SLVSBX7B May   2013  – March 2017 TPS54540

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 Timing Requirements
    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  Fixed Frequency PWM Control
      2. 7.3.2  Slope Compensation Output Current
      3. 7.3.3  Pulse Skip Eco-mode
      4. 7.3.4  Low Dropout Operation and Bootstrap Voltage (BOOT)
      5. 7.3.5  Error Amplifier
      6. 7.3.6  Adjusting the Output Voltage
      7. 7.3.7  Enable and Adjusting Undervoltage Lockout
      8. 7.3.8  Internal Soft-Start
      9. 7.3.9  Constant Switching Frequency and Timing Resistor (RT/CLK) Terminal)
      10. 7.3.10 Accurate Current Limit Operation and Maximum Switching Frequency
      11. 7.3.11 Synchronization to RT/CLK Terminal
      12. 7.3.12 Overvoltage Protection
      13. 7.3.13 Thermal Shutdown
      14. 7.3.14 Small Signal Model for Loop Response
      15. 7.3.15 Simple Small Signal Model for Peak Current Mode Control
      16. 7.3.16 Small Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation with VIN = < 4.5 V (Minimum VIN)
      2. 7.4.2 Operation with EN Control
      3. 7.4.3 Alternate Power Supply Topologies
        1. 7.4.3.1 Inverting Power
        2. 7.4.3.2 Split Rail Power Supply
  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  Custom Design with WEBENCH® Tools
        2. 8.2.2.2  Selecting the Switching Frequency
        3. 8.2.2.3  Output Inductor Selection (LO)
        4. 8.2.2.4  Output Capacitor
        5. 8.2.2.5  Catch Diode
        6. 8.2.2.6  Input Capacitor
        7. 8.2.2.7  Bootstrap Capacitor Selection
        8. 8.2.2.8  Undervoltage Lockout Set Point
        9. 8.2.2.9  Output Voltage and Feedback Resistors Selection
        10. 8.2.2.10 Minimum VIN
        11. 8.2.2.11 Compensation
        12. 8.2.2.12 Discontinuous Conduction Mode and Eco-mode Boundary
        13. 8.2.2.13 Power Dissipation Estimate
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Safe Operating Area
    2. 10.2 Layout Guidelines
    3. 10.3 Layout Example
      1. 10.3.1 Estimated Circuit Area
  11. 11Device and Documentation Support
    1. 11.1 Custom Design with WEBENCH® Tools
    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

4 Revision History

Changes from A Revision (March 2014) to B Revision

  • Added the WEBENCH information in the Features, Detailed Design Procedure, and Device Support sectionsGo
  • Changed the Handling Ratings table To ESD Ratings tableGo
  • Changed VIN MIN Value From: 4.5 V To: VO + VDO, and added Note 1 in the Recommended Operating ConditionsGo
  • Deleted last graph: "5 V Start and Stop Voltage" from the Typical CharacteristicsGo
  • Updated text and added Equation 1 in the Low Dropout Operation and Bootstrap Voltage (BOOT) Go
  • Deleted text: "The start and stop voltage for a typical 5 V..." from the Low Dropout Operation and Bootstrap Voltage (BOOT) sectionGo
  • Changed Equation 7 and Equation 8. Go
  • Changed Equation 27 Go
  • Added new section: Minimum VINGo
  • Deleted 2 graphs named "Low Dropout Operation" from the Application Curves section Go

Changes from * Revision (May 2013) to A Revision

  • Added Device Information table, Recommended Operating Conditions table, Pin Configuration and Functions section, Handling 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
  • Changed the Electrical Characteristics Conditions From: VIN = 4.5 to 60 V To: VIN = 4.5 to 42 VGo
  • Changed the Operating: nonswitching supply current TEST CONDITIONS From: FB = 0.83 V To: FB = 0.9 VGo
  • Changed RT/CLK high threshold MAX value From: 1.7 V To: 2 V Go
  • Changed the title of graph "5 V Start and Stop Voltage" to include a link to the Low Dropout Operation section. Go
  • Changed the FBD, removed the Logic block and Shutdown signal from the OV comparatorGo
  • Changed VF = Forward Drop of the Catch Diode To: VD = Forward Drop of the Catch Diode Go
  • Deleted value TSW = 1 / Fsw from the list following Equation 2Go
  • Changed VB2SW = VBOOT + VF To: VB2SW = VBOOT + VDGo
  • Changed VBOOT = (1.41 x VIN - 0.554 - VF / TSW - 1.847 x 103 x IB2SW) / (1.41 + 1 / Tsw) To: VBOOT = (1.41 x VIN - 0.554 - VD x ƒSW - 1.847 x 103 x IB2SW) / (1.41 + ƒSW)Go
  • Deleted figure: "5V Start/Stop Voltage"Go
  • Added a title to Figure 23Go
  • Changed the section title From: Selecting the Switching Frequency To: Accurate Current Limit Operation and Maximum Switching FrequencyGo
  • Changed text in the Synchronization to RT/CLK terminal section From: "0.5 V and higher than 1.7 V" To: "0.5 V and higher than 2 V" Go
  • Changed Equation 33 From: (5.13V2 - 5 V2) To: 3.43 V2 - 3.3 V2)Go
  • Changed Figure 36, VOUT From: 200 mV/div To 100 mV/div Go
  • Changed Figure 38 , EN From: 1 V/div To: 2 V/div, VOUT From: 4 V/div To: 2 V/div, and Time = 2 ms/div To: Time = 20 ms/divGo
  • Changed Figure 39 , VOUT From: 4 V/div To: 2 V/divGo