SLVS975C September   2009  – April 2018 TPS54318

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Efficiency vs Output 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 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 and Output Current
      3. 7.3.3  Bootstrap Voltage (Boot) and Low Dropout Operation
      4. 7.3.4  Error Amplifier
      5. 7.3.5  Voltage Reference
      6. 7.3.6  Adjusting the Output Voltage
      7. 7.3.7  Enable and Adjusting Undervoltage Lockout
      8. 7.3.8  Soft-Start Pin
      9. 7.3.9  Sequencing
      10. 7.3.10 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      11. 7.3.11 Overcurrent Protection
      12. 7.3.12 Frequency Shift
      13. 7.3.13 Reverse Overcurrent Protection
      14. 7.3.14 Synchronize Using the RT/CLK Pin
      15. 7.3.15 Power Good (PWRGD Pin)
      16. 7.3.16 Overvoltage Transient Protection
      17. 7.3.17 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Small Signal Model for Loop Response
      2. 7.4.2 Simple Small Signal Model for Peak Current Mode Control
      3. 7.4.3 Small Signal Model for Frequency Compensation
  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  Step One: Select the Switching Frequency
        2. 8.2.2.2  Step Two: Select the Output Inductor
        3. 8.2.2.3  Step Three: Choose the Output Capacitor
        4. 8.2.2.4  Step Four: Select the Input Capacitor
        5. 8.2.2.5  Step Five: Minimum Load DC COMP Voltage
        6. 8.2.2.6  Step Six: Choose the Soft-Start Capacitor
        7. 8.2.2.7  Step Seven: Select the Bootstrap Capacitor
        8. 8.2.2.8  Step Eight: Undervoltage Lockout Threshold
        9. 8.2.2.9  Step Nine: Select Output Voltage and Feedback Resistors
          1. 8.2.2.9.1 Output Voltage Limitations
        10. 8.2.2.10 Step 10: Select Loop Compensation Components
        11. 8.2.2.11 Power Dissipation Estimate
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Custom Design With WEBENCH® Tools
      2. 11.1.2 Development Support
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.6 Typical Characteristics

TPS54318 hilo_rdson_lvs946.gifFigure 1. High-Side and Low-Side On Resistance vs Junction Temperature
TPS54318 Curr_v_Tj_lvs975.gifFigure 3. High-Side Current Limit vs Junction Temperature
TPS54318 fs_rt_lvs975.gifFigure 5. Switching Frequency vs RT Resistance Low Frequency Range
TPS54318 fs_vsense.gifFigure 7. Switching Frequency vs Vsense
TPS54318 ea2_tj_lvs946.gifFigure 9. Transconductance (Soft-Start) vs Junction Temperature
TPS54318 pin_cur_tj_lvs975.gifFigure 11. Pin Current vs Junction Temperature
TPS54318 ss_tj_lvs946.gifFigure 13. Charge Current vs Junction Temperature
TPS54318 vin_tj_lvs946.gifFigure 15. Input Voltage vs Junction Temperature
TPS54318 shutdwn_vi_lvs946.gifFigure 17. Shutdown Supply Current vs Input Voltage
TPS54318 icc_vi_lvs946.gifFigure 19. Supply Current vs Input Voltage
TPS54318 radson_tj_lvs946.gifFigure 21. PWRGD On Resistance vs Junction Temperature
TPS54318 freq_temp_lvs946.gifFigure 2. Frequency vs Junction Temperature
TPS54318 vref_tj_lvs946.gifFigure 4. Voltage Reference vs Junction Temperature
TPS54318 fs2_rt_lvs975.gifFigure 6. Switching Frequency vs RT Resistance High Frequency Range
TPS54318 ea_tj_lvs946.gifFigure 8. Transconductance vs Junction Temperature
TPS54318 en_tj_lvs946.gifFigure 10. Enable Pin Voltage vs Junction Temperature
TPS54318 pin2_cur_tj_lvs975.gifFigure 12. Pin Current vs Junction Temperature
TPS54318 ss2_tj_lvs946.gifFigure 14. Discharge Current vs Junction Temperature
TPS54318 shutdwn_tj_lvs946.gifFigure 16. Shutdown Supply Current vs Junction Temperature
TPS54318 icc_tj_lvs946.gifFigure 18. Supply Current vs Junction Temperature
TPS54318 pwrgd_tj_lvs946.gifFigure 20. PWRGD Threshold vs Junction Temperature
TPS54318 wave.gifFigure 22. Minimum Comp Voltage Clamp vs Junction Temperature