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BQ25756: Power management forum

PYTsai
Genius 11675 points
Part Number: BQ25756
Other Parts Discussed in Thread: BQ25750, BQ25820

Tool/software:

Hi 

My customer would like to use BQ25756.

their schematics as below 

In their use cases, the Vin will always be > 9V and the battery is 1 cell Li-Ion battery.

Therefore, in this application, the BQ25756 will be operated in Buck mode only.

In the Buck mode only application, do we still need the Q3 and Q4 ? Will the charger still be functional if we don't have the Q3 and Q4 ?

  • +1
    TI__Mastermind 31305 points

    Hello PY,

    Thanks for working on this. The BQ25756 will not work without all 4 switching FETs.

    You can use the BQ25820 instead. The BQ258520 is a buck-only version of the BQ25750 and can be operated without the power path FETs.

    Let me know if you have any questions about this.

    Best Regards,
    Ethan Galloway