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BQ2969: Technical question

Ryker She
Expert 4560 points
Part Number: BQ2969
Other Parts Discussed in Thread: BQ2962

Tool/software:

Hi expert,

My customer (CosMx) is evaluating BQ2969 and there are two technical questions as below. Appreciate your reply. 

  • What's the REG current output of BQ2969? R&D found the REG current output of BQ2969 is worse than BQ2962. For BQ2969, the REG voltage would be drop to 0V when REG current is 4-5mA. But for BQ2962, the REG voltage would drop to 0V when the REG current is 5-6mA. (CREG=0.1uF, VD=16V).
  • For the BQ2969 and BQ2962, the test results of OV delay time are different every time (still between 5.2-7.8s). For example, first test result is 6.5s, second is 6.6s, third is 6.4s... But for other competitors, the OV delay time is fixed for specific IC. For example, the first IC is always 6.5s, the second IC is always 6.6s, the third IC is always 6.4s... Could you share some insight about this difference? 

Best Regards,

Ryker

  • 0
    TI__Mastermind 42060 points

    Hello Ryker,

    Ryker She said:
    What's the REG current output of BQ2969? R&D found the REG current output of BQ2969 is worse than BQ2962. For BQ2969, the REG voltage would be drop to 0V when REG current is 4-5mA. But for BQ2962, the REG voltage would drop to 0V when the REG current is 5-6mA. (CREG=0.1uF, VD=16V).

    This is not correct, the REG performance of the BQ2969 is better than the BQ2962. BQ2962 is characterized to have a regulated voltage to up-to 2-mA. The BQ2969 is characterized to have a regulated voltage to up-to 3-mA. This means that we warranty the normal regulated voltage up-to these currents. We cannot warranty a stable regulated current for the BQ2962 above 2-mA.

    The short-circuit current is a different specification, and it shows that it is possible for the BQ2969 short-circuit current (Current when REG shorts to Vss) to be slightly lower than the BQ2962, however, this is unrelated to the actual regulator performance.

    Ryker She said:
    For the BQ2969 and BQ2962, the test results of OV delay time are different every time (still between 5.2-7.8s). For example, first test result is 6.5s, second is 6.6s, third is 6.4s... But for other competitors, the OV delay time is fixed for specific IC. For example, the first IC is always 6.5s, the second IC is always 6.6s, the third IC is always 6.4s... Could you share some insight about this difference? 

    We guarantee the datasheet delay accuracy specifications. It may be possible they vary slightly, but that sounds like it is within specifications.

    Best Regards,

    Luis Hernandez Salomon