SLVSHK9 December   2024 TPS546B26

PRODUCTION DATA  

  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
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  D-CAP4 Control
        1. 6.3.1.1 Loop Compensation
      2. 6.3.2  Internal VCC LDO and Using an External Bias on VCC Pin and VDRV Pin
      3. 6.3.3  Input Undervoltage Lockout (UVLO)
        1. 6.3.3.1 Fixed VCC_OK UVLO
        2. 6.3.3.2 Fixed VDRV UVLO
        3. 6.3.3.3 Programmable PVIN UVLO
        4. 6.3.3.4 Control (CNTL) Enable
      4. 6.3.4  Differential Remote Sense and Internal, External Feedback Divider
      5. 6.3.5  Set the Output Voltage and VORST#
      6. 6.3.6  Start-Up and Shutdown
      7. 6.3.7  Dynamic Voltage Slew Rate
      8. 6.3.8  Set Switching Frequency
      9. 6.3.9  Switching Node (SW)
      10. 6.3.10 Overcurrent Limit and Low-side Current Sense
      11. 6.3.11 Negative Overcurrent Limit
      12. 6.3.12 Zero-Crossing Detection
      13. 6.3.13 Input Overvoltage Protection
      14. 6.3.14 Output Overvoltage and Undervoltage Protection
      15. 6.3.15 Overtemperature Protection
      16. 6.3.16 Telemetry
    4. 6.4 Device Functional Modes
      1. 6.4.1 Forced Continuous-Conduction Mode
      2. 6.4.2 DCM Light Load Operation
      3. 6.4.3 Powering the Device From a 12V Bus
      4. 6.4.4 Powering the Device From a Split-rail Configuration
      5. 6.4.5 Pin-Strapping
        1. 6.4.5.1 Programming MSEL1
        2. 6.4.5.2 Programming PMB_ADDR
        3. 6.4.5.3 Programming MSEL2
        4. 6.4.5.4 Programming VSEL\FB
    5. 6.5 Programming
      1. 6.5.1 Supported PMBus® Commands
  8. 7 Register Maps
    1. 7.1  Conventions for Documenting Block Commands
    2. 7.2  (01h) OPERATION
    3. 7.3  (02h) ON_OFF_CONFIG
    4. 7.4  (03h) CLEAR_FAULTS
    5. 7.5  (0Eh) PASSKEY
    6. 7.6  (10h) WRITE_PROTECT
    7. 7.7  (15h) STORE_USER_ALL
    8. 7.8  (16h) RESTORE_USER_ALL
    9. 7.9  (19h) CAPABILITY
    10. 7.10 (1Bh) SMBALERT_MASK
    11. 7.11 (20h) VOUT_MODE
    12. 7.12 (21h) VOUT_COMMAND
    13. 7.13 (22h) VOUT_TRIM
    14. 7.14 (24h) VOUT_MAX
    15. 7.15 (25h) VOUT_MARGIN_HIGH
    16. 7.16 (26h) VOUT_MARGIN_LOW
    17. 7.17 (27h) VOUT_TRANSITION_RATE
    18. 7.18 (29h) VOUT_SCALE_LOOP
    19. 7.19 (2Ah) VOUT_SCALE_MONITOR
    20. 7.20 (2Bh) VOUT_MIN
    21. 7.21 (33h) FREQUENCY_SWITCH
    22. 7.22 (35h) VIN_ON
    23. 7.23 (36h) VIN_OFF
    24. 7.24 (39h) IOUT_CAL_OFFSET
    25. 7.25 (40h) VOUT_OV_FAULT_LIMIT
    26. 7.26 (41h) VOUT_OV_FAULT_RESPONSE
    27. 7.27 (42h) VOUT_OV_WARN_LIMIT
    28. 7.28 (43h) VOUT_UV_WARN_LIMIT
    29. 7.29 (44h) VOUT_UV_FAULT_LIMIT
    30. 7.30 (45h) VOUT_UV_FAULT_RESPONSE
    31. 7.31 (46h) IOUT_OC_FAULT_LIMIT
    32. 7.32 (48h) IOUT_OC_LV_FAULT_LIMIT
    33. 7.33 (49h) IOUT_OC_LV_FAULT_RESPONSE
    34. 7.34 (4Ah) IOUT_OC_WARN_LIMIT
    35. 7.35 (4Fh) OT_FAULT_LIMIT
    36. 7.36 (50h) OT_FAULT_RESPONSE
    37. 7.37 (51h) OT_WARN_LIMIT
    38. 7.38 (55h) VIN_OV_FAULT_LIMIT
    39. 7.39 (60h) TON_DELAY
    40. 7.40 (61h) TON_RISE
    41. 7.41 (64h) TOFF_DELAY
    42. 7.42 (65h) TOFF_FALL
    43. 7.43 (78h) STATUS_BYTE
    44. 7.44 (79h) STATUS_WORD
    45. 7.45 (7Ah) STATUS_VOUT
    46. 7.46 (7Bh) STATUS_IOUT
    47. 7.47 (7Ch) STATUS_INPUT
    48. 7.48 (7Dh) STATUS_TEMPERATURE
    49. 7.49 (7Eh) STATUS_CML
    50. 7.50 (7Fh) STATUS_OTHER
    51. 7.51 (80h) STATUS_MFR_SPECIFIC
    52. 7.52 (88h) READ_VIN
    53. 7.53 (8Bh) READ_VOUT
    54. 7.54 (8Ch) READ_IOUT
    55. 7.55 (8Dh) READ_TEMPERATURE_1
    56. 7.56 (98h) PMBUS_REVISION
    57. 7.57 (99h) MFR_ID
    58. 7.58 (9Ah) MFR_MODEL
    59. 7.59 (9Bh) MFR_REVISION
    60. 7.60 (ADh) IC_DEVICE_ID
    61. 7.61 (AEh) IC_DEVICE_REV
    62. 7.62 (D1h) SYS_CFG_USER1
    63. 7.63 (D3h) PMBUS_ADDR
    64. 7.64 (D4h) COMP
    65. 7.65 (D5h) VBOOT_OFFSET_1
    66. 7.66 (D8h) PIN_DETECT_OVERRIDE
    67. 7.67 (D9h) NVM_CHECKSUM
    68. 7.68 (DAh) READ_TELEMETRY
    69. 7.69 (DBh) STATUS_ALL
    70. 7.70 (DDh) EXT_WRITE_PROTECTION
    71. 7.71 (DEh) IMON_CAL
    72. 7.72 (FCh) FUSION_ID0
    73. 7.73 (FDh) FUSION_ID1
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Input Capacitor Selection
        2. 8.2.3.2 Inductor Selection
        3. 8.2.3.3 Output Capacitor Selection
        4. 8.2.3.4 Compensation Selection
        5. 8.2.3.5 VCC and VRDV Bypass Capacitors
        6. 8.2.3.6 BOOT Capacitor Selection
        7. 8.2.3.7 VOSNS and GOSNS Capacitor Selection
        8. 8.2.3.8 PMBus Address Resistor Selection
      4. 8.2.4 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
        1. 8.4.2.1 Thermal Performance on EVM
  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

