SLVSB55C May   2012  – October 2015 TPS54140A

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  Fixed Frequency PWM Control
      2. 7.3.2  Slope Compensation Output Current
      3. 7.3.3  Pulse Skip Eco-mode
      4. 7.3.4  Bootstrap Voltage (BOOT)
      5. 7.3.5  Low Dropout Operation
      6. 7.3.6  Error Amplifier
      7. 7.3.7  Voltage Reference
      8. 7.3.8  Overload Recovery Circuit
      9. 7.3.9  Overcurrent Protection and Frequency Shift
      10. 7.3.10 Power Good (PWRGD Pin)
      11. 7.3.11 Overvoltage Transient Protection
      12. 7.3.12 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation with VIN < 3.5 V (Minimum VIN)
      2. 7.4.2 Operation with EN Control
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Adjusting the Output Voltage
      2. 8.1.2 Enable and Adjusting Undervoltage Lockout
      3. 8.1.3 Slow Start/Tracking Pin (SS/TR)
      4. 8.1.4 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      5. 8.1.5 Selecting the Switching Frequency
      6. 8.1.6 How to Interface to RT/CLK Pin
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Selecting the Switching Frequency
        2. 8.2.2.2  Output Inductor Selection (LO)
        3. 8.2.2.3  Output Capacitor
        4. 8.2.2.4  Catch Diode
        5. 8.2.2.5  Input Capacitor
        6. 8.2.2.6  Slow Start Capacitor
        7. 8.2.2.7  Bootstrap Capacitor Selection
        8. 8.2.2.8  Undervoltage Lock Out Set Point
        9. 8.2.2.9  Output Voltage and Feedback Resistors Selection
        10. 8.2.2.10 Compensation
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1 Simple Small Signal Model for Peak Current Mode Control
      2. 8.3.2 Small Signal Model for Frequency Compensation
      3. 8.3.3 Small Signal Model for Loop Response
  9. 9 Power Supply Recommendations
    1. 9.1 Sequencing
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation Estimate
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

4 Revision History

Changes from B Revision (January 2014) to C Revision

  • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section. Go

Changes from A Revision (July 2012) to B Revision

  • Deleted SWIFT from the data sheet Title and Features Go

Changes from * Revision (May 2012) to A Revision

  • Changed Description text From: "within 93% to 107% of its nominal voltage." To: "within 94% to 107% of its nominal voltage."Go
  • Changed the values of the Hysteresis current in the Electrical Characteristics tableGo
  • Changed text in the Slow Start and Tracking Pin (SS/TR) section From: "VIN UVLO is excedded, EN pin pulled below 1.25V" To: "VIN pin is below the VIN UVLO, EN pin pulled below 1.25V"Go
  • Changed Start Input Voltage (rising VIN) voltage From: 7.25 V To: 7.7 VGo
  • Changed Start Input Voltage (falling VIN) voltage From: 6.25 V To: 6.7 VGo
  • Changed Equation 11Go
  • Changed 7.25V to 7.7V and 6.25V to 6.7V in the Under Voltage Lock Out Set Point section.Go
  • Changed Equation 29Go
  • Changed Equation 30 and Equation 31Go
  • Changed Equation 33Go