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INT BQ2003 operating temperature

Rocson He
Intellectual 1830 points
Other Parts Discussed in Thread: BQ2000, BQ2003

Hi, team,

Now we have one customer application of E-call for Automotive. and need NiMh charger with -20 -85 degree C. They have used BQ2000 before for T-box application, but with only 0-70 degree operating temperature. I looks into BQ2003 spec, and find its operating temperature is also 0-70. But the -40 -85 degree is under bias on page9? What does it means?

So do we have such NiMh charger solution that meets this application? Thanks.

  • 0
    TI__Mastermind 31120 points

    For the bq2003, under bias means that the IC was powered up during the test.

    It may not help any, but the bq2000 can be used at least up to 100C even though the range is listed as 0 to 70C.  The typical charging of a battery pack takes place between 0 and 50C so the thought was why collect the data points way outside the desired temperature range, since a larger range may loosen the specs by another 1% or so.  The silicon process that the IC was developed in is qualified for 125C operating temperature so the silicon would not have any issue operating at these higher temperatures.

    With this said, we can't go back and modify the data sheet since we did not collect the data and verify the spec ranges.

    Also note that the battery manufacturer's recommendations often do not want their cell charged at higher temperatures.

    Note that the storage temperature on the bq2000 is 125C.  Does the customer want to continue charging up to 85C?

    The customer can however test a few units above their desired temperature range and verify there are no issues.  The customer will have to assume any responsibility for using the IC outside the data sheets range.