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BQ25713B: over discharger battery re-activation

Zach Xia
Expert 8455 points
Part Number: BQ25713B
Other Parts Discussed in Thread: BQ25713

Hi,

My customer wants to know if they can config the BQ device for re-activation of the over discharge battery.

When the battery is over discharged(0V), it will need 6.6V to reactivate. Right now, they see the output of the BQ device is 6.18V(max-charge-voltage = <8912000>;)

How could we config the output to be 6.6V while the bat voltage=0?

Regards,

Zach

  • 0
    TI__Intellectual 1805 points

    Hi Zach,

    What do you mean by re-activation? You can configure voltage on VSYS by setting the Minimum System Voltage Register to the voltage you need. When the battery falls below the Minimum System Voltage, BQ25713 will maintain the Minimum System Voltage on VSYS.

    Best Regards,

    Jacob

  • 0 in reply to Jacob Rook
    TI__Expert 8455 points

    Hi Jacob,

    The "re-activation" means when the battery is fully discharged/ the bat is dead (output =0V, caused by internal protection circuit inside the bat pack?), you will need a voltage higher than the protection threshold to start the charging process to the battery. Otherwise, if the voltage provided by the BQ is lower, the battery will not be charged and remain dead.

    Such that, we will need the charger to output a voltage 6.6V when there is no load (since Vbat=0V).

  • 0 in reply to Zach Xia
    TI__Intellectual 1805 points

    Hi Zach,

    Okay, if you set the Minimum System Voltage register to 6.6 V like mentioned above then this should fix your issue. When the battery is below the Minimum System Voltage, the BATFET operates in linear mode and the system is regulated above the Minimum System Voltage setting.  

    Best Regards,

    Jacob