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Original question:

BQ7718: Battery protector for LFP

BQ7718: Replacement protector for Lithium Titanium Cells

Needhu Gunasegaran
Intellectual 2890 points
Part Number: BQ7718
Other Parts Discussed in Thread: BQ40Z80, , BQ77915

Hello Team,

One of my customer had the following question.

we would like to use the BQ40Z80 also for lithium titanate cells, therefor we need a battery protector similar to BQ7718 with 2.9V cut off, does TI has something like that?

Two questions from my side.

  • Is BQ77915 the best Protector replacement? (that's what i proposed him, BQ7791500 to be precise)
  • Would the BQ40Z80 work here? (Stupid question probably but, do we need special FW for different Cell chemistry?)

Thanks and Best Regards,

Needhu

  • 0
    TI__Guru* 81034 points

    Hi Needhu,

    The BQ77915 is factory programmed and available versions only have OV down to 3800mV. If a new part number was created, the lowest OV voltage possible to program is 3000mV. So I do not think this would work for this application.

    The BQ40Z80 might work here. The protection thresholds are programmable and could be configured for this battery type. It also has secondary protection features, so some users use it as the primary and secondary protector (although some users like to have a separate device). Since this might be the only option for this application, I suggest creating a new E2E question on the BQ40Z80 - this way it will be assigned to a gauge expert that can answer all of the questions about this device.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    TI__Intellectual 2890 points

    Hi Matt,

    Thanks for the feedback.

    Best Regards,

    Needhu