SLVSGG3A May   2022  – September 2022 TPS25985

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 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
  8. 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 General Purpose Comparator
      15. 8.3.15 FET Health Monitoring
      16. 8.3.16 Single Point Failure Mitigation
        1. 8.3.16.1 IMON Pin Single Point Failure
        2. 8.3.16.2 ILIM Pin Single Point Failure
        3. 8.3.16.3 IREF Pin Single Point Failure
        4. 8.3.16.4 ITIMER Pin Single Point Failure
    4. 8.4 Device Functional Modes
  9. 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
    2. 9.2 Typical Application: 12-V, 3.6-kW Power Path Protection in Datacenter Servers
      1. 9.2.1 Application
      2. 9.2.2 Design Requirements
      3. 9.2.3 Detailed Design Procedure
      4. 9.2.4 Application Performance Plots
    3. 9.3 Multiple eFuses, Parallel Connection with PMBus
    4. 9.4 Digital Telemetry Using External Microcontroller
    5. 9.5 What to Do and What Not to Do
  10. 10Power Supply Recommendations
    1. 10.1 Transient Protection
    2. 10.2 Output Short-Circuit Measurements
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.14 General Purpose Comparator

The device has a spare general purpose comparator whose inputs (CMPP, CMPM) and output (CMPOUT) are not connected to any internal logic, thereby allowing the user complete flexibility to use this comparator as per the system needs.

The comparator can be used for various purposes. Here are a few examples:

  • Adjustable fast overcurrent detect (PROCHOT#): IMON pin is connected to CMPM input and an appropriate reference voltage is connected to CMPP input. CMPOUT is connected to the PROCHOT# pin of the processor. When the load current crosses the set threshold, the CMPOUT goes low and signals the processor to throttle down immediately.

GUID-20220512-SS0I-QLWW-DPDN-7WKWN4LKSGPH-low.gifFigure 8-9 Adjustable Fast Overcurrent (PROCHOT#) Detect Using Internal Comparator
GUID-20220514-SS0I-JZDZ-NNHR-PFJDLQPJHBW8-low.gifFigure 8-10 PROCHOT# Response Using Internal Comparator

  • Fast overvoltage protection with adjustable threshold: Input supply is connected to CMPM input through a resistor divider and an appropriate reference voltage is connected to CMPP input. CMPOUT is connected to the EN/UVLO pin. When the input supply crosses the set threshold, the CMPOUT goes low and turns off the part.

GUID-20220512-SS0I-MWFM-J5FQ-8DCH3MK2JCZF-low.gifFigure 8-11 Fast Overvoltage Protection with Adjustable Threshold Using Internal Comparator

  • Load handshake or detect timer: An R-C network from VOUT supply is connected to CMPM input through a resistor divider and an appropriate reference voltage is connected to the CMPP input. CMPOUT is connected to the EN/UVLO pin. After the device turns on, the R-C on VOUT starts charging and after it crosses the threshold, CMPOUT goes low to pull down the EN/UVLO and turn off the device, unless the downstream circuit indicates it has powered up successfully by driving the CMPM input low within the expected amount of time determined by the R-C time constant.

GUID-20220512-SS0I-FBXC-WSDN-DMGBTPVJR0BQ-low.gifFigure 8-12 Load Handshake or Detect Timer Using Internal Comparator