SLUSG37 March   2025 TPS543321 , TPS543421 , TPS543521

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Fixed Frequency Peak Current Mode
      2. 6.3.2  Mode Selection
      3. 6.3.3  Voltage Reference
      4. 6.3.4  Output Voltage Setting
      5. 6.3.5  Switching Frequency Selection / Synchronization
      6. 6.3.6  Phase Shift
      7. 6.3.7  Enable and Adjusting Undervoltage Lockout
      8. 6.3.8  External Soft Start and Prebiased Soft Start
      9. 6.3.9  Power Good
      10. 6.3.10 Minimum On Time, Minimum Off Time, and Frequency Foldback
      11. 6.3.11 Frequency Spread Spectrum
      12. 6.3.12 Overvoltage Protection
      13. 6.3.13 Overcurrent and Undervoltage Protection
      14. 6.3.14 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Modes Overview
      2. 6.4.2 Heavy Load Operation
      3. 6.4.3 Pulse Frequency Modulation
      4. 6.4.4 Forced Continuous Conduction Modulation
      5. 6.4.5 Dropout Operation
      6. 6.4.6 Minimum On-Time Operation
      7. 6.4.7 Shutdown Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 Output Voltage Resistors Selection
        3. 7.2.2.3 Choosing Switching Frequency
        4. 7.2.2.4 Soft-Start Capacitor Selection
        5. 7.2.2.5 Output Inductor Selection
        6. 7.2.2.6 Output Capacitor Selection
        7. 7.2.2.7 Input Capacitor Selection
        8. 7.2.2.8 Feedforward Capacitor CFF Selection
        9. 7.2.2.9 Maximum Ambient Temperature
      3. 7.2.3 Application Curves
    3. 7.3 Best Design Practices
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Development Support
        1. 8.1.2.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.3 Application Curves

VIN = 12V, VOUT = 5V, L1= 5.6µH, COUT = 44µF, TA = 25°C (unless otherwise noted)

TPS543321 TPS543421 TPS543521 Efficiency (FCCM)Figure 7-2 Efficiency (FCCM)
TPS543321 TPS543421 TPS543521 Switching Frequency vs Load CurrentFigure 7-4 Switching Frequency vs Load Current
TPS543321 TPS543421 TPS543521 Start-Up Relative to VIN, IOUT = 5AFigure 7-6 Start-Up Relative to VIN, IOUT = 5A
TPS543321 TPS543421 TPS543521 Steady State, IOUT = 0AFigure 7-8 Steady State, IOUT = 0A
TPS543321 TPS543421 TPS543521 Load Transient Response, 0.5 to 4.5A, Slew Rate = 0.8A/μSFigure 7-10 Load Transient Response, 0.5 to 4.5A, Slew Rate = 0.8A/μS
TPS543321 TPS543421 TPS543521 VOUT Hard Short RecoveryFigure 7-12 VOUT Hard Short Recovery
TPS543321 TPS543421 TPS543521 Load Regulation Figure 7-3 Load Regulation
TPS543321 TPS543421 TPS543521 Case Temperature, VIN = 12V, IOUT = 5A, fSW = 500kHzFigure 7-5 Case Temperature, VIN = 12V, IOUT = 5A, fSW = 500kHz
TPS543321 TPS543421 TPS543521 Start-Up Through EN, IOUT = 5AFigure 7-7 Start-Up Through EN, IOUT = 5A
TPS543321 TPS543421 TPS543521 Steady State, IOUT = 5AFigure 7-9 Steady State, IOUT = 5A
TPS543321 TPS543421 TPS543521 VOUT Hard Short ProtectionFigure 7-11 VOUT Hard Short Protection