SLVSEZ9 January   2019 TPS54540B

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Efficiency vs Load Current
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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) pin)
      10. 7.3.10 Accurate Current-Limit Operation and Maximum Switching Frequency
      11. 7.3.11 Synchronization to RT/CLK pin
      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
  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
        14. 8.2.2.14 Safe Operating Area
      3. 8.2.3 Application Curves
    3. 8.3 Other System Examples
      1. 8.3.1 Inverting Power
      2. 8.3.2 Split-Rail Power Supply
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Estimated Circuit Area
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 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
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.7 Typical Characteristics

TPS54540B C025_SLVSBN0.png
VIN = 12 V
Figure 1. On Resistance vs Junction Temperature
TPS54540B C027_SLVSEZ9.gif
VIN = 4.5 and 12 V
Figure 3. Switch Current Limit vs Junction Temperature
TPS54540B C026_SLVSBN0.png
VIN = 12 V
Figure 2. Voltage Reference vs Junction Temperature
TPS54540B C028_SLVSEZ9.gif
Figure 4. Switch Current Limit vs Input Voltage
TPS54540B C029_SLVSBN0.png
VIN = 12 V RT = 200 kΩ
Figure 5. Switching Frequency vs Junction Temperature
TPS54540B C031_SLVSBN0.png
VIN = 12 V
Figure 7. Switching Frequency vs RT/CLK Resistance
High Frequency Range
TPS54540B C033_SLVSBN0.png
VIN = 12 V
Figure 9. EA Transconductance During Soft Start vs Junction Temperature
TPS54540B C035_SLVSBN0.png
VIN = 12 V IEN = Threshold +50 mV
Figure 11. EN Pin Current vs Junction Temperature
TPS54540B C037_SLVSBN0.png
VIN = 12 V
Figure 13. EN Pin Current Hysteresis vs Junction Temperature
TPS54540B C039_SLVSBN0.png
VIN = 12 V
Figure 15. Shutdown Supply Current vs Junction Temperature
TPS54540B C041_SLVSBN0.png
VIN = 12 V
Figure 17. VIN Supply Current vs Junction Temperature
TPS54540B C043_SLVSBN0.pngFigure 19. BOOT-SW UVLO vs Junction Temperature
TPS54540B C045_SLVSBN0.png
VIN = 12 V TJ = 25°C
Figure 21. Soft-Start Time vs Switching Frequency
TPS54540B C030_SLVSBN0.png
ƒsw (kHz) = 92471 x RT (kΩ)-0.991
RT (kΩ) = 101756 x ƒsw (kHz)-1.008
Figure 6. Switching Frequency vs RT/CLK Resistance
Low Frequency Range
TPS54540B C032_SLVSBN0.png
Figure 8. EA Transconductance vs Junction Temperature
TPS54540B C034_SLVSBN0.png
VIN = 12 V
Figure 10. EN Pin Voltage vs Junction Temperature
TPS54540B C036_SLVSBN0.png
VIN = 12 V IEN = Threshold –50 mV
Figure 12. EN Pin Current vs Junction Temperature
TPS54540B C038_SLVSBN0.png
Figure 14. Switching Frequency vs VSENSE
TPS54540B G016_slvsBK0.gif
TA = 25°C
Figure 16. Shutdown Supply Current vs Input Voltage (VIN)
TPS54540B C042_SLVSBX7.png
TJ = 25°C
Figure 18. VIN Supply Current vs Input Voltage
TPS54540B C044_SLVSBN0.pngFigure 20. Input Voltage UVLO vs Junction Temperature