SLUS739F September   2006  – January 2016 TPS40200-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 MOSFET Gate Drive
      2. 7.3.2 Undervoltage Lockout Protection
      3. 7.3.3 Selecting the Operating Frequency
      4. 7.3.4 Synchronizing the Oscillator
      5. 7.3.5 Current-Limit Resistor Selection
      6. 7.3.6 Calculating the Soft-Start Time
      7. 7.3.7 Voltage Setting and Modulator Gain
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation Near Minimum Input Voltage
      2. 7.4.2 Operation With SS Pin
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Buck Regulator, 8-V to 12-V Input, 3.3-V or 5-V Output at 2.5 A
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 FET Selection Criteria
          2. 8.2.1.2.2 Rectifier Selection Criteria
          3. 8.2.1.2.3 Inductor Selection Criteria
          4. 8.2.1.2.4 Output Capacitance
          5. 8.2.1.2.5 Switching Frequency
          6. 8.2.1.2.6 Calculating the Overcurrent Threshold Level
          7. 8.2.1.2.7 Soft-Start Capacitor
          8. 8.2.1.2.8 Frequency Compensation
            1. 8.2.1.2.8.1 Step 1
            2. 8.2.1.2.8.2 Step 2
            3. 8.2.1.2.8.3 Step 3
            4. 8.2.1.2.8.4 Step 4
            5. 8.2.1.2.8.5 Step 5
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Application 2: 18-V to 50-V Input, 16-V Output at 1 A
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Application 3: Wide-Input-Voltage LED Constant-Current Driver
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curve
  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 Device Support
      1. 11.1.1 Related Products
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    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 TPS40200-Q1 is designed to operate from an input voltage supply range between 4.5 V and 52 V. This input supply should be well regulated. If the input supply is located more than a few inches from the buck power stage controlled by the TPS40200-Q1, 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.