• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 276 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

BQ25672: Unable to charge battery with battery protection circuit.

BQ25672: Unable to charge battery with battery protection circuit.

Jason Urquhart
Prodigy 40 points
Part Number: BQ25672

Tool/software:

Hello,

We have more reports of these chips showing the same behaviour.
I have just looked up the date code on reel that we purchased and it shows (D) 2141+5
This reel was purchased in June of 2024 directly from TI.

Can you please identify what the chip markings are?
We see:
BQ25672
TI 2B8
AL9V

What do the second and third rows mean?

Could you please do some further investigation and let us know what a safe date code would be to use?

Thanks,
Jason

  • 0
    TI__Guru**** 166996 points

    Hi Jason,

    I have submitted to my test manager to investigate. The 2nd and 3rd rows are the lot trace code.  In the meantime, to confirm it is the same issue, can you provide a scope plot of V(BAT), V(SYS) and I(BAT) if possible?  There a few pack protectors on the market with turn on voltages that are higher than the 672's ~2.5V x cell count voltage at turn on.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 40 points

    Hi Jeff,

    Unfortunately I don't have access to the chip at this moment. If I am able to get it back I'll look into this.

    I have another lot I'd like checked please:

    BQ25672
    TI 1A8
    A9G0     <--that last digit is a zero

    If this event happens, is there any way to recover the battery or do we need to replace the chip?

    I am looking into the pack protector turn on voltage and will report back as soon as I know what that is.

    Thanks,
    Jason

  • 0 in reply to Jason Urquhart
    TI__Guru**** 166996 points

    Hi Jason,

    2B8AL9V should have the test fix and be okay.  But 1A8A9G0 does not so 10% of those units could get stuck trickle charge. The remaining 90% will work fine and not have a problem.  You can submit the failing 10% for return.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 40 points

    Hi Jeff,

    This is good news!

    Can you assure me that any devices purchased directly from TI in the future will be tested with the new test procedure?

    I ask because on a previous post, the person said that the fix was implemented in 2023 yet the date code from our reel seems to indicate 2021.

    I just want to be sure we don't get a bad lot of ICs if we purchase in the future.

    Thanks,
    Jason

  • 0 in reply to Jason Urquhart
    TI__Guru**** 166996 points

    Hi Jason,

    Yes, all ICs being manufactured now have the test fix.  It is possible that our inventory was not purged completely and that is why you got units without the test fix.

    Regards,

    Jeff