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Original question:

BQ25703AEVM-732: Learn mode

BQ25703AEVM-732: Reverse mode

Thu Nguyen
Prodigy 130 points
Part Number: BQ25703AEVM-732
Other Parts Discussed in Thread: BQ25703A

Hi,

I would like to know the expected Vsys when the BQ25703A is in reverse mode and there are 4-cell 18650 plugged in? The users' guide mentions Vsys is regulated 160mV above Vbat in forward mode. So what is Vsys in reverse mode?

Thank you,

Thu

  • 0
    TI__Mastermind 24075 points

    Hi Thu,

       In reverse OTG mode, the VBAT voltage (technically VSYS as VSYS net is the input right before Q4) is input to the converter and the output is on VBUS. In this stage, the only difference between VBAT and VSYS is the PFET between them, so VSYS will track VBAT - voltage drop across RDSon of PFET driven by BATDRV.