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Original question:

BQ24092

BQ24092: BQ24092

user267304
Prodigy 20 points
Part Number: BQ24092


When I disconnect the input voltage PIN1 (IN) by removing the USB cable from my device, there is around 24mA of reverse current. This current drain the battery of my device. My input capacitor is 1uF. Notes that this behavior is intermittent, sometime there is no reverse current and sometime 24mA. If I disconnect and reconnect the battery, the reverse current drop to 0mA as expected. How can I avoid this behavior?

  • 0
    TI__Guru* 76666 points
    Hello
    Could you send a schematic of the circuit.
    Also describe the steps to duplicate the problem.
    The input voltage is removed during charge, which phase of charge is the battery in? Battery voltage and input current before input removed.
  • 0 in reply to Bill Johns
    Prodigy 20 points

    The battery is about 3.7V and the charging current is between 850mA and 1000mA (when connected to a USB wall adapter). I don't know what exactly is the charging phase, but after 15 seconds I disconnect the USB cable while monitoring the batterie current (I have an ammeter connected in series with the gnd wire of the batterie).  I sent the schematic. Another weird thing is when I the reverse current is 0mA as expected, if I connect the the USB cable ground pin only the reverse current  increase to about -24mA and stay there even I disconnect the USB cable. 

    Thanks

  • 0 in reply to user267304
    TI__Guru* 76666 points
    Sorry for the late reply.
    I have been looking at this in the lab and looking at the circuit. Cannot duplicate the problem, have not seen any current from battery after the input is removed.
    Are you still seeing the problem?
  • 0 in reply to Bill Johns
    TI__Guru* 76666 points
    Are you still seeing the reverse current?