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BQ76PL455A-Q1: Minimum Cell

Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ76PL455A, BQ79606A-Q1

Hi,

It is described that "Monitors and Balances 6-to-16 Cells per Device" on the page1 of the datasheet.

Is this minimum cell number(6) caused by the supply voltage(VTOP) 12V?

Best Regards,

Kuramochi

  • Hi Kuramochi,

    Yes the supply voltage is the driver of minimum cell count. If the supply voltage dropped below 12V you would lose the functionality of the battery monitor. I don't know what tests or real-world scenarios your battery pack might be exposed to, but if there was a chance that your supply voltage could drop below 12V I would not recommend using the BQ76PL455A. It would be much better to use a 6 channel device like the BQ79606A-Q1. It can support supply voltages as low as 5.5V while retaining full device functionality.

    Thanks,

    Geoff

  • Geoff-san,

    Thank you for your help.

    I have an additional question.

    If the minimum cell voltage is 3.2V, are 4(=4*3.2V=12.8V) cells allowed?

    Bets Regards,

    Kuramochi

  • Hi Kuramochi-san,

    If the BATT voltage remains above 12V then the part will remain functional. Please ensure that you are considering things like transients and potential dips on the BATT voltage. 

    Thanks,

    Geoff