SLVSHO1A March   2025  – December 2025 TPS1689

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  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  Telemetry
    7. 6.7  PMBus and GPIO DC Characteristics
    8. 6.8  Logic Interface
    9. 6.9  Timing Requirements
    10. 6.10 Switching Characteristics
    11. 6.11 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 Timeout
        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  Overtemperature Protection
      7. 7.3.7  Analog Junction Temperature Monitor (TEMP)
      8. 7.3.8  FET Health Monitoring
      9. 7.3.9  Single Point Failure Mitigation
        1. 7.3.9.1 IMON Pin Single Point Failure
        2. 7.3.9.2 IREF Pin Single Point Failure
      10. 7.3.10 General Purpose Digital Input/Output Pins
        1. 7.3.10.1 Fault Response and Indication (FLT)
        2. 7.3.10.2 Power Good Indication (PG)
        3. 7.3.10.3 Parallel Device Synchronization (SWEN)
      11. 7.3.11 Stacking Multiple eFuses for Unlimited Scalability
        1. 7.3.11.1 Current Balancing During Start-Up
      12. 7.3.12 Quick Output Discharge(QOD)
      13. 7.3.13 Write Protect Feature(WP#)
      14. 7.3.14 PMBus® Digital Interface
        1. 7.3.14.1  PMBus® Device Addressing
        2. 7.3.14.2  SMBus Protocol
        3. 7.3.14.3  SMBus™ Message Formats
        4. 7.3.14.4  Packet Error Checking
        5. 7.3.14.5  Group Commands
        6. 7.3.14.6  SMBus™ Alert Response Address (ARA)
        7. 7.3.14.7  PMBus® Commands
          1. 7.3.14.7.1 Detailed Descriptions of PMBus® Commands
            1. 7.3.14.7.1.1  OPERATION (01h, Read/Write Byte)
            2. 7.3.14.7.1.2  CLEAR_FAULTS (03h, Send Byte)
            3. 7.3.14.7.1.3  RESTORE_FACTORY_DEFAULTS (12h, Send Byte)
            4. 7.3.14.7.1.4  STORE_USER_ALL (15h, Send Byte)
            5. 7.3.14.7.1.5  RESTORE_USER_ALL (16h, Send Byte)
            6. 7.3.14.7.1.6  BB_ERASE (F5h, Send Byte)
            7. 7.3.14.7.1.7  FETCH_BB_EEPROM (F6h, Send Byte)
            8. 7.3.14.7.1.8  CLEAR_BB_RAM (FCh, Send Byte)
            9. 7.3.14.7.1.9  POWER_CYCLE (D9h, Send Byte)
            10. 7.3.14.7.1.10 MFR_WRITE_PROTECT (F8h, Read/Write Byte)
            11. 7.3.14.7.1.11 CAPABILITY (19h, Read Byte)
            12. 7.3.14.7.1.12 STATUS_BYTE (78h, Read Byte)
            13. 7.3.14.7.1.13 STATUS_WORD (79h, Read Word)
            14. 7.3.14.7.1.14 STATUS_OUT (7Ah, Read Byte)
            15. 7.3.14.7.1.15 STATUS_IOUT (7Bh, Read Byte)
            16. 7.3.14.7.1.16 STATUS_INPUT (7Ch, Read Byte)
            17. 7.3.14.7.1.17 STATUS_TEMP (7Dh, Read Byte)
            18. 7.3.14.7.1.18 STATUS_CML (7Eh, Read Byte)
            19. 7.3.14.7.1.19 STATUS_MFR_SPECIFIC (80h, Read Byte)
            20. 7.3.14.7.1.20 STATUS_MFR_SPECIFIC_2 (F3h, Read Word)
            21. 7.3.14.7.1.21 PMBUS_REVISION (98h, Read Byte)
            22. 7.3.14.7.1.22 MFR_ID (99h, Block Read)
            23. 7.3.14.7.1.23 MFR_MODEL (9Ah, Block Read)
            24. 7.3.14.7.1.24 MFR_REVISION (9Bh, Block Read)
            25. 7.3.14.7.1.25 READ_VIN (88h, Read Word)
            26. 7.3.14.7.1.26 READ_VOUT (8Bh, Read Word)
            27. 7.3.14.7.1.27 READ_IIN (89h, Read Word)
            28. 7.3.14.7.1.28 READ_TEMPERATURE_1 (8Dh, Read Word)
            29. 7.3.14.7.1.29 READ_VAUX (D0h, Read Word)
            30. 7.3.14.7.1.30 READ_PIN (97h, Read Word)
            31. 7.3.14.7.1.31 READ_EIN (86h, Block Read)
            32. 7.3.14.7.1.32 READ_VIN_AVG (DCh, Read Word)
            33. 7.3.14.7.1.33 READ_VIN_MIN (D1h, Read Word)
            34. 7.3.14.7.1.34 READ_VIN_PEAK (D2h, Read Word)
            35. 7.3.14.7.1.35 READ_VOUT_AVG (DDh, Read Word)
            36. 7.3.14.7.1.36 READ_VOUT_MIN (DAh, Read Word)
            37. 7.3.14.7.1.37 READ_IIN_AVG (DEh, Read Word)
