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bq24610 charging/switching issue

Ronald Deang
Intellectual 260 points
Other Parts Discussed in Thread: BQ24610

Hi, I'm having problems with a bq24610. When I have a load connected on VSYS and no battery on VBAT, the board runs as expected and draws about 2.1A from the power supply. But as soon as I connect a battery with the VSYS load still connected, the power supply current draw drops to 1A. The power supply can supply 5.2A max. LEDs powered by VREF turn off so I think VREF drops (I've seen this happen before). I also have LEDs indicating STAT1 and STAT2 and these both turn off. I  also see the battery voltage begin to drop. This sounds like the bq24610 is not switching correctly and it is drawing power from the battery instead of the power supply. Does anyone know what could be wrong?

Thanks,

Ron

  • 0
    Intellectual 260 points

    So I double checked the voltage on the battery pack, and it looked higher than usual. After depleting the battery for a while (with the load on VSYS and power supply turned off), I flipped on the power supply, and the board worked as it should.

    I'm guessing since the VBAT voltage was too high, it generated a VCC higher than the power supply and it used the pack as the primary source of power. Can anyone confirm if this could be true?

  • 0 in reply to Ronald Deang
    TI__Guru 56650 points

    When battery voltage is higher than 104% of VREG, the bq24610 charger runs into BAT OVP protection mode: the charger turns off the switching FETs.

    If VBAT is even higher than VCC, the bq24610 charger runs into sleep mode. The switching FETs are turned off. ACFET is also turned off. BATDRV is on. So, it is true.