SLVSGG4B september   2022  – june 2023 TPS25990

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Description (continued)
  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 DC Characteristics
    7. 7.7  Telemetry
    8. 7.8  PMBus Interface Timing Characteristics
    9. 7.9  External EEPROM Interface Timing Characteristics
    10. 7.10 Timing Requirements
    11. 7.11 Switching Characteristics
    12. 7.12 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 Timeout
        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  Single Point Failure Mitigation
        1. 8.3.5.1 IMON Pin Single Point Failure
        2. 8.3.5.2 ILIM Pin Single Point Failure
        3. 8.3.5.3 IREF Pin Single Point Failure
      6. 8.3.6  Analog Load Current Monitor (IMON)
      7. 8.3.7  Overtemperature Protection
      8. 8.3.8  Analog Junction Temperature Monitor (TEMP)
      9. 8.3.9  FET Health Monitoring
      10. 8.3.10 General Purpose Digital Input/Output Pins
        1. 8.3.10.1 Fault Response and Indication (FLT)
        2. 8.3.10.2 Power Good Indication (PG)
        3. 8.3.10.3 Parallel Device Synchronization (SWEN)
      11. 8.3.11 Stacking Multiple eFuses for Unlimited Scalability
        1. 8.3.11.1 Current Balancing During Start-Up
      12. 8.3.12 General Purpose Comparators
      13. 8.3.13 Output Discharge
      14. 8.3.14 PMBus® Digital Interface
        1. 8.3.14.1  PMBus® Device Addressing
        2. 8.3.14.2  SMBus Protocol
        3. 8.3.14.3  SMBus™ Message Formats
        4. 8.3.14.4  Packet Error Checking
        5. 8.3.14.5  Group Commands
        6. 8.3.14.6  SMBus™ Alert Response Address (ARA)
        7. 8.3.14.7  PMBus® Commands
          1. 8.3.14.7.1 Detailed Descriptions of PMBus® Commands
            1. 8.3.14.7.1.1  OPERATION (01h, Read/Write Byte)
            2. 8.3.14.7.1.2  CLEAR_FAULTS (03h, Send Byte)
            3. 8.3.14.7.1.3  RESTORE_FACTORY_DEFAULTS (12h, Send Byte)
            4. 8.3.14.7.1.4  STORE_USER_ALL (15h, Send Byte)
            5. 8.3.14.7.1.5  RESTORE_USER_ALL (16h, Send Byte)
            6. 8.3.14.7.1.6  BB_ERASE (F5h, Send Byte)
            7. 8.3.14.7.1.7  FETCH_BB_EEPROM (F6h, Send Byte)
            8. 8.3.14.7.1.8  POWER_CYCLE (D9h, Send Byte)
            9. 8.3.14.7.1.9  MFR_WRITE_PROTECT (F8h, Read/Write Byte)
            10. 8.3.14.7.1.10 CAPABILITY (19h, Read Byte)
            11. 8.3.14.7.1.11 STATUS_BYTE (78h, Read Byte)
            12. 8.3.14.7.1.12 STATUS_WORD (79h, Read Word)
            13. 8.3.14.7.1.13 STATUS_OUT (7Ah, Read Byte)
            14. 8.3.14.7.1.14 STATUS_IOUT (7Bh, Read Byte)
            15. 8.3.14.7.1.15 STATUS_INPUT (7Ch, Read Byte)
            16. 8.3.14.7.1.16 STATUS_TEMP (7Dh, Read Byte)
            17. 8.3.14.7.1.17 STATUS_CML (7Eh, Read Byte)
            18. 8.3.14.7.1.18 STATUS_MFR_SPECIFIC (80h, Read Byte)
            19. 8.3.14.7.1.19 STATUS_MFR_SPECIFIC_2 (F3h, Read Word)
            20. 8.3.14.7.1.20 PMBUS_REVISION (98h, Read Byte)
            21. 8.3.14.7.1.21 MFR_ID (99h, Block Read)
            22. 8.3.14.7.1.22 MFR_MODEL (9Ah, Block Read)
            23. 8.3.14.7.1.23 MFR_REVISION (9Bh, Block Read)
            24. 8.3.14.7.1.24 READ_VIN (88h, Read Word)
            25. 8.3.14.7.1.25 READ_VOUT (8Bh, Read Word)
            26. 8.3.14.7.1.26 READ_IIN (89h, Read Word)
            27. 8.3.14.7.1.27 READ_TEMPERATURE_1 (8Dh, Read Word)
            28. 8.3.14.7.1.28 READ_VAUX (D0h, Read Word)
            29. 8.3.14.7.1.29 READ_PIN (97h, Read Word)
            30. 8.3.14.7.1.30 READ_EIN (86h, Block Read)
            31. 8.3.14.7.1.31 READ_VIN_AVG (DCh, Read Word)
            32. 8.3.14.7.1.32 READ_VIN_MIN (D1h, Read Word)
            33. 8.3.14.7.1.33 READ_VIN_PEAK (D2h, Read Word)
            34. 8.3.14.7.1.34 READ_VOUT_AVG (DDh, Read Word)
            35. 8.3.14.7.1.35 READ_VOUT_MIN (DAh, Read Word)
            36. 8.3.14.7.1.36 READ_IIN_AVG (DEh, Read Word)
            37. 8.3.14.7.1.37 READ_IIN_PEAK (D4h, Read Word)
            38. 8.3.14.7.1.38 READ_TEMP_AVG (D6h, Read Word)
            39. 8.3.14.7.1.39 READ_TEMP_PEAK (D7h, Read Word)
            40. 8.3.14.7.1.40 READ_PIN_AVG (DFh, Read Word)
            41. 8.3.14.7.1.41 READ_PIN_PEAK (D5h, Read Word)
            42. 8.3.14.7.1.42 READ_SAMPLE_BUF (D8h, Block Read)
            43. 8.3.14.7.1.43 READ_BB_RAM (FDh, Block Read)
            44. 8.3.14.7.1.44 READ_BB_EEPROM (F4h, Block Read)
            45. 8.3.14.7.1.45 BB_TIMER (FAh, Read Byte)
            46. 8.3.14.7.1.46 PMBUS_ADDR (FBh, Read/Write Byte)
            47. 8.3.14.7.1.47 VIN_UV_WARN (58h, Read/Write Word)
            48. 8.3.14.7.1.48 VIN_UV_FLT (59h, Read/Write Word)
            49. 8.3.14.7.1.49 VIN_OV_WARN (57h, Read/Write Word)
            50. 8.3.14.7.1.50 VIN_OV_FLT (55h, Read/Write Word)
            51. 8.3.14.7.1.51 VOUT_UV_WARN (43h, Read/Write Word)
            52. 8.3.14.7.1.52 VOUT_PGTH (5Fh, Read/Write Word)
            53. 8.3.14.7.1.53 OT_WARN (51h, Read/Write Word)
            54. 8.3.14.7.1.54 OT_FLT (4Fh, Read/Write Word)
            55. 8.3.14.7.1.55 PIN_OP_WARN (6Bh, Read/Write Word)
            56. 8.3.14.7.1.56 IIN_OC_WARN (5Dh, Read/Write Word)
            57. 8.3.14.7.1.57 VIREF (E0h, Read/Write Byte)
            58. 8.3.14.7.1.58 GPIO_CONFIG_12 (E1h, Read/Write Byte)
            59. 8.3.14.7.1.59 GPIO_CONFIG_34 (E2h, Read/Write Byte)
            60. 8.3.14.7.1.60 ALERT_MASK (DBh, Read/Write Word)
            61. 8.3.14.7.1.61 FAULT_MASK (E3h, Read/Write Word)
            62. 8.3.14.7.1.62 DEVICE_CONFIG (E4h, Read/Write Word)
            63. 8.3.14.7.1.63 BB_CONFIG (E5h, Read/Write Byte)
            64. 8.3.14.7.1.64 OC_TIMER (E6h, Read/Write Byte)
            65. 8.3.14.7.1.65 RETRY_CONFIG (E7h, Read/Write Byte)
            66. 8.3.14.7.1.66 ADC_CONFIG_1 (E8h, Read/Write Byte)
            67. 8.3.14.7.1.67 ADC_CONFIG_2 (E9h, Read/Write Byte)
            68. 8.3.14.7.1.68 PK_MIN_AVG (EAh, Read/Write Byte)
            69. 8.3.14.7.1.69 VCMPxREF (EBh, Read/Write Byte)
            70. 8.3.14.7.1.70 PSU_VOLTAGE (ECh, Read/Write Byte)
            71. 8.3.14.7.1.71 CABLE_DROP (EDh, Read/Write Byte)
            72. 8.3.14.7.1.72 GPDAC1 (F0h, Read/Write Byte)
            73. 8.3.14.7.1.73 GPDAC2 (F1h, Read/Write Byte)
            74. 8.3.14.7.1.74 INS_DLY (F9h, Read/Write Byte)
        8. 8.3.14.8  Analog-to-digital Converter
        9. 8.3.14.9  Digital-to-analog Converters
        10. 8.3.14.10 DIRECT format Conversion
        11. 8.3.14.11 Blackbox Fault Recording
    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 Devices, Independent Operation (Multi-zone)
    2. 9.2 Typical Application: 12-V, 4-kW Power Path Protection with PMBus® Interface in Datacenter Servers
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Performance Plots
    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 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
8.3.14.7.1.71 CABLE_DROP (EDh, Read/Write Byte)

