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

8.2.3 Application Curves

TPS54340B ac_G001_lvsBK0.gifFigure 33. Load Transient
TPS54340B ac_G003_lvsBK0.gifFigure 35. Start-up With VIN
TPS54340B ac_G005_lvsBK0.gif
IOUT = 3.5 A
Figure 37. Output Ripple CCM
TPS54340B ac_G007_lvsBK0.gif
No Load
Figure 39. Output Ripple PSM
TPS54340B ac_G009_lvsBK0.gif
IOUT = 100 mA
VIN = 12V
Figure 41. Input Ripple DCM
TPS54340B ac_G0046_lvsBK0.gif
VOUT = 3.3 V ƒsw = 600 kHz
Figure 43. Efficiency vs Load Current
TPS54340B ac_G0048_lvsBK0.gif
VOUT = 5 V ƒsw = 600 kHz
Figure 45. Efficiency vs Load Current
TPS54340B ac_G0050_lvsBK0.gif
VIN = 12 V VOUT = 3.3 V IOUT = 3.5 A
Figure 47. Overall Loop Frequency Response
TPS54340B ac_G0052_lvsBK0.gif
VOUT = 3.3 V IOUT = 3.5 A ƒsw = 600 kHz
Figure 49. Regulation vs Input Voltage
TPS54340B ac_G002_lvsBK0.gifFigure 34. Line Transient (8 V to 40 V)
TPS54340B ac_G004_lvsBK0.gifFigure 36. Start-up With EN
TPS54340B ac_G006_lvsBK0.gif
IOUT = 100 mA
Figure 38. Output Ripple DCM
TPS54340B ac_G008_lvsBK0.gif
IOUT = 3.5 A
Figure 40. Input Ripple CCM
TPS54340B ac_G010_lvsBK0.gif
VIN = 5.5 V No Load
VOUT = 5 V EN Floating
Figure 42. Low Dropout Operation
TPS54340B ac_G0047_lvsBK0.gif
VOUT = 3.3 V ƒsw = 600 kHz
Figure 44. Light Load Efficiency
TPS54340B ac_G0049_lvsBK0.gif
VOUT = 5 V ƒsw = 600 kHz
Figure 46. Light Load Efficiency
TPS54340B ac_G0051_lvsBK0.gif
VIN = 12 V VOUT = 3.3 V ƒsw = 600 kHz
Figure 48. Regulation vs Load Current