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BQ32000: Backup supply current is 100 times more

Mohammed Azlum
Intellectual 835 points
Part Number: BQ32000

Hi,

I'm using BQ32000DR in my design. Also functionally it worked fine. But I have observed that, during backup time, RTC controller takes 230uA from the RTC battery. May I know the reason for this ?

How to reduce this current to expected value ?

Regards,

Azlum

  • 0
    TI__Expert 4415 points
    Hi Azlum,

    I have notified an engineer to respond to your question.

    Regards,
    -Tim
  • 0 in reply to Tim Chao Li
    TI__Guru** 114905 points
    Hi Azlum,

    Please see section 8.2.2.3 of the datasheet, which states:

    8.2.2.3 Utilizing the Backup Supply
    In order for the bq32000 to achieve a low backup supply current as specified in the Electrical Characteristics, the
    VCC pin must be initialized after every total power loss situation. Initialization Is achieved by powering on VCC with
    a voltage between 3 to 3.6 V for at least 1 ms immediately after the backup supply is connected. If the VCC is not
    powered on while connecting the backup supply, then the expected leakage current from VBACK will be much
    greater than specified.