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BQ76920: FMEA Documentation

Dattatreya Roy
Prodigy 40 points
Part Number: BQ76920
Other Parts Discussed in Thread: BQ76930, BQ77PL900, BQ76952

Tool/software:

Hello,

I would like to know if there is an FMEA or safety analysis documentation available for the following ICs -
       - BQ76920
       - BQ76930
       - BQ77PL900
       - BQ76952
Best regards,
Dattatreya
  • 0
    TI__Mastermind 38570 points

    Hello Dattatreya,

    Only the BQ76952 has pinFMEA and safety-related documentations. You can request access in the https://www.ti.com/product/BQ76952 page:

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 40 points

    Hi Luis,

    Thank you for the info. Doesn't BQ77PL900 also have a similar FMEA documentation available? 

    Also if an AFE IC does not have a FMEA documentation is there a way to certify a battery pack against standards such as IEC 60335 and UL2595? To be able to certify the pack, I would need to do a FMEA analysis of the functional safety subsystem involving say the AFE and FET switches. How do I achieve this without the FMEA documentation of the AFE IC?

  • +1 in reply to Dattatreya Roy
    TI__Mastermind 38570 points

    Hello Dattatreya,

    Dattatreya Roy said:
    Doesn't BQ77PL900 also have a similar FMEA documentation available? 

    It does not, unfortunately.

    Dattatreya Roy said:
    Also if an AFE IC does not have a FMEA documentation is there a way to certify a battery pack against standards such as IEC 60335 and UL2595? To be able to certify the pack, I would need to do a FMEA analysis of the functional safety subsystem involving say the AFE and FET switches. How do I achieve this without the FMEA documentation of the AFE IC?

    Most of these standards are system-level standards that depends on the overall system, you may have to contact them to understand what is needed from the system to pass the certification. For IC-level FMEA, you may have to conduct your own analysis of the device to be able to pass these standards, or have it contracted out. Most of our customers are able to get our devices certified in their particular standards with no problems.

    In the case of the BQ76952, it will have safety documentation that should be able to aid you in passing the standards that you need. If an NDA is in place, you can request access and it will be granted from our side to download any FMEA/safety documentation.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 40 points

    Hello Luis,

    Okay got it.

    For our certification, we are primarily concerned with the safety critical part i.e. FET control. An FMEA analysis of the FET control part in BQ77PL900 IC should be possible with minimum effort as it is completely analog (unlike BQ769x0 series, where the FET control is done digitally). Does the BQ77PL900 IC have a pin equivalent diagram document, where the blocks such as undervoltage/overvoltage etc. are described more discretely? This would make the FMEA analysis even simpler.

    BQ77PL900 Schematic -

    BQ76930 Schematic -

  • 0 in reply to Dattatreya Roy
    TI__Mastermind 38570 points

    Hello Dattatreya,

    The FET driver itself is an analog component. For pin equivalent diagrams, we have the following document:

    We also have a document that explains in more detail how the FET driver works:

    I think these may be useful.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    TI__Mastermind 38570 points

    Dattatreya,

    One more additional question, out of curiosity, what MCU are you planning in using for your system?

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 40 points

    okay great, thanks.

  • 0 in reply to Luis H. S.
    Prodigy 40 points

    We are currently using MCUs from ST Microelectronics and NXP semiconductors.