SLVSBB7E May   2012  – November 2015 TPS54061


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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. 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  Error Amplifier
      4. 7.3.4  Voltage Reference
      5. 7.3.5  Adjusting the Output Voltage
      6. 7.3.6  Enable and Adjusting UVLO
      7. 7.3.7  Internal Slow-Start
      8. 7.3.8  Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      9. 7.3.9  Selecting the Switching Frequency
      10. 7.3.10 Synchronization to RT/CLK Pin
      11. 7.3.11 Overvoltage Protection
      12. 7.3.12 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation Near Minimimum Input Voltage
      2. 7.4.2 Operation With Enable Control
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 CCM Application
        1. Design Requirements
        2. Detailed Design Procedure
          1. Selecting the Switching Frequency
          2. Output Inductor Selection (LO)
          3. Output Capacitor
          4. Input Capacitor
          5. Bootstrap Capacitor Selection
          6. UVLO Set Point
          7. Output Voltage and Feedback Resistors Selection
          8. Closing the Loop
        3. Application Curves
      2. 8.2.2 DCM Application
        1. Design Requirements
        2. Detailed Design Procedure
          1. Designing an Efficient, Low-Output Current Power Supply at a Fixed Switching Frequency
          2. Closing the Feedback Loop
        3. Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

5 Pin Configuration and Functions

TPS54061 pinout_lvsbb7.gif

Pin Functions

BOOT 1 O A bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor is below the minimum required by the output device, the output is forced to switch off until the capacitor is refreshed.
VIN 2 I Input supply voltage, 4.7 V to 60 V.
EN 3 I Enable pin with internal pull-up current source. Pull below 1.18 V to disable. Float to enable. Adjust the input undervoltage lockout (UVLO) with two resistors, see the Enable and Adjusting Undervoltage Lockout section.
RT/CLK 4 I Resistor Timing and External Clock. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the mode returns to a resistor frequency programming.
VSENSE 5 I Inverting input of the transconductance (gm) error amplifier.
COMP 6 O Error amplifier output and input to the output switch current comparator. Connect frequency compensation components to this pin.
GND 7 Ground
PH 8 O The source of the internal high-side power MOSFET and drain of the internal low-side MOSFET
Thermal Pad 9 GND pin must be electrically connected to the exposed pad on the printed circuit board for proper operation.