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

9 Power Supply Recommendations

This device is designed to operate from an input voltage supply between 4.5 V and 20 V. There is also an input voltage limitation from power stage. For power stage CSD95378B, the recommended input voltage is up to 14.5 V. The proper bypassing of input supplies is critical for noise performance. See the power stage datasheet for layout information of input capacitors.