JAJSRN4A July   2023  – October 2023 TPS25984

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Revision History
  6. 5 概要 (続き)
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Logic Interface
    7. 7.7 Timing Requirements
    8. 7.8 Switching Characteristics
    9. 7.9 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Undervoltage Protection
      2. 8.3.2  Insertion Delay
      3. 8.3.3  Overvoltage Protection
      4. 8.3.4  Inrush Current, Overcurrent, and Short-Circuit Protection
        1. 8.3.4.1 Slew Rate (dVdt) and Inrush Current Control
          1. 8.3.4.1.1 Start-Up Time Out
        2. 8.3.4.2 Steady-State Overcurrent Protection (Circuit-Breaker)
        3. 8.3.4.3 Active Current Limiting During Start-Up
        4. 8.3.4.4 Short-Circuit Protection
      5. 8.3.5  Analog Load Current Monitor (IMON)
      6. 8.3.6  Mode Selection (MODE)
      7. 8.3.7  Parallel Device Synchronization (SWEN)
      8. 8.3.8  Stacking Multiple eFuses for Unlimited Scalability
        1. 8.3.8.1 Current Balancing During Start-Up
      9. 8.3.9  Analog Junction Temperature Monitor (TEMP)
      10. 8.3.10 Overtemperature Protection
      11. 8.3.11 Fault Response and Indication (FLT)
      12. 8.3.12 Power-Good Indication (PG)
      13. 8.3.13 Output Discharge
      14. 8.3.14 FET Health Monitoring
      15. 8.3.15 Single Point Failure Mitigation
        1. 8.3.15.1 IMON Pin Single Point Failure
        2. 8.3.15.2 ILIM Pin Single Point Failure
        3. 8.3.15.3 IREF Pin Single Point Failure
        4. 8.3.15.4 ITIMER Pin Single Point Failure
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Single Device, Standalone Operation
      2. 9.1.2 Multiple Devices, Parallel Connection
      3. 9.1.3 Multiple eFuses, Parallel Connection With PMBus
      4. 9.1.4 Digital Telemetry Using External Microcontroller
    2. 9.2 Typical Application: 12-V, 3.3-kW Power Path Protection in Data Center Servers
      1. 9.2.1 Application
      2. 9.2.2 Design Requirements
      3. 9.2.3 Detailed Design Procedure
      4. 9.2.4 Application Curves
    3. 9.3 Best Design Practices
    4. 9.4 Power Supply Recommendations
      1. 9.4.1 Transient Protection
      2. 9.4.2 Output short-Circuit Measurements
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 サポート・リソース
    3. 10.3 Trademarks
    4. 10.4 静電気放電に関する注意事項
    5. 10.5 用語集
  12. 11Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ

9.3 Best Design Practices

TPS25984x needs the SWEN pin to be pulled up to a supply rail which is powered up before the device is enabled. Failing this, the device is not able to turn on the output. The SWEN pullup supply must not be derived from the output of the eFuse. Use one of the following options to derive the pullup supply rail for SWEN.

  1. Use an existing standby rail in the system, which is derived from the main power input and comes up before the eFuse is turned on.
  2. Use an LDO (3.3 V or 5 V) powered from the main power input.
    GUID-018B57D4-F83E-4DC1-A0E1-B42D9C325368-low.svgFigure 9-13 LDO Used as Pullup Supply for SWEN
  3. Use a Zener regular powered from the main power input.
    GUID-A2D5F66F-FDD8-411A-A91F-1F802FF4068C-low.svgFigure 9-14 Zener Regulator Used as Pullup Supply for SWEN
  4. Use the ITIMER pin of the primary eFuse. Ensure the ITIMER pin does not have excess loading which can interfere with the normal overcurrent blanking timer functionality.
    GUID-D89B7507-6057-48C9-BA63-F6B77D21563E-low.svgFigure 9-15 ITIMER Pin Used as Pullup Supply for SWEN
The PG is an open-drain pin and must be pulled up to an external supply. Do not leave the PG pin floating or force the pin low externally during steady-state as it can interfere with the device operation.