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BQ25619: How to increase charging current ?

Philip Jones31
Prodigy 110 points
Part Number: BQ25619

Tool/software:

I am working on a design that uses a BQ25619 charger chip.

Unfortunately my hardware designer made an error and pulled PSEL high so the chip things it is connected to a USB socket when it is actually connected to a 5v 2A power supply.

Because of this error the chip sets VBUS_STAT (in register 08) to '001' - USB host SDP (500mA) and  consequently charging currents appear to be limited to below this value.

I have tried changing IINDPM (in register 0) and ICHG (in register 2) but the best I seem to get is a charging current of about 450mA (this is measured by a BQ27542 chip that is embedded in the battery pack).

Can you advise me if there is any way I can persuade this chip to give me a changing current of 1000mA or more without having to change the hardware (i.e. pull PSEL low).

Thanks and Kind Regards

PhilipJ

  • +1
    TI__Mastermind 40705 points

    Hello Philip,

    Can you try disabling the watchdog and setting INDET_EN = 0?

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Prodigy 110 points

    Hi Mike Emanuel,

    thank you for your reply.

    INDET_EN is already set to '0' it is the default state after power-up and I try to leave as much of the chip in it's default settings as possible.

    Disabling the watchdog seems to be the key! I found last night that I could program the IINDPM in register 0 and ICHG in register 2 to 1000mA and the charging current increased to this value, but then later it would drop back down to 340mA.

    Disabling the watchdog allows it to stay at the programmed level.

    Thank you for your assistance.

    Kind regards

    PhilipJ