SDAA165 January   2026 TPS61287

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Key Parameters for Power MOSFET Selection
    1. 2.1 Static Characteristics
    2. 2.2 Dynamic Characteristics
    3. 2.3 Thermal Parameters
  6. 3Introduction to the MOSFET Selection Tool
    1. 3.1 Input MOSFET Parameters to Calculation Tool
    2. 3.2 Review the Results
  7. 4Calculator Tool MOSFET Selection Example and Bench Evaluation
  8. 5Summary
  9. 6References

1 Introduction

The TPS61287 is a high-power density, synchronous boost converter that integrates the high side synchronous rectifier MOSFET and uses an external low side MOSFET to provide a high efficiency and small size design. The TPS61287 has a wide input voltage range from 2V to 23V and the output voltage covers up to 25V with 20A switching valley current capability. The TPS61287 uses an adaptive constant on-time valley current control topology to regulate the output voltage. Under moderate to heavy load condition, the TPS61287 operates in pulse width modulation (PWM) mode. There are two optional modes in light load by configuring the MODE pin: Auto PFM mode to improve light-load efficiency and Forced PWM to avoid audible noise and other problems caused by low switching frequency. The switching frequency in the PWM mode is 320kHz. The TPS61287 provides 27V output overvoltage protection, cycle-by-cycle overcurrent protection, and thermal shutdown protection.

TPS61287 Functional Block DiagramFigure 1-1 TPS61287 Functional Block Diagram

This application note is a guide for the selection of the external MOSFETs used in combination with the boost device TPS61287.