SLVSBK0D October   2012  – March 2017 TPS54340

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) Terminal)
      10. 7.3.10 Accurate Current Limit Operation and Maximum Switching Frequency
      11. 7.3.11 Synchronization to RT/CLKTerminal
      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 Applications
      1. 8.2.1 Buck Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedures
          1. 8.2.1.2.1  Custom Design with WEBENCH Tools
          2. 8.2.1.2.2  Selecting the Switching Frequency
          3. 8.2.1.2.3  Output Inductor Selection (LO)
          4. 8.2.1.2.4  Output Capacitor
          5. 8.2.1.2.5  Catch Diode
          6. 8.2.1.2.6  Input Capacitor
          7. 8.2.1.2.7  Bootstrap Capacitor Selection
          8. 8.2.1.2.8  Undervoltage Lockout Set Point
          9. 8.2.1.2.9  Output Voltage and Feedback Resistors Selection
          10. 8.2.1.2.10 Minimum VIN
          11. 8.2.1.2.11 Compensation
          12. 8.2.1.2.12 Discontinuous Conduction Mode and Eco-mode Boundary
          13. 8.2.1.2.13 Power Dissipation
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Inverting Power
      3. 8.2.3 Split Rail Power Supply
    3. 8.3 WEBENCH Power Designer
  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 Custom Design with WEBENCH Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Receiving Notification of Documentation Updates
      2. 11.2.2 Related Documentation
    3. 11.3 Trademarks
    4. 11.4 Community Resources
    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

6.7 Typical Characteristics

TPS54340 G001_SLVSBB4.png
VIN = 12V
Figure 1. On Resistance vs Junction Temperature
TPS54340 G003_SLVSBK0.png
VIN = 12 V
Figure 3. Switch Current Limit vs Junction Temperature
TPS54340 C026_SLVSBN0.png
VIN = 12 V
Figure 2. Voltage Reference vs Junction Temperature
TPS54340 G004_slvsBK0.gif
VIN = 12V
Figure 4. Switch Current Limit vs Input Voltage
TPS54340 C029_SLVSBN0.png
VIN = 12 V RT = 200 kΩ
Figure 5. Switching Frequency vs Junction Temperature
TPS54340 G007_SLVSBB4.png
VIN = 12V
Figure 7. Switching Frequency vs RT/CLK Resistance
High Frequency Range
TPS54340 C033_SLVSBN0.png
VIN = 12 V
Figure 9. EA Transconductance During Soft-Start vs Junction Temperature
TPS54340 C036_SLVSBN0.png
VIN = 5 V IEN = Threshold +50 mV
Figure 11. EN Terminal Current vs Junction Temperature
TPS54340 C037_SLVSBN0.png
VIN = 12 V
Figure 13. EN Terminal Current Hysteresis vs Junction Temperature
TPS54340 C039_SLVSBN0.png
VIN = 12 V
Figure 15. Shutdown Supply Current vs Junction Temperature
TPS54340 C041_SLVSBN0.png
VIN = 12 V
Figure 17. VIN Supply Current vs Junction Temperature
TPS54340 G018_SLVSBB4.pngFigure 19. BOOT-SW UVLO vs Junction Temperature
TPS54340 C045_SLVSBN0.png
VIN = 12 V TJ = 25°C
Figure 21. Soft-Start Time vs Switching Frequency
TPS54340 C030_SLVSBN0.png
ƒsw (kHz) = 92417 x RT (kΩ) -0.991
RT (kΩ) = 101756 x ƒsw (kHz) -1.008
Figure 6. Switching Frequency vs RT/CLK Resistance
Low Frequency Range
TPS54340 C032_SLVSBN0.png
VIN = 12 V
Figure 8. EA Transconductance vs Junction Temperature
TPS54340 C034_SLVSBN0.png
VIN = 12 V
Figure 10. EN Terminal Voltage vs Junction Temperature
TPS54340 G012_SLVSBK0.gif
VIN = 12 V IEN = Threshold +50 mV
Figure 12. EN Terminal Current vs Junction Temperature
TPS54340 G013_SLVSBB4.png
VIN = 12V
Figure 14. Switching Frequency vs FB
TPS54340 C040_SLVSBN0.png
TJ = 25°C
Figure 16. Shutdown Supply Current vs Input Voltage (VIN)
TPS54340 G018_slvsBK0.gif
TJ = 25°C
Figure 18. VIN Supply Current vs Input Voltage
TPS54340 G019_SLVSBB4.pngFigure 20. Input Voltage UVLO vs Junction Temperature