SNVSB92 December   2018 TPS54340B

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: Buck Converter
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedures
        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 Setpoint
        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
      3. 8.2.3 Application Curves
    3. 8.3 Other Applications
      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 Example
      1. 10.2.1 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

TPS54340B G001_SLVSBB4.png
Figure 1. On-Resistance vs Junction Temperature
TPS54340B G003_SLVSBB4.png
Figure 3. Switch Current Limit vs Junction Temperature
TPS54340B G002_SLVSBB4.png
Figure 2. Voltage Reference vs Junction Temperature
TPS54340B G004_slvsBK0.gif
1.
Figure 4. Switch Current Limit vs Input Voltage
TPS54340B G005_SLVSBB4.png
Figure 5. Switching Frequency vs Junction Temperature
TPS54340B G007_SLVSBB4.png
Figure 7. Switching Frequency vs RT/CLK Resistance
High Frequency Range
TPS54340B G009-new.gif
Figure 9. EA Transconductance During Soft Start vs Junction Temperature
TPS54340B G011_SLVSBB4.gif
Figure 11. EN pin Current vs Junction Temperature
TPS54340B G0112a_SLVSBB4.png
Figure 13. EN Pin Current Hysteresis vs Junction Temperature
TPS54340B G014_SLVSBB4.png
Figure 15. Shutdown Supply Current vs Junction Temperature
TPS54340B G016-new.gif
Figure 17. VIN Supply Current vs Junction Temperature
TPS54340B G018-new.gif
Figure 19. BOOT-SW UVLO vs Junction Temperature
TPS54340B G021-new.gif
Figure 21. Soft-Start Time vs Switching Frequency
TPS54340B G006_SLVSBB4.png
Figure 6. Switching Frequency vs RT/CLK Resistance
Low Frequency Range
TPS54340B G008-new.gif
Figure 8. EA Transconductance vs Junction Temperature
TPS54340B G010_SLVSBB4.png
Figure 10. EN Pin Voltage vs Junction Temperature
TPS54340B G012_SLVSBB4.gif
Figure 12. EN pin Current vs Junction Temperature
TPS54340B G013_SLVSBB4.png
Figure 14. Switching Frequency vs FB
TPS54340B G016_slvsBK0.gif
1.
Figure 16. Shutdown Supply Current vs Input Voltage (VIN)

TPS54340B G018_slvsBK0.gif
1.
Figure 18. VIN Supply Current vs Input Voltage
TPS54340B G019_SLVSBB4.png
Figure 20. Input Voltage UVLO vs Junction Temperature