SLVSD50D March   2016  – June 2017 TPS65320C-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 Switching Characteristics
    7. 6.7 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 Buck Regulator
        1. 7.3.1.1  Fixed-Frequency PWM Control
        2. 7.3.1.2  Slope Compensation Output
        3. 7.3.1.3  Pulse-Skip Eco-mode™ Control Scheme
        4. 7.3.1.4  Dropout Mode Operation and Bootstrap Voltage (BOOT)
        5. 7.3.1.5  Error Amplifier
        6. 7.3.1.6  Voltage Reference
        7. 7.3.1.7  Adjusting the Output Voltage
        8. 7.3.1.8  Soft-Start and Tracking Pin (SS/TR)
        9. 7.3.1.9  Overload-Recovery Circuit
        10. 7.3.1.10 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
        11. 7.3.1.11 Overcurrent Protection and Frequency Shift
        12. 7.3.1.12 Selecting the Switching Frequency
        13. 7.3.1.13 How to Interface to RT/CLK Pin
        14. 7.3.1.14 Overvoltage Transient Protection
        15. 7.3.1.15 Small-Signal Model for Loop Response
        16. 7.3.1.16 Simple Small-Signal Model for Peak-Current Mode Control
        17. 7.3.1.17 Small-Signal Model for Frequency Compensation
      2. 7.3.2 LDO Regulator
        1. 7.3.2.1 Charge-Pump Operation
        2. 7.3.2.2 Low-Voltage Tracking
        3. 7.3.2.3 Adjusting the Output Voltage
      3. 7.3.3 Thermal Shutdown
      4. 7.3.4 Power-Good Output, nRST
      5. 7.3.5 Enable and Undervoltage Lockout
    4. 7.4 Device Functional Modes
      1. 7.4.1 Modes of Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Soft-Start Discharge
      2. 8.1.2 Passive Discharge Through a Resistor in Parallel With the SS Capacitor
      3. 8.1.3 Active Discharge Through A NPN Transistor
    2. 8.2 Typical Application
      1. 8.2.1 2-MHzSwitching Frequency, 9-V to 16-V Input, 5-V Output Buck Regulator, 3.3-V Output LDO Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Switching Frequency Selection for the Buck Regulator
          2. 8.2.1.2.2  Output Inductor Selection for the Buck Regulator
          3. 8.2.1.2.3  Output Capacitor Selection for the Buck Regulator
          4. 8.2.1.2.4  Catch Diode Selection for the Buck Regulator
          5. 8.2.1.2.5  Input Capacitor Selection for the Buck Regulator
          6. 8.2.1.2.6  Soft-Start Capacitor Selection for the Buck Regulator
          7. 8.2.1.2.7  Bootstrap Capacitor Selection for the Buck Regulator
          8. 8.2.1.2.8  Output Voltage and Feedback Resistor Selection for the Buck Regulator
          9. 8.2.1.2.9  Frequency Compensation Selection for the Buck Regulator
          10. 8.2.1.2.10 LDO Regulator
          11. 8.2.1.2.11 Power Dissipation
            1. 8.2.1.2.11.1 Power Dissipation Losses of the Buck Regulator
          12. 8.2.1.2.12 Power Dissipation Losses of the LDO Regulator
          13. 8.2.1.2.13 Total Device Power Dissipation Losses and Junction Temperature
        3. 8.2.1.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 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

The buck regulator is designed to operate from an input voltage supply range between 3.6 V and 36 V. The linear regulator is designed to operate from an input supply voltage up to 20 V. Both input supplies must be well regulated. If the input supply connected to the VIN pin is located more than a few inches from the TPS65320C-Q1 converter additional bulk capacitance may be required in addition to the ceramic bypass capacitors. An electrolytic capacitor with a value of 100 μF is a typical choice.