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BQ24070: Input standby current to high

Ma Bo
Prodigy 30 points
Part Number: BQ24070

Hi,

We are using BQ24070 and we are facing a problem.

Starting condition:

No input source, no load.

After connecting the battery the input standby current is about 200uA an rises in a couple of minutes up to 20-30mA.

Any hints to solve this problem?

Thanks,

Ma Bo

  • 0
    TI__Mastermind 21590 points

    Did anything trigger the current increase?

    Whats the battery voltage and OUT voltage?

  • 0 in reply to Raheem
    Prodigy 30 points

    No, there is no trigger.

    Connect the battery without load and without Vin. The device starts with a standby current of approx. 200 uA. The current becomes higher within approx. 10 minutes, whereby the current fluctuates. A few seconds e.g. 4mA then 2mA then 6mA again, where it gets more and more. Vbat and Vout are the same at low currents, at approx. 10mA Vout is 10mV lower than Vbat. If the battery is briefly disconnected, the current consumption is immediately the same, but if the battery is disconnected for a longer period, the current consumption starts again at 200uA and then begins to increase again.

    Regards,

    Ma Bo

  • 0 in reply to Ma Bo
    TI__Mastermind 21590 points

    Hello,

    Can you check for shorts on the board?

  • 0 in reply to Raheem
    Prodigy 30 points

    Hello,

    No shorts on the board found but after re-soldering the BQ24070 the problem was solved. Maybe a short under the IC. Standby current is now 1uA. It works!

    Thanks a lot!

    Regards,

    Ma Bo