6.4.5 Pin-Strapping

The device provides four IC pins that allow the initial PMBus programming value on critical PMBus commands to be selected by the resistors connected to that pin without requiring PMBus communication. Whether a specific PMBus command is initialized to the value selected by the detected resistance or stored NVM memory is determined by the commands bit in the PIN_DETECT_OVERRIDE Command.

Check PIN_DETECT_OVERRIDE default value in Supported PMBus® Commands for which functions are using pin detection or NVM by default.

Function Pin Used for Pin-strap Pin-strap Order

Primary

Internal or external feedback divider

Overcurrent limit (OCL)

Soft start

Fault response

 MSEL1 1

Primary:

Phase quantity

Mode (FCCM/DCM)

Primary (Common) PMBus address

 PMB_ADDR 2

Secondary:

Phase location

Unique PMBus address

Primary:

Switching frequency (FSW)

RAMP

GAIN

 MSEL2 3

Switching frequency (FSW)

Overcurrent limit (OCL)

Primary when internal feedback divider is used:

VOUT

VOSL

NRSA

VOUT_MAX

VOUT_MIN

Note: pin-strap is not used when external feedback divider is selected with MSEL1, and the pin becomes FB

 VSEL/FB 4
Note:

The high precision pin-detection programming can be sensitive to PCB contamination from flux, moisture, and debris. As such, users must consider committing pin programmed values to user non-volatile memory and disable future use of pin-strapped values as part of the product flow. The programming sequence to commit pin programmed PMBus register values to NVM and disable future use of pin-strapped programming is:

  • Select MSEL1, MSEL2, VSEL, and PMB_ADDR programming resistors to program the desired PMBus register values.
  • Power VIN and VCC and VDRV above the UVLOs to initiate pin-detection and enable PMBus communication.
  • Update any PMBus register values not programmed to the final value by pin-detection.
  • Read the full PMBus registers.
  • Perform a STORE/RESTORE.
  • Allow a minimum 100ms for the device to complete a burn of NVM User Store. Loss of AVIN or VCC power during this 100ms can compromise the integrity of the NVM. Failure to complete the NVM burn can result in a corruption of NVM and a POR fault on subsequent power on resets.
  • Perform a power reset by lowering VCC below the UVLO off threshold, then raising VCC above the UVLO on threshold.