SLVSBB7E May   2012  – November 2015 TPS54061

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 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. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 CCM Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Selecting the Switching Frequency
          2. 8.2.1.2.2 Output Inductor Selection (LO)
          3. 8.2.1.2.3 Output Capacitor
          4. 8.2.1.2.4 Input Capacitor
          5. 8.2.1.2.5 Bootstrap Capacitor Selection
          6. 8.2.1.2.6 UVLO Set Point
          7. 8.2.1.2.7 Output Voltage and Feedback Resistors Selection
          8. 8.2.1.2.8 Closing the Loop
        3. 8.2.1.3 Application Curves
      2. 8.2.2 DCM Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Designing an Efficient, Low-Output Current Power Supply at a Fixed Switching Frequency
          2. 8.2.2.2.2 Closing the Feedback Loop
        3. 8.2.2.3 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 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

1 Features

  • Integrated High-Side and Low-Side MOSFET
  • Diode Emulation for Improved Light Load Efficiency
  • Peak Current Mode Control
  • 90-µA Operating Quiescent Current
  • 1.4-µA Shutdown Supply Current
  • 50-kHz to 1100-kHz Adjustable Switching Frequency
  • Synchronizes to External Clock
  • Internal Slow-Start
  • 0.8 V ±1% Voltage Reference
  • Stable With Ceramic Output Capacitors or Low-Cost Aluminum Electrolytic
  • Cycle-by-Cycle Current Limit, Thermal, OVP and Frequency Foldback Protection
  • VSON-8 Package, 3 mm × 3 mm With Thermal Pad
  • –40°C to 150°C Operating Junction Temperature

2 Applications

  • 4 to 20-mA Current-Loop Powered Sensors
  • Low Power Standby or Bias Voltage Supplies
  • Industrial Process Control, Metering, and Security Systems
  • High Efficiency Replacement for High Voltage Linear Regulators

3 Description

The TPS54061 device is a 60-V, 200-mA, synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs. Current mode control provides simple external compensation and flexible component selection. The non-switching supply current is 90 µA. Using the enable pin, shutdown supply current is reduced to 1.4 µA.

To increase light load efficiency the low-side MOSFET emulates a diode when the inductor current reaches zero.

Under voltage lockout is internally set at 4.5 V, but can be increased using two resistors on the enable pin. The output voltage startup ramp is controlled by the internal slow-start time.

The adjustable switching frequency range allows efficiency and external component size to be optimized. Frequency foldback and thermal shutdown protects the part during an overload condition.

The TPS54061 enables small designs by integrating the MOSFETs, boot recharge diode, and minimizing the IC footprint with a small 3.00 mm x 3.00 mm thermally enhanced VSON package

The TPS54061 is supported in the WEBENCH™ Designer at www.ti.com.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS54061 VSON (8) 3.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

TPS54061 fp_simp_schem_lvsbb7.gif

Efficiency vs Load Current

TPS54061 frontpage_lvsbb7.gif