SLUSBO6C JANUARY   2014  – October 2018 TPS40425

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1. 3.1 Simplified Application Diagram (Dual Output)
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Asynchronous Pulse Injection (API)
      2. 7.3.2  Adaptive Voltage Scaling (AVS)
      3. 7.3.3  Switching Frequency and Synchronization
      4. 7.3.4  Voltage Reference
      5. 7.3.5  Output Voltage and Remote Sensing Amplifier
      6. 7.3.6  Current Sensing and Temperature Sensing Modes
        1. 7.3.6.1 Non Smart-Power Operation
        2. 7.3.6.2 Smart-Power Operation.
      7. 7.3.7  Current Sensing
      8. 7.3.8  Temperature Sensing
      9. 7.3.9  Current Sharing
      10. 7.3.10 Linear Regulators
      11. 7.3.11 Power Sequence Between TPS40425 Device and Power Stage
      12. 7.3.12 PWM Signal
        1. 7.3.12.1 PWM Behavior During Soft-start Operation
      13. 7.3.13 Startup and Shutdown
      14. 7.3.14 Pre-Biased Output Start-up
      15. 7.3.15 PGOOD Indication
      16. 7.3.16 Overcurrent Protection
      17. 7.3.17 Overvoltage/Undervoltage Protection
      18. 7.3.18 Overtemperature Fault Protection
      19. 7.3.19 Input Undervoltage Lockout (UVLO)
      20. 7.3.20 Fault Communication
      21. 7.3.21 Fault Protection Summary
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 Multi-Phase Applications
    6. 7.6 Register Maps
      1. 7.6.1 PMBus General Description
      2. 7.6.2 PMBus Functionality
        1. 7.6.2.1 PMBus Address
        2. 7.6.2.2 PMBus Connections
        3. 7.6.2.3 PMBus Data Format
        4. 7.6.2.4 PMBus Output Voltage Adjustment
          1. 7.6.2.4.1 No Margin Voltage
          2. 7.6.2.4.2 Margin High Voltage State
          3. 7.6.2.4.3 Margin Low State
      3. 7.6.3 Reading the Output Current
      4. 7.6.4 Soft-Start Time
      5. 7.6.5 Turn-On/Turn-Off Delay and Sequencing
    7. 7.7 Supported PMBus Commands
      1. 7.7.1  PAGE (00h)
      2. 7.7.2  OPERATION (01h)
      3. 7.7.3  ON_OFF_CONFIG (02h)
      4. 7.7.4  CLEAR_FAULTS (03h)
      5. 7.7.5  WRITE_PROTECT (10h)
      6. 7.7.6  STORE_USER_ALL (15h)
      7. 7.7.7  RESTORE_USER_ALL (16h)
      8. 7.7.8  CAPABILITY (19h)
      9. 7.7.9  VOUT_MODE (20h)
      10. 7.7.10 VIN_ON (35h)
      11. 7.7.11 VIN_OFF (36h)
      12. 7.7.12 IOUT_CAL_GAIN (38h)
      13. 7.7.13 IOUT_CAL_OFFSET (39h)
      14. 7.7.14 IOUT_OC_FAULT_LIMIT (46h)
      15. 7.7.15 IOUT_OC_FAULT_RESPONSE (47h)
      16. 7.7.16 IOUT_OC_WARN_LIMIT (4Ah)
      17. 7.7.17 OT_FAULT_LIMIT (4Fh)
      18. 7.7.18 OT_WARN_LIMIT (51h)
      19. 7.7.19 TON_RISE (61h)
      20. 7.7.20 STATUS_BYTE (78h)
      21. 7.7.21 STATUS_WORD (79h)
      22. 7.7.22 STATUS_VOUT (7Ah)
      23. 7.7.23 STATUS_IOUT (7Bh)
      24. 7.7.24 STATUS_TEMPERATURE (7Dh)
      25. 7.7.25 STATUS_CML (7Eh)
      26. 7.7.26 STATUS_MFR_SPECIFIC (80h)
      27. 7.7.27 READ_VOUT (8Bh)
      28. 7.7.28 READ_IOUT (8Ch)
      29. 7.7.29 READ_TEMPERATURE_2 (8Eh)
      30. 7.7.30 PMBus_REVISION (98h)
      31. 7.7.31 MFR_SPECIFIC_00 (D0h)
      32. 7.7.32 MFR_SPECIFIC_04 (VREF_TRIM) (D4h)
      33. 7.7.33 MFR_SPECIFIC_05 (STEP_VREF_MARGIN_HIGH) (D5h)
      34. 7.7.34 MFR_SPECIFIC_06 (STEP_VREF_MARGIN_LOW) (D6h)
      35. 7.7.35 MFR_SPECIFIC_07 (PCT_VOUT_FAULT_PG_LIMIT) (D7h)
      36. 7.7.36 MFR_SPECIFIC_08 (SEQUENCE_TON_TOFF_DELAY) (D8h)
      37. 7.7.37 MFR_SPECIFIC_16 (COMM_EEPROM_SPARE) (E0h)
      38. 7.7.38 MFR_SPECIFIC_21 (OPTIONS) (E5h)
      39. 7.7.39 MFR_SPECIFIC_22 (PWM_OSC_SELECT) (E6h)
      40. 7.7.40 MFR_SPECIFIC_23 (MASK SMBALERT) (E7h)
      41. 7.7.41 MFR_SPECIFIC_25 (AVS_CONFIG) (E9h)
      42. 7.7.42 MFR_SPECIFIC_26 (AVS_ADDRESS) (EAh)
      43. 7.7.43 MFR_SPECIFIC_27 (AVS_DAC_DEFAULT) (EBh)
      44. 7.7.44 MFR_SPECIFIC_28 (AVS_CLAMP_HI) (ECh)
      45. 7.7.45 MFR_SPECIFIC_29 (AVS_CLAMP_LO) (EDh)
      46. 7.7.46 MFR_SPECIFIC_30 (TEMP_OFFSET) (EEh)
      47. 7.7.47 MFR_SPECIFIC_32 (API_OPTIONS) (F0h)
      48. 7.7.48 MFR_SPECIFIC_44 (DEVICE_CODE) (FCh)
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Dual-Output Application
      2. 8.2.2 Design Requirements
      3. 8.2.3 Design Procedure
        1. 8.2.3.1  Switching Frequency Selection
        2. 8.2.3.2  Inductor Selection
        3. 8.2.3.3  Output Capacitor Selection
          1. 8.2.3.3.1 Output Voltage Deviation During Load Transient
          2. 8.2.3.3.2 Output Voltage Ripple
        4. 8.2.3.4  Input Capacitor Selection
        5. 8.2.3.5  VDD, BP5, BP3 Bypass Capacitor
        6. 8.2.3.6  R-C Snubber
        7. 8.2.3.7  Current and Temperature Sensor
        8. 8.2.3.8  Power Sequence Between the TPS40425 Device and Power Stage
        9. 8.2.3.9  Output Voltage Setting and Frequency Compensation Selection
        10. 8.2.3.10 Key PMBus Parameter Selection
          1. 8.2.3.10.1 MFR_SPECIFIC_21 (OPTIONS)
            1. 8.2.3.10.1.1 IOUT_CAL_GAIN
            2. 8.2.3.10.1.2 Enable and UVLO
            3. 8.2.3.10.1.3 Soft-Start Time
            4. 8.2.3.10.1.4 Overcurrent Threshold and Response
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Layout Guidelines for TPS40425 Device
      2. 10.1.2 Layout Guidelines for Power Stage Device
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Texas Instruments Fusion Digital Power Designer
        2. 11.1.1.2 TPS40k Loop Compensation Tool
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.7.40 MFR_SPECIFIC_23 (MASK SMBALERT) (E7h)

