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BQ25730: Switching actions of FETS

Rajendar Reddy Beeram
Prodigy 40 points
Part Number: BQ25730
Other Parts Discussed in Thread: BQ24800

Tool/software:

We have been using bq25730 battery charger IC in our project, but while operating in buck mode all four MOSFET's are switching instead of Q1 & Q2 switching and Q3 off and Q4 ON. May I know what is causing this abnormal behaviour. Thanks in advance

  • 0
    TI__Mastermind 32695 points

    This is normal. The BQ25730 buck-boost charge controller utilizes all four switches during startup and light load conditions. BQ25730 won’t start up properly if two boost leg MOSFETs are removed. BQ24800 is a buck charger with hybrid power boost functions, which can be used in buck only charger applications.