SLVSCQ2 July   2015 TPS65400-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 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 System Characteristics
    7. 7.7 Operational Parameters
    8. 7.8 Package Dissipation Ratings
    9. 7.9 Typical Characteristics: System Efficiency
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1  Startup Timing and Power Sequencing
        1. 8.3.1.1 Startup Timing
        2. 8.3.1.2 External Sequencing
        3. 8.3.1.3 Internal Sequencing
      2. 8.3.2  UVLO and Precision Enables
      3. 8.3.3  Soft-Start and Prebiased Startup
        1. 8.3.3.1 Analog Soft-Start (Default) and Digital Soft-Start
        2. 8.3.3.2 Soft-Start Capacitor Selection
      4. 8.3.4  PWM Switching Frequency Selection
      5. 8.3.5  Clock Synchronization
      6. 8.3.6  Phase Interleaving
      7. 8.3.7  Fault Handling
      8. 8.3.8  OCP for SW1 to SW4
      9. 8.3.9  Overcurrent Protection for SW1 to SW4 in Current Sharing Operation
      10. 8.3.10 Recovery on Power Loss
      11. 8.3.11 Feedback Compensation
      12. 8.3.12 Adjusting Output Voltage
      13. 8.3.13 Digital Interface - PMBus
      14. 8.3.14 Initial Configuration
    4. 8.4 Device Functional Modes
      1. 8.4.1 CCM Operation Mode
      2. 8.4.2 CCM/DCM Operation Mode
      3. 8.4.3 Current Sharing Mode
    5. 8.5 Register Maps
      1. 8.5.1 PMBus
        1. 8.5.1.1 Overview
        2. 8.5.1.2 PMBus Protocol
          1. 8.5.1.2.1  PMBus Protocol
          2. 8.5.1.2.2  Transactions (No PEC)
          3. 8.5.1.2.3  Addressing
          4. 8.5.1.2.4  Startup
          5. 8.5.1.2.5  Bus Speed
          6. 8.5.1.2.6  I2CALERT Terminal
          7. 8.5.1.2.7  CONTROL Terminal
          8. 8.5.1.2.8  Packet Error Checking
          9. 8.5.1.2.9  Group Commands
          10. 8.5.1.2.10 Unsupported Features
      2. 8.5.2 PMBus Register Descriptions
        1. 8.5.2.1 Overview
        2. 8.5.2.2 Memory Model
        3. 8.5.2.3 Data Formats
        4. 8.5.2.4 Fault Monitoring
      3. 8.5.3 PMBus Core Commands
        1. 8.5.3.1  (00h) PAGE
        2. 8.5.3.2  (01h) OPERATION
        3. 8.5.3.3  (03h) CLEAR_FAULTS
        4. 8.5.3.4  (10h) WRITE_PROTECT
        5. 8.5.3.5  (11h) STORE_DEFAULT_ALL
        6. 8.5.3.6  (19h) CAPABILITY
        7. 8.5.3.7  (78h) STATUS_BYTE
        8. 8.5.3.8  (79h) STATUS_WORD
        9. 8.5.3.9  (7Ah) STATUS_VOUT
        10. 8.5.3.10 (80h) STATUS_MFR_SPECIFIC
        11. 8.5.3.11 (98h) PMBUS_REVISION
        12. 8.5.3.12 (ADh) IC_DEVICE_ID
        13. 8.5.3.13 (AEh) IC_DEVICE_REV
      4. 8.5.4 Manufacturer-Specific Commands
        1. 8.5.4.1  (D0h) USER_DATA_BYTE_00
        2. 8.5.4.2  (D1h) USER_DATA_BYTE_01
        3. 8.5.4.3  (D2h) PIN_CONFIG_00
        4. 8.5.4.4  (D3h) PIN_CONFIG_01
        5. 8.5.4.5  (D4h) SEQUENCE_CONFIG
        6. 8.5.4.6  (D5h) SEQUENCE_ORDER
        7. 8.5.4.7  (D6h) IOUT_MODE
        8. 8.5.4.8  (D7h) FREQUENCY_PHASE
        9. 8.5.4.9  (D8h) VREF_COMMAND
        10. 8.5.4.10 (D9h) IOUT_MAX
        11. 8.5.4.11 (DAh) USER_RAM_00
        12. 8.5.4.12 (DBh) SOFT_RESET
        13. 8.5.4.13 (DCh) RESET_DELAY
        14. 8.5.4.14 (DDh) TON_TOFF_DELAY
        15. 8.5.4.15 (DEh) TON_TRANSITION_RATE
        16. 8.5.4.16 (DFh) VREF_TRANSITION_RATE
        17. 8.5.4.17 (F0h) SLOPE_COMPENSATION
        18. 8.5.4.18 (F1h) ISENSE_GAIN
        19. 8.5.4.19 (FCh) DEVICE_CODE
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Internal Operation Typical Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Component Selection
            1. 9.2.1.2.1.1 Output Inductor Selection
            2. 9.2.1.2.1.2 Output Capacitor Selection
          2. 9.2.1.2.2 Internal Operation With Some Switchers Disabled
          3. 9.2.1.2.3 Internal Operation With All Switchers Enabled
          4. 9.2.1.2.4 Example Configuration
          5. 9.2.1.2.5 Unused Switchers
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Current Sharing Typical Application
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Current Sharing Timing Example
      3. 9.2.3 External Sequencing Application
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 External Sequencing Through PG Pins
          2. 9.2.3.2.2 External Sequencing Through SW
          3. 9.2.3.2.3 Example Configuration
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
      2. 12.1.2 Related Parts
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

5 Description (continued)

TPS65400-Q1 implements a PMBus-I2C-compatible digital interface. It helps Core Chip optimize system performance by runtime changing regulated voltage, power sequence, phase interleaving, operating frequency, read back operating status, and so forth.

The TPS65400-Q1 consists of four high-current buck switching regulators (SW1, SW2, SW3, and SW4) with integrated FETs. The switching power supplies are intended for powering high-current digital circuits such as the processor, FPGA, ASIC, memory, and digital I/Os. SW1 and SW2 support 4 A each, and SW3 and SW4 support 2 A each. Each regulator’s switching frequency is independently adjustable up to 2.2 MHz.

Current limit programmability on each switcher enables optimization of inductor ratings for a particular application configuration not requiring the maximum current capability.

The TPS65400-Q1 can be powered from a single-input voltage rail between 4.5 and 18 V, making it suitable for applications running off a 5- or 12-V intermediate power distribution bus.

Sequencing requirements can be met using the individual enable terminals or by programming the sequence through the I2C bus into the onboard EEPROM. Output voltages can be set through external resistor networks and VREF can be programmed from 0.6 to 1.87 V in 10-mV steps. All control and status info can be accessed through a PMBus-compatible I2C bus.

The TPS65400-Q1 provides a high level of flexibility for monitoring and control through the I2C bus while providing the option of programmability through the use of external components and voltage levels for systems not using I2C.