SLUSBV0A May   2014  – JULY 2014 TPS40428

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 TPS40428 Device and Power Stage
      12. 7.3.12 PWM Signal
      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 Output 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
        5. 7.6.2.5 Reading the Output Current
        6. 7.6.2.6 Soft-Start Time
        7. 7.6.2.7 Turn-On/Turn-Off Delay and Sequencing
        8. 7.6.2.8 Supported PMBus Commands
          1. 7.6.2.8.1  PAGE (00h)
          2. 7.6.2.8.2  OPERATION (01h)
          3. 7.6.2.8.3  ON_OFF_CONFIG (02h)
          4. 7.6.2.8.4  CLEAR_FAULTS (03h)
          5. 7.6.2.8.5  WRITE_PROTECT (10h)
          6. 7.6.2.8.6  STORE_USER_ALL (15h)
          7. 7.6.2.8.7  RESTORE_USER_ALL (16h)
          8. 7.6.2.8.8  CAPABILITY (19h)
          9. 7.6.2.8.9  VOUT_MODE (20h)
          10. 7.6.2.8.10 VIN_ON (35h)
          11. 7.6.2.8.11 VIN_OFF (36h)
          12. 7.6.2.8.12 IOUT_CAL_GAIN (38h)
          13. 7.6.2.8.13 IOUT_CAL_OFFSET (39h)
          14. 7.6.2.8.14 IOUT_OC_FAULT_LIMIT (46h)
          15. 7.6.2.8.15 IOUT_OC_FAULT_RESPONSE (47h)
          16. 7.6.2.8.16 IOUT_OC_WARN_LIMIT (4Ah)
          17. 7.6.2.8.17 OT_FAULT_LIMIT (4Fh)
          18. 7.6.2.8.18 OT_WARN_LIMIT (51h)
          19. 7.6.2.8.19 TON_RISE (61h)
          20. 7.6.2.8.20 STATUS_BYTE (78h)
          21. 7.6.2.8.21 STATUS_WORD (79h)
          22. 7.6.2.8.22 STATUS_VOUT (7Ah)
          23. 7.6.2.8.23 STATUS_IOUT (7Bh)
          24. 7.6.2.8.24 STATUS_TEMPERATURE (7Dh)
          25. 7.6.2.8.25 STATUS_CML (7Eh)
          26. 7.6.2.8.26 STATUS_MFR_SPECIFIC (80h)
          27. 7.6.2.8.27 READ_VOUT (8Bh)
          28. 7.6.2.8.28 READ_IOUT (8Ch)
          29. 7.6.2.8.29 READ_TEMPERATURE_2 (8Eh)
          30. 7.6.2.8.30 PMBus_REVISION (98h)
          31. 7.6.2.8.31 MFR_SPECIFIC_00 (D0h)
          32. 7.6.2.8.32 MFR_SPECIFIC_04 (VREF_TRIM) (D4h)
          33. 7.6.2.8.33 MFR_SPECIFIC_05 (STEP_VREF_MARGIN_HIGH) (D5h)
          34. 7.6.2.8.34 MFR_SPECIFIC_06 (STEP_VREF_MARGIN_LOW) (D6h)
          35. 7.6.2.8.35 MFR_SPECIFIC_07 (PCT_VOUT_FAULT_PG_LIMIT) (D7h)
          36. 7.6.2.8.36 MFR_SPECIFIC_08 (SEQUENCE_TON_TOFF_DELAY) (D8h)
          37. 7.6.2.8.37 (E0h) MFR_SPECIFIC_16 (COMM_EEPROM_SPARE)
          38. 7.6.2.8.38 MFR_SPECIFIC_21 (OPTIONS) (E5h)
          39. 7.6.2.8.39 MFR_SPECIFIC_22 (PWM_OSC_SELECT) (E6h)
          40. 7.6.2.8.40 MFR_SPECIFIC_23 (MASK SMBALERT) (E7h)
          41. 7.6.2.8.41 MFR_SPECIFIC_25 (AVS_CONFIG) (E9h)
          42. 7.6.2.8.42 MFR_SPECIFIC_26 (AVS_ADDRESS) (EAh)
          43. 7.6.2.8.43 MFR_SPECIFIC_27 (AVS_DAC_DEFAULT) (EBh)
          44. 7.6.2.8.44 MFR_SPECIFIC_28 (AVS_CLAMP_HI) (ECh)
          45. 7.6.2.8.45 MFR_SPECIFIC_29 (AVS_CLAMP_LO) (EDh)
          46. 7.6.2.8.46 MFR_SPECIFIC_30 (TEMP_OFFSET) (EEh)
          47. 7.6.2.8.47 MFR_SPECIFIC_32 (API_OPTIONS) (F0h)
          48. 7.6.2.8.48 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 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Switching Frequency Selection
        2. 8.2.2.2  Inductor Selection
        3. 8.2.2.3  Output Capacitor Selection
          1. 8.2.2.3.1 Output Voltage Deviation During Load Transient
          2. 8.2.2.3.2 Output Voltage Ripple
        4. 8.2.2.4  Input Capacitor Selection
        5. 8.2.2.5  VDD, BP5, BP3 Bypass Capacitor
        6. 8.2.2.6  R-C Snubber
        7. 8.2.2.7  Current and Temperature Sensor
        8. 8.2.2.8  Power Sequence Between the TPS40428 Device and Power Stage
        9. 8.2.2.9  Output Voltage Setting and Frequency Compensation Selection
        10. 8.2.2.10 Key PMBus Parameter Selection
          1. 8.2.2.10.1 MFR_SPECIFIC_21 (OPTIONS)
            1. 8.2.2.10.1.1 IOUT_CAL_GAIN
            2. 8.2.2.10.1.2 Enable and UVLO
            3. 8.2.2.10.1.3 Soft-Start Time
            4. 8.2.2.10.1.4 Overcurrent Threshold and Response
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Layout Guidelines for TPS40428 Device
      2. 10.1.2 Layout Guidelines for the Power Stage Device
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Development Support
      1. 11.1.1 Texas Instruments Fusion Digital Power Designer
      2. 11.1.2 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

11 Device and Documentation Support

11.1 Development Support

11.1.1 Texas Instruments Fusion Digital Power Designer

The TPS40428 device is fully supported by Texas Instruments Digital Power Designer. Fusion digital Power Designer is a graphical user interface (GUI) which can be used to configure and monitor the TPS40428 device via PMBus using a Texas Instruments USB-to-GPIO adaptor.

Click this link to download the Texas Instruments Fusion Digital Power Designer software package.

dpd_config_slusbv0_p.pngFigure 33. Device Configuration with Fusion Digital Power Designer
dpd_monitor_slusbv0_p.pngFigure 34. Device Monitoring with Fusion Digital Power Designer

11.1.2 TPS40k Loop Compensation Tool

At dual-output application, the TPS40428 device is a voltage mode controller; it is supported by the Texas Instruments TPS40k Loop Compensation Tool. The spreadsheet tool can be used to calculate frequency compensation components.

For multi-phase applications, the current information is applied to control loop to achieve current sharing between phases, the TPS40428 device is not a pure voltage mode controller any more. The compensation components value calculated in the spreadsheet tool can be used as a starting point.

Due to the component variation, PCB parasitic impedance, and layout impact, it is best to optimize the compensation components value based on measurement.

11.2 Trademarks

All other trademarks are the property of their respective owners.

11.3 Electrostatic Discharge Caution

esds-image

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

11.4 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.