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BQ25713: BQ25713 Buck only mode

Joe DiBartolomeo
Expert 3115 points
Part Number: BQ25713
Other Parts Discussed in Thread: BQ24765, BQ24780S

All,


Customer is using the BQ25713 in Buck only mode so does not need Boost FET’s. Can I leave the driver pins for the Boost FET’s (SW2, HIDRV2, LODRV2) floating;?  Any issue with power path due to not having Boost FET’s.

Thanks,

Regards,

Joe

 

  • 0
    TI__Expert 3320 points

    Hi Joe,

        BQ25713 is defined for buck-boost operation, the operation status switches seamlessly between BUCK-BUCK_BOOST-BOOST. Charger will determined which status automatically. When VIN is close to VBAT, even still  a little higher than VBAT the charger will go into BUCK-BOOST mode.

         On the other  hand the boost high side FETs is also employed to block power flow from battery to VBUS. If we remove the boost FETs then battery will pull up VBUS through buck high side FETs body diode.

         Because of above reason, we don't recommend to use BQ25713 for buck only converter.  For your information we do have buck-only type charger like BQ24780s(Controller) and BQ24765(Integrated FETs) to fit better for your application. 

    Regards