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

5 Summary

The BQ2575x family of devices can be used to create efficient charger systems for a myriad of applications. The efficiency of these systems can vary based on the operating conditions of the system and BOM selection, especially the MOSFET selection. The data sheet parameters of the MOSFET need to be reviewed and considered carefully, especially the gate charge parameters and the RDS(ON). How the MOSFET is used can impact these parameters so the operating conditions like the switching frequency, the gate drive voltage, and the output load need to be considered as well.