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BQ25150: Detecting overconsumption with the BQ25150

Jonathan Geronga
Expert 7930 points
Part Number: BQ25150

Hi Team,

I would like to ask your help in our customer situation below BQ25150:
According to the customer:

- When they plug a battery to the BQ, they can see between 40 and 50uA of current consumption whereas it is supposed to consume only 10nA in ship mode (default mode when a battery is plugged).
- When the voltage of the battery get above 4V, the BQ consumes around 440uA
- When the voltage of the battery get back below 3.86V, le consumption comes back to 40uA

Here is the schematic of the customer for BQ25150 with a note that "There is no VUSB present yet":


Please let me know if you have other questions with the customer.

Thanks,

Jonathan

  • 0
    TI__Genius 12475 points

    Hi Jonathan,

    This almost sounds like the chip was awake and in operation. Can they measure VDD and PMID voltage when in this mode?

    After how long are these parameters measured once the battery is connected?

    Regards,

    Gautham

     

  • 0 in reply to Gautham
    Prodigy 30 points

    Hi,

    We are the customers who had this issue. We found finally that it was our fault: we use a MOSFET connected to the battery and IN controlled by LDO output to manage the dead battery situation (we do not have the access to PMID). In fact the intrinsinc diode of the transistor connect the battery to the IN pin of the BQ25150, the overconsuption came from that.

    Thanks for your quick answer, and sorry for the "fake" issue !

    Best regards,

    Guilhem