Format Unsigned binary
Description The MFR_SPECIFIC_23 (MASK SMBALERT) command may be used to prevent a warning or fault condition from asserting the SMBALERT signal. This command is unique in that it is partially paged; and partially common/shared – since some faults are channel dependent; and others are channel independent. The upper 8 bits of this register always controls and accesses the shared/common set of faults, regardless of the (00h) PAGE setting. However, the control and access for the lower 8 bits of this register are (00h) PAGE dependent and controls or reflects the currently selected page.

TPS40425 only provides below two options for MASK_SMBALERT setting.

● When en_auto_ARA bit (auto Alert Response Address response) is enabled, all other bits in this PMBus register need to be disabled.

● When en_auto_ARA bit is disabled, any other bits in this PMBus register can be set as desired.
Default 0000h

The default power-up state can be changed using the STORE_USER commands.
Common/Shared PAGE0, PAGE1
r/w r/wE r/wE r/wE r/wE r/wE r/w r/wE r/w r/w r/w r/w r/w r/w r/w r/wE
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
motfi mprtcl_err msmb_TO_err mivc mivd mpec mmem en_auto_ARA mOTF mOTW mOCF mOCW mOVF mUVF mPGOOD_Z mVIN_UV
Bits Field Name Description
7 motfi (Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_MFR_SPECIFIC[7]
6 mprtcl_err (Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of SMB Protocol Error from the PMBus interface module. One of 2 sources is STATUS_CML[1].
5 msmb_TO_err (Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of SMB_TIMEOUT from the PMBus interface module. One of 2 sources is STATUS_CML[1].
4 mivc (Format: binary)
Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_CML[7]
3 mivd (Format: binary)
Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_CML[6]
2 mpec (Format: binary)
Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_CML[5]
1 mmem (Format: binary)
Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_CML[4]
0 en_auto_ARA (Format: binary)

Default: 0b

Enables auto Alert Response Address response. When this feature is enabled, the hardware automatically masks any fault source currently set from re-asserting SMB_ALERT when this TPS40425 device responds to an ARA on the PMBus. This prevents PMBus “bus hogging” in the case of a persistent fault in a device that consistently wins ARA arbitration due to its device address. In contrast, when this bit is cleared, immediate re-assertion of SMB_ALERT is allowed in the event of a persistent fault and the responsibility is upon the host to mask each source individually. When WRITE_PROTECT is set to 20h, 40h or 80h, en_auto_ARA is enabled automatically.
7 mOTF Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_TEMPERATURE[7]
6 mOTW Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_TEMPERATURE[6]
5 mOCF Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_IOUT[7]
4 mOCW Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_IOUT[5]
3 mOVF Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_VOUT[7]
2 mUVF Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_VOUT[4]
1 mPGOOD_Z Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_WORD[11]
0 mVIN_UV Functionality of mask bit:

(Format: binary)

Default: 0b

0: No effect upon SMBALERT

1: Masks SMBALERT assertion due to setting of STATUS_BYTE[3]