SLVSHO1 March   2025 TPS1689

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics
    6. 5.6  PMBus and GPIO DC Characteristics
    7. 5.7  Telemetry
    8. 5.8  Logic Interface
    9. 5.9  Timing Requirements
    10. 5.10 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Undervoltage Protection
      2. 6.3.2  Insertion Delay
      3. 6.3.3  Overvoltage Protection
      4. 6.3.4  Inrush Current, Overcurrent, and Short-Circuit Protection
        1. 6.3.4.1 Slew rate (dVdt) and Inrush Current Control
          1. 6.3.4.1.1 Start-Up Timeout
        2. 6.3.4.2 Steady-State Overcurrent Protection (Circuit-Breaker)
        3. 6.3.4.3 Active Current Limiting During Start-Up
        4. 6.3.4.4 Short-Circuit Protection
      5. 6.3.5  Analog Load Current Monitor (IMON)
      6. 6.3.6  Overtemperature Protection
      7. 6.3.7  Analog Junction Temperature Monitor (TEMP)
      8. 6.3.8  FET Health Monitoring
      9. 6.3.9  Single Point Failure Mitigation
        1. 6.3.9.1 IMON Pin Single Point Failure
        2. 6.3.9.2 IREF Pin Single Point Failure
      10. 6.3.10 General Purpose Digital Input/Output Pins
        1. 6.3.10.1 Fault Response and Indication (FLT)
        2. 6.3.10.2 Power Good Indication (PG)
        3. 6.3.10.3 Parallel Device Synchronization (SWEN)
      11. 6.3.11 Stacking Multiple eFuses for Unlimited Scalability
        1. 6.3.11.1 Current Balancing During Start-Up
      12. 6.3.12 Quick Output Discharge(QOD)
      13. 6.3.13 Write Protect Feature(WP#)
      14. 6.3.14 PMBus® Digital Interface
        1. 6.3.14.1  PMBus® Device Addressing
        2. 6.3.14.2  SMBus Protocol
        3. 6.3.14.3  SMBus™ Message Formats
        4. 6.3.14.4  Packet Error Checking
        5. 6.3.14.5  Group Commands
        6. 6.3.14.6  SMBus™ Alert Response Address (ARA)
        7. 6.3.14.7  PMBus® Commands
        8. 6.3.14.8  Analog-to-digital Converter
        9. 6.3.14.9  Digital-to-analog Converters
        10. 6.3.14.10 DIRECT format Conversion
        11. 6.3.14.11 Blackbox Fault Recording
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Single Device, Standalone Operation
      2. 7.1.2 Single TPS1689 and multiple TPS1685 Devices, Parallel Connection
      3. 7.1.3 Multiple TPS1689 Devices: Parallel Connection With Individual Telemetry
      4. 7.1.4 Multiple Devices, Independent Operation (Multi-zone)
    2. 7.2 Typical Application: 54-V, 2-kW Power Path Protection with PMBus® Interface in Datacenter Servers
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Performance Plots
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Transient Protection
      2. 7.3.2 Output Short-Circuit Measurements
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Application Limitation and Errata
  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
    1. 11.1 Mechanical Data

Package Options

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

6.1 Overview

The TPS1689x is an eFuse with integrated power switch that is used to manage load voltage and load current. TPS1689x is equipped with a PMBus compatible digital interface which allows a host to control, configure, monitor and debug the device. The device starts the operation by monitoring the VDD and IN bus. When VDD & VIN exceed the respective Undervoltage Protection (UVP) thresholds, the device waits for the insertion delay timer duration to allow the supply to stabilize before starting up. Next, the device samples the EN/UVLO pin. As long as EN/UVLO is held low, the internal MOSFET is turned off along with the internal control/digital circuits. A high level on this pin enables the internal control circuits and prepares the PMBus engine to receive commands from the host.

After a successful start-up sequence, TPS1689x device now actively monitors the load current and input voltage, and controls the internal FET to make sure that the programmed over-current threshold ITRIP is not exceeded and overvoltage spikes are cut-off. This keeps the system safe from harmful levels of voltage and current. At the same time, a user programmable overcurrent blanking timer allows the system to pass transient peaks in the load current profile without tripping the eFuse. This maintains a robust protection against real faults which is also immune to transients, thereby maximizing system uptime.

The device has integrated protection circuits to maintain device safety and reliability under recommended operating conditions. The internal FET is protected at all time using the thermal shutdown mechanism, which turns off the FET whenever the junction temperature (Tj) becomes too hot for the device to work reliably.

The TPS1689x has integrated high accuracy and high bandwidth analog load current monitor, which allows the system to precisely monitor the load current in steady state as well as during transients. This facilitates the implementation of advanced dynamic platform power management techniques to maximize system power utilization and throughput without sacrificing safety and reliability..

The TPS1689x allows the host to monitor various system parameters and status over the PMBus interface. It’s also possible to change the device configuration over PMBus to control the device behavior as per system needs. This includes various warning/fault thresholds, timers and pin functions. The configuration values can also be stored in the internal non-volatile memory so that the device can start up with some pre-defined configuration without host intervention.

The TPS1689x also provides advanced telemetry features such as high-speed ADC sample buffering and Blackbox fault recording which facilitate system design and debug.

For systems needing higher load current support, TPS1689x can be connected in parallel with TPS1685x. The TPS16890 acts as a primary controller and enables control, telemetry and configuration of the whole chain over PMBus. Each device synchronizes the operating state to enable a graceful startup, shutdown and response to faults.