CABLE_DROP is a manufacturer-specific command that allows configuring or reading an 8-bit reference threshold for the maximum cable voltage drop expected to implement the input cable fault detection feature. This command uses the PMBus® DIRECT format. When reading and writing to this register, use the coefficients shown in Table 8-67, Equation 19, and Equation 20.

This command uses the PMBus® read or write byte protocol.

Contents of this register are compared with the difference between PSU_VOLTAGE and VIN ADC telemetry values. If this difference value exceeds the value in the CABLE_DROP register, the VIN_CABLE_FAULT flags are set in the respective registers. The SMBA# signal is asserted. When the difference between PSU_VOLTAGE and VIN ADC telemetry value falls below the CABLE_DROP threshold, and the CLEAR_FAULTS command is sent afterwards, this warning flag and alart are cleared. The details of this register are shown in Table 9-69.

Table 8-63 CABLE_DROP Register Description
BitName

Description

Minimum Value

Maximum Value

Default Value

Access

7:0

CABLE_DROP

Maximum cable voltage drop expected

0x00h (0 V)

0xFFh (4.845 V)

0xFFh (4.845 V)

Read/Write

When the input cable fault is detected, the device:

  • sets the NONE_OF_THE_ABOVE/UNKNOWN bit in the STATUS_BYTE register

  • sets the NONE_OF_THE_ABOVE/UNKNOWN bit in the upper byte of the STATUS_WORD register

  • sets the VIN_CABLE_FLT bit in the STATUS_MFR_SPECIFIC_2 register

  • notifies the host asserting SMBA#, if it is not masked setting the UNKNOWN bit low in the ALERT_MASK register

Note:

A write command to this register should be preceded by the MFR_WRITE_PROTECT command to unlock the device first to prevent accidental accidental/spurious writes.