SLVS889C October   2008  – November 2014 TPS54140

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency PWM Control
      2. 8.3.2  Slope Compensation Output Current
      3. 8.3.3  Bootstrap Voltage (BOOT)
      4. 8.3.4  Low Dropout Operation
      5. 8.3.5  Error Amplifier
      6. 8.3.6  Voltage Reference
      7. 8.3.7  Adjusting the Output Voltage
      8. 8.3.8  Enable and Adjusting Undervoltage Lockout
      9. 8.3.9  Slow Start and Tracking Pin (SS/TR)
      10. 8.3.10 Overload-Recovery Circuit
      11. 8.3.11 Sequencing
      12. 8.3.12 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      13. 8.3.13 Overcurrent Protection and Frequency Shift
      14. 8.3.14 Selecting the Switching Frequency
      15. 8.3.15 How to Interface to RT/CLK Pin
      16. 8.3.16 Power Good (PWRGD Pin)
      17. 8.3.17 Overvoltage Transient Protection
      18. 8.3.18 Thermal Shutdown
      19. 8.3.19 Small-Signal Model for Loop Response
      20. 8.3.20 Simple Small-Signal Model for Peak-Current Mode Control
      21. 8.3.21 Small-Signal Model for Frequency Compensation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pulse Skip Eco-mode
      2. 8.4.2 Operation With VIN < 3.5 V
      3. 8.4.3 Operation With EN Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Selecting the Switching Frequency
        2. 9.2.2.2  Output Inductor Selection (LO)
        3. 9.2.2.3  Output Capacitor
        4. 9.2.2.4  Catch Diode
        5. 9.2.2.5  Input Capacitor
        6. 9.2.2.6  Slow-Start Capacitor
        7. 9.2.2.7  Bootstrap Capacitor Selection
        8. 9.2.2.8  Undervoltage-Lockout Set Point
        9. 9.2.2.9  Output Voltage and Feedback Resistors Selection
        10. 9.2.2.10 Compensation
        11. 9.2.2.11 Power Dissipation Estimate
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

5 Revision History

Changes from B Revision (September 2013) to C Revision

  • Added the Handling Ratings table and the following sections:Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Device and Documentation Support, and Mechanical, Packaging, and Orderable InformationGo

Changes from A Revision (August 2012) to B Revision

  • Deleted SWIFT from the data sheet Title and FeaturesGo

Changes from * Revision (October 2008) to A Revision

  • Changed Features Item From: 300kHz to 2.5MHz Switching Frequency To: 100kHz to 2.5MHz Switching FrequencyGo
  • Changed Description text From: "within 93% to 107% of its nom voltage." To: "within 94% to 107% of its nom voltage."Go
  • Changed Enable threshold +50 mV TYP value From: ±3.8 To: –3.8Go
  • Changed Enable threshold ±50 mV TYP value From: ±0.9 To: –0.98Go
  • Changed Hysteresis current TYP value From: ±2.9 To: –2.9Go
  • Changed Error amplifier transconductance (gM) Test Condition From: ±2 μA < ICOMP < 2 μA, VCOMP = 1 V To: –2 μA < ICOMP < 2 μA, VCOMP = 1 VGo
  • Changed Error amplifier transconductance (gM) during slow start From: ±2 μA < ICOMP < 2 μA, VCOMP = 1 V To: –2 μA < ICOMP < 2 μA, VCOMP = 1 VGo
  • Changed text in the Error Amplifier section From: "the gm is 25 μA/V" To: "the gm is 26 μA/V" Go
  • Changed text in the Slow Start and Tracking Pin (SS/TR) section From: "VIN UVLO is exceeded, 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 29Go
  • Changed 7.25V to 7.7V and 6.25V to 6.7V in the Under Voltage Lock Out Set Point section.Go
  • Changed Equation 47Go
  • Changed Equation 49Go