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BQ24725A: remaining voltage concern

Sam Ting
Intellectual 2720 points
Part Number: BQ24725A

Hi team,

We've a design with 4 bq24725A chargers for battery docking station application. But we found there are some remaining voltages at battery connectors when the batteries are disconnected.
We found it is workable to pull the ACDET pin to low and add some dummy load . However, we're looking for the software solutions/ SMBus commands. Could you please provide the solutions? Thanks!

Best regards,
Sam Ting

  • 0
    TI__Genius 11850 points

    Hi Sam,

    You can try forcing a BATOVP condition in order to discharge the output capacitors.

    Set the ChargeVoltage() register (0x15) to a low value so that the residual voltage on the output capacitors exceeds 104% of the ChargeVoltage(). This triggers BATOVP, and the device will turn on a 4 mA current sink from SRP to GND in order to discharge the output capacitors.

    For the BQ24725A, note that ChargeVoltage() = 0 V will not trigger BATOVP. Instead, you can set the ChargeVoltage() to some other value that is sufficiently low for your application.

    This behavior is described in Section 8.4.14 of the datasheet:

    Best regards,

    Angelo