            38. 7.3.14.7.1.38 READ_IIN_PEAK (D4h, Read Word)
            39. 7.3.14.7.1.39 READ_TEMP_AVG (D6h, Read Word)
            40. 7.3.14.7.1.40 READ_TEMP_PEAK (D7h, Read Word)
            41. 7.3.14.7.1.41 READ_PIN_AVG (DFh, Read Word)
            42. 7.3.14.7.1.42 READ_PIN_PEAK (D5h, Read Word)
            43. 7.3.14.7.1.43 READ_SAMPLE_BUF (D8h, Block Read)
            44. 7.3.14.7.1.44 READ_BB_RAM (FDh, Block Read)
            45. 7.3.14.7.1.45 READ_BB_EEPROM (F4h, Block Read)
            46. 7.3.14.7.1.46 BB_TIMER (FAh, Read Byte)
            47. 7.3.14.7.1.47 PMBUS_ADDR (FBh, Read/Write Byte)
            48. 7.3.14.7.1.48 VIN_UV_WARN (58h, Read/Write Word)
            49. 7.3.14.7.1.49 VIN_UV_FLT (59h, Read/Write Word)
            50. 7.3.14.7.1.50 VIN_OV_WARN (57h, Read/Write Word)
            51. 7.3.14.7.1.51 VIN_OV_FLT (55h, Read/Write Word)
            52. 7.3.14.7.1.52 VOUT_UV_WARN (43h, Read/Write Word)
            53. 7.3.14.7.1.53 VOUT_PGTH (5Fh, Read/Write Word)
            54. 7.3.14.7.1.54 OT_WARN (51h, Read/Write Word)
            55. 7.3.14.7.1.55 OT_FLT (4Fh, Read/Write Word)
            56. 7.3.14.7.1.56 PIN_OP_WARN (6Bh, Read/Write Word)
            57. 7.3.14.7.1.57 IIN_OC_WARN (5Dh, Read/Write Word)
            58. 7.3.14.7.1.58 ALERT_MASK (DBh, Read/Write Word)
            59. 7.3.14.7.1.59 VIREF (E0h, Read/Write Byte)
            60. 7.3.14.7.1.60 AUX/TEMP/EEDATA/EECLK/GPIOx (E1h, Read/Write Byte)
            61. 7.3.14.7.1.61 SMBA_FLT_CONFIG (E2h, Read/Write Byte)
            62. 7.3.14.7.1.62 FAULT_MASK (E3h, Read/Write Word)
            63. 7.3.14.7.1.63 DEVICE_CONFIG (E4h, Read/Write Word)
            64. 7.3.14.7.1.64 BB_CONFIG (E5h, Read/Write Byte)
            65. 7.3.14.7.1.65 OC_TIMER (E6h, Read/Write Byte)
            66. 7.3.14.7.1.66 RETRY_CONFIG (E7h, Read/Write Byte)
            67. 7.3.14.7.1.67 ADC_CONFIG_1 (E8h, Read/Write Byte)
            68. 7.3.14.7.1.68 ADC_CONFIG_2 (E9h, Read/Write Byte)
            69. 7.3.14.7.1.69 PK_MIN_AVG (EAh, Read/Write Byte)
            70. 7.3.14.7.1.70 PSU_VOLTAGE (ECh, Read/Write Byte)
            71. 7.3.14.7.1.71 CABLE_DROP (EDh, Read/Write Byte)
            72. 7.3.14.7.1.72 IMON OFFSET CALIBRATION (F2h, Read/Write Byte)
            73. 7.3.14.7.1.73 INS_DLY (F9h, Read/Write Byte)
        8. 7.3.14.8  Analog-to-Digital Converter
        9. 7.3.14.9  Digital-to-Analog Converters
        10. 7.3.14.10 DIRECT Format Conversion
        11. 7.3.14.11 Blackbox Fault Recording
    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 Single TPS1689x and Multiple TPS1685 Devices, Parallel Connection
      3. 8.1.3 Multiple TPS1689x Devices: Parallel Connection With Individual Telemetry
      4. 8.1.4 Multiple Devices, Independent Operation (Multi-zone)
    2. 8.2 Typical Application: 54V, 2kW Power Path Protection with PMBus® Interface in Datacenter Servers
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Performance Plots
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Transient Protection and Other Design Considerations
      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

7.3.11.1 Current Balancing During Start-Up

The TPS1689x implements a proprietary current balancing mechanism during start-up, which allows TPS1689x and TPS1685x devices connected in parallel to share the inrush current and distribute the thermal stress across all the devices. This feature helps to complete a successful start-up with all the devices and avoid a scenario where some of the eFuses hit thermal shutdown prematurely. This in effect increases the inrush current capability of the parallel chain. The improved inrush performance makes it possible to support very large load capacitors on high current platforms without compromising the inrush time or system reliability.