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BQ76952: Will this part perform well at a heavy load (30A during testing)?

Lauren Mayfield
Expert 7875 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ76200,

Hi team,


I had a customer ask some questions about this part.

1. Is there a pre-silicon version of this part that was previously released and contained a couple bugs? Does the current version not have any known issues or bugs that customers should be aware of?

2. They were having an issue with a different part, BQ76200, where under heavy load the part was taking too long to shutdown and was damaging the FET. Their normal operation is 6-7A but they tested it at 30A where it was experiencing the shutdown. They noticed the internal schematic of this part looks similar to the BQ76200 so they wanted to know if they would encounter the same issues, and if so how to mitigate them?

Thank you!
Lauren

  • 0
    TI__Genius 10830 points

    hi Lauren,
    Let me answer your 1st question: we did sample, when BQ76952 was under PREVIEW, a preliminary version (PBQ76952 with P for Prototype) which had some issues which we documented in the section "device support" of the initial datasheet. The current version (ACTIVE, aka BQ76952PFBR) doesn't have known bugs.

    I'll loop in a colleague for your 2nd question.

  • 0 in reply to David Hien
    TI__Guru 54715 points

    Hi Lauren,

    #2 Certainly the load should switch at normal as well as higher loads including short circuit.  The BQ76200 and BQ76952 are similar in the FET drivers in that they use a charge pump with external capacitor as a supply for the high side drivers.  The BQ76952 uses a different driver mechanism to turn off the discharge FETs with the DSG output. The BQ76952 drives DSG below the sensed PACK+ level, and the large sensing resistance avoids any filter capacitor so the LD pin can more closely follow the PACK+ level. The application note https://www.ti.com/lit/pdf/sluaa09  may be helpful for your customer.