SLUAAX9 June   2025 BQ25756

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2MOSFET Power Losses in Buck and Boost Chargers
    1. 2.1 Buck Mode Losses
    2. 2.2 Boost Mode Losses
    3. 2.3 Closing Thoughts for FET Losses
  6. 3Evaluating MOSFETs Using the Design Calculator
    1. 3.1 Correlating MOSFET Data Sheet Parameters With the Design Calculator Parameters
    2. 3.2 Design Calculator MOSFET Comparison Example
  7. 4BOM Evaluation
  8. 5Summary
  9. 6References

Abstract

This application notes aims to aid engineers in the selection of the switching MOSFETs for the BQ2575x family of devices and understand the origin of power losses from MOSFETs. The MOSFETs in use can play a large role in the overall efficiency of the system. MOSFET selection depend heavily on the system parameters, such as the switching frequency, output current, output voltage, and input voltage.