SLVSCA6C October   2013  – October 2017 TPS65311-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 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
      1. 7.8.1 BUCK 1 Characteristics
      2. 7.8.2 BUCK 2 and BUCK3 Characteristics
      3. 7.8.3 BOOST Characteristics
      4. 7.8.4 LDO Noise Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Buck Controller (BUCK1)
      2. 8.3.2  Synchronous Buck Converters BUCK2 and BUCK3
      3. 8.3.3  BOOST Converter
      4. 8.3.4  Frequency-Hopping Spread Spectrum
      5. 8.3.5  Linear Regulator LDO
      6. 8.3.6  Gate Driver Supply
      7. 8.3.7  RESET
      8. 8.3.8  Soft Start
      9. 8.3.9  Power-on Reset Flag
      10. 8.3.10 WAKE Pin
      11. 8.3.11 IRQ Pin
      12. 8.3.12 VBAT Undervoltage Warning
      13. 8.3.13 VIN Over or Undervoltage Protection
      14. 8.3.14 External Protection
      15. 8.3.15 Overtemperature Detection and Shutdown
      16. 8.3.16 Independent Voltage Monitoring
      17. 8.3.17 GND Loss Detection
      18. 8.3.18 Reference Voltage
      19. 8.3.19 Shutdown Comparator
      20. 8.3.20 LED and High-Side Switch Control
      21. 8.3.21 Window Watchdog
      22. 8.3.22 Timeout in Start-Up Modes
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operating Modes
        1. 8.4.1.1  INIT
        2. 8.4.1.2  TESTSTART
        3. 8.4.1.3  TESTSTOP
        4. 8.4.1.4  VTCHECK
        5. 8.4.1.5  RAMP
          1. 8.4.1.5.1 Power-Up Sequencing
          2. 8.4.1.5.2 Power-Down Sequencing
        6. 8.4.1.6  ACTIVE
        7. 8.4.1.7  ERROR
        8. 8.4.1.8  LOCKED
        9. 8.4.1.9  LPM0
        10. 8.4.1.10 SHUTDOWN
    5. 8.5 Programming
      1. 8.5.1 SPI
        1. 8.5.1.1 FSI Bit
    6. 8.6 Register Map
      1. 8.6.1 Register Description
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Buck Controller (BUCK1)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Adjusting the Output Voltage for the BUCK1 Controller
          2. 9.2.1.2.2 Output Inductor, Sense Resistor, and Capacitor Selection for the BUCK1 Controller
          3. 9.2.1.2.3 Compensation of the Buck Controller
          4. 9.2.1.2.4 Bootstrap Capacitor for the BUCK1 Controller
        3. 9.2.1.3 BUCK 1 Application Curve
      2. 9.2.2 Synchronous Buck Converters BUCK2 and BUCK3
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Adjusting the Output Voltage for the BUCK2 and BUCK3 Converter
          2. 9.2.2.2.2 Output Inductor Selection for the BUCK2 and BUCK3 Converter
          3. 9.2.2.2.3 Compensation of the BUCK2 and BUCK3 Converters
          4. 9.2.2.2.4 Bootstrap Capacitor for the BUCK2/3 Converters
        3. 9.2.2.3 BUCK2 and BUCK3 Application Curves
      3. 9.2.3 BOOST Converter
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 Adjusting the Output Voltage for the Boost Converter
          2. 9.2.3.2.2 Output Inductor and Capacitor Selection for the BOOST Converter
          3. 9.2.3.2.3 Compensation of the BOOST Converter
          4. 9.2.3.2.4 Output Diode for the BOOST Converter
        3. 9.2.3.3 BOOST Converter Application Curves
      4. 9.2.4 Linear Regulator
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
          1. 9.2.4.2.1 Adjusting the Output Voltage for the Linear Regulator
          2. 9.2.4.2.2 Output Capacitance for the Linear Regulator
        3. 9.2.4.3 Linear Regulator Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Buck Controller
      2. 11.1.2 Buck Converter
      3. 11.1.3 Boost Converter
      4. 11.1.4 Linear Regulator
      5. 11.1.5 Other Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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10 Power Supply Recommendations

The device is designed to operate from an input voltage supply range between 4 V and 40 V (see Figure 40 for reference). This input supply must be well regulated. In case the supply voltage in the application is likely to exceed 40 V, the external PMOS protection device as explained in External Protection must be applied between VIN and VINPROT pins. Furthermore, if the supply voltage in the application is likely to reach negative voltage (for example, reverse battery), a forward diode must be placed between the VSSENSE and VIN pins. A ceramic bypass capacitor with a value of 100 μF (typical) is recommended to be placed close to the VINPROT pin. For the VIN pin, a small ceramic capacitor of typical 1 µF is recommended. Also place 1-µF (typical) bypass capacitors to the DVDD and VREF pins, and 100-nF (typical) bypass capacitors to VIO pin. Furthermore, the VREG pin requires a bypass capacitor of 2.2 µF (typical).

The BUCK1 output voltage is the recommended input supply for the BUCK2, BUCK3, and BOOST regulators. Place local, 10-µF (typical) bypass capacitors at the VSUP2 and VSUP3 pins and at the supply input of the BOOST in front of the BOOST-inductor. Also place a local, 1-µF (typical) bypass capacitor at the VSUP4 pin.

The EXTSUP pin can be used to improve efficiency. For the EXTSUP pin to improve efficiency, a voltage of more than 4.8 V is required in order to have VREG regulator supplied from EXTSUP pin. If the EXSUP pin is not used, the VINPROT pin supplies the VREG regulator. The EXTSUP pin requires a 100-nF (typical) bypass capacitor.

TPS65311-Q1 typ_app_1_slvsca6.gif Figure 40. Typical Application Schematic