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BQ40Z50-R1: Quiescent current is not meet the datasheet

Statham Su
Genius 4990 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQ40Z50

Hello Sir:

We are try to measure the quiescent current of BQ40z50 EVM when sleeping mode.

But the quiescent is always down to around 120uA. (CHG FET off)

Please refer the figure as below.

And we check the datasheet which shows the typical value is 75uA.

 

Can you provide some recommendations on it?

Please let us know how to decrease the quiescent current?

Thanks a lot.

  • 0
    TI__Guru** 105760 points

    Hello Statham,

    Can you show how you are measuring the current consumption and a scope capture of the current consumption? Was the test with VCC = 14.4V?

    Is the value an average value of the current? Having larger max current is normal for the gauge.

    Changing the sampling period of voltage and current in sleep mode can help reduce current in sleep mode.

    Sincerely,

    Wyatt Keller 

  • 0 in reply to Wyatt Keller
    Genius 4990 points

    Hi Keller:

    Thanks a lot your recommendations.

    Please refer the reply as below.

    1. we use a electrical meters and series the B- point of EVM. I can post the photo but it's hard to understood how to connect by this photo.

    2. Even if we use 2s or 4s cell that current consumption is around 120uA.

    3. Yes is the average value, the peak current will be higher, it will over 200uA.

    4. Yes it help reduce current but which is still around 120uA.

    Do you have idea how to downgrade it?

    Please provide your recommendations.

    Thanks a lot.

  • 0 in reply to Statham Su
    TI__Guru** 105760 points

    Hello Statham,

    Can you provide a scope capture of the current peaks/minimums so we can see where the current consumption may be coming from?

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Genius 4990 points

    Hello Keller:

    I think that is hard work for us.

    Due to the quiescent current is under 1mA.

    We have no this high accuracy scope, do you have other way to check this issue?

    Please let me know your recommendations.

    Thanks a lot.