SLVS939B June   2009  – December 2014 TPS55332-Q1

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 ESD 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  Input Voltage (VIN)
      2. 7.3.2  Output Voltage (Vout)
      3. 7.3.3  Regulated Supply Voltage (VReg)
      4. 7.3.4  Over-Current Protection (SW)
      5. 7.3.5  Oscillator Frequency (RT)
      6. 7.3.6  Enable / Shutdown (EN)
      7. 7.3.7  Reset Delay (Cdly)
      8. 7.3.8  Reset Pin (RST)
      9. 7.3.9  Boost Capacitor (BOOT)
      10. 7.3.10 Soft Start (SS)
      11. 7.3.11 Synchronization (SYNC)
      12. 7.3.12 Regulation Voltage (VSENSE)
      13. 7.3.13 Reset Threshold (RST_TH)
      14. 7.3.14 Slew Rate Control (Rslew)
      15. 7.3.15 Thermal Shutdown
      16. 7.3.16 Loop Control Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 DCM Operation
      2. 7.4.2 CCM Operation
      3. 7.4.3 Loop Compensation For Stability Criteria
  8. 8 Application 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  Output Capacitor (Co)
        2. 8.2.2.2  Output Inductor Selection (Lo) for CCM
        3. 8.2.2.3  Output Diode
        4. 8.2.2.4  Input Capacitor CI
        5. 8.2.2.5  Output Voltage And Feedback Resistor Selection
        6. 8.2.2.6  Reset Threshold Resistor Selection
        7. 8.2.2.7  Soft Start Capacitor
        8. 8.2.2.8  Loop Compensation Calculation
        9. 8.2.2.9  Loop Compensation Response
        10. 8.2.2.10 Output Inductor Selection (LO) For DCM
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Inductor
      2. 10.1.2 Input Filter Capacitors
      3. 10.1.3 Feedback
      4. 10.1.4 Traces And Ground Plane
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

The TPS55332-Q1 device is designed to operate from an input voltage up to 40 V. Ensure that the input supply is well regulated. Furthermore, if the supply voltage in the application is likely to reach negative voltage (for example, reverse battery) a forward diode must be placed at the input of the supply. For the VIN pin, a small ceramic capacitor with a typical value of 0.1μF is recommended. Capacitance de-rating for aging, temperature, and DC bias must be taken into account while determining the capacitor value. Connect a local decoupling capacitor close to the BOOT pin for proper gate drive voltage for the internal MOSFET switch.