)
      8. 7.3.8  Stacking Multiple eFuses for Unlimited Scalability
        1. 7.3.8.1 Current Balancing During Start-Up
      9. 7.3.9  Analog Junction Temperature Monitor (TEMP)
      10. 7.3.10 Overtemperature Protection
      11. 7.3.11 Fault Response and Indication (FLT)
      12. 7.3.12 Power-Good Indication (PG)
      13. 7.3.13 Output Discharge
      14. 7.3.14 FET Health Monitoring
      15. 7.3.15 Single Point Failure Mitigation
        1. 7.3.15.1 IMON Pin Single Point Failure
        2. 7.3.15.2 ILIM Pin Single Point Failure
        3. 7.3.15.3 IREF Pin Single Point Failure
        4. 7.3.15.4 ITIMER Pin Single Point Failure
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Single Device, Standalone Operation
      2. 8.1.2 Multiple Devices, Parallel Connection
      3. 8.1.3 Multiple eFuses, Parallel Connection With PMBus
      4. 8.1.4 Digital Telemetry Using External Microcontroller
    2. 8.2 Typical Application: 12-V, 3.3-kW Power Path Protection in Data Center Servers
      1. 8.2.1 Application
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
      1. 8.4.1 Transient Protection
      2. 8.4.2 Output short-Circuit Measurements
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.1 Undervoltage Protection

The TPS25984x implements undervoltage lockout on VDD and VIN in case the applied voltage becomes too low for the system or device to properly operate. The undervoltage lockout has a default internal threshold of VUVP on VDD and VUVPIN on VIN. Alternatively, the UVLO comparator on the EN/UVLO pin allows the undervoltage protection threshold to be externally adjusted to a user defined value. Figure 7-1 and Equation 1 show how a resistor divider can be used to set the UVLO set point for a given voltage supply.

TPS25984 Adjustable Undervoltage Protection Figure 7-1 Adjustable Undervoltage Protection
Equation 1. V I N U V = V U V L O R R 1 + R 2 R 2

The EN/UVLO pin implements a bi-level threshold.

  1. VEN > VUVLO(R): Device is fully ON.
  2. VSD(F) < VEN < VUVLO(F): The FET along with most of the controller circuitry is turned OFF, except for some critical bias and digital circuitry. Holding the EN/UVLO pin in this state for > tQOD activates the Output Discharge function.
  3. VEN < VSD(F): All active circuitry inside the part is turned OFF and it retains no digital state memory. It also resets any latched faults. In this condition, the device quiescent current consumption is minimal.