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BQ28Z610: Undervoltage protection

Part Number: BQ28Z610
Other Parts Discussed in Thread: BQ4050, BQ40Z50

We are evaluating two batteries for use in a medical device, where one uses the BQ28Z610 and the other uses the BQ4050. We have noticed that the BQ4050 provides a "Permanent Fail" mode for undervoltage (configurable threshold, defaulting to 2.2 V), but that the BQ28Z610 "Permanent Fail" mode does not include support for undervoltage. Is there something about the design of the BQ28Z610 which negates the need for an undervoltage "Permanent Fail" state (e.g., charge monitoring that will catch a failure before it is catastrophic), or should we be concerned with using the BQ28Z610 because it will not prevent recharging after a deep discharge? Thanks in advance.

  • Hello Travis,

    The bq4050 has a lot of PF modes, and the bq28Z610 has only a few. It just depends on what the priorities were when we designed the FW. The bq28Z610 does have a non-PF undervoltage protection, which should ideally prevent any over discharge. Of course it doesn't have the extra PF protection like you pointed out. If you want an impedance track gauge that has the PF for undervoltage, we do have the BQ40Z50 series.

    Let me know if you have any more questions.

    thanks,

    Alex M.