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BQ32000: the supply current of Iback with battery only

Antony Fu
Expert 3345 points
Part Number: BQ32000
Other Parts Discussed in Thread: BQ32002

Hello team,

My customer is using BQ3200 now, and we are checking the Iback spec with battery only, so could you kinldy help us check the Iback value when VCC=0?

We tested it and found it is 80uA now, but from the datasheet, it is 1.2uA. so why we  issue a pulse on VCC during testing this value?

Thanks,

Antony

  • 0
    TI__Genius 16845 points
    Hi Antony,

    Take a look at section 8.2.2.3 of the datasheet. You must initialize the VCC pin after any total power loss scenario by issuing a pulse on VCC for 1ms immediately after the backup supply is connected. This will reduce the backup supply current significantly.

    Unfortunately I don't have a board handy to check the the customer measurement, but after you issue the pulse on VCC Iback will reduce considerably.

    Kind regards,
    Lane
  • 0 in reply to Lane Boyd
    TI__Expert 3345 points

    Hi  Lane,

    Many thaks for your support.

    Customer already initialized the VCC pin with one pulse, the high level is no problem, and the period is also large than 1ms, but the Iback is 80uA too. Customer did this after a long time after the backup supply connected, so whether this is the issue?  And already let them initalize the VCC pin immediately once the backup supply is connected, i am not sure whehther they make it happens.

    BTW, whether BQ32002 has same requirment?

    Thanks,

    Antony

  • 0 in reply to Lane Boyd
    TI__Expert 3345 points
    Hi Lane,

    pls refer to below, we can not get this data using the test method of datasheet, so it has special sequence? and all the Iback is same as figure2 and figure3, so what's the mean of these two figures?

    Thanks,
    Antony
  • 0 in reply to Antony Fu
    TI__Genius 16845 points
    Hi Antony,

    This device was recently transferred from another group into mine, so I am not an expert on BQ3200x but I will try to help with this issue.

    Do you observe this consumption (80uA) across several boards and units? Do you measure this consumption after each total power loss situation?

    Figure 2 shows current consumption when VCC = 2V, and Figure 3 shows consumption when VCC = 3.3V.

    Kind regards,
    Lane