SLVSHR6A July   2025  – November 2025 TPS1686

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 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  Switch Enable Pin (SWEN)
      7. 7.3.7  Analog Junction Temperature Monitor (TEMP)
      8. 7.3.8  Overtemperature Protection
      9. 7.3.9  Fault Response and Indication (FLT)
      10. 7.3.10 Power Good Indication (PG)
      11. 7.3.11 Output Discharge
      12. 7.3.12 FET Health Monitoring
      13. 7.3.13 Single Point Failure Mitigation
        1. 7.3.13.1 IMON Pin Single Point Failure
        2. 7.3.13.2 IREF Pin Single Point Failure
        3. 7.3.13.3 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. 8.2 Typical Application: 54V Fan Load Protection in Datacenter Servers
      1. 8.2.1 Application
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Performance Plots
    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 Third-Party Products Disclaimer
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.4 Inrush Current, Overcurrent, and Short-Circuit Protection

TPS1686x incorporates four levels of protection against overcurrent:

  1. Adjustable slew rate (dVdt) for inrush current control.
  2. Fixed current limit (Istart-up) for overcurrent protection during start-up if the slew rate current is too high.
  3. Foldback of current during Startup if device temperature starts rising to protect from Over Temperature.
  4. Circuit-breaker with an adjustable threshold (IOCP) and blanking timer (tITIMER) for overcurrent protection during steady-state.
  5. Fast-trip response to severe overcurrent faults with an adjustable threshold (ISFT = SFT_MUL × IOCP) to quickly protect against severe short-circuits , as well as a fixed threshold (IFFT) during steady state. Multiplier for SFT (SFT_MUL) is selected by resistor on SFT_SEL pin.