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BQ76PL455A-Q1: less then 6-cell battery monitoring

Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ76PL455A, BQ79606A-Q1, BQ76PL536A-Q1

Hello Support Team,

If minimum supply voltage of PL455A is 12V, so it IS possible (theoretically) to use in on 5-cell Li-Ion battery pack. According to: 12v / 5cell = 2.4V/cell, it is inside the Li-Ion cell voltage range.

Can you verify or reject this idea?

Thanks

Regards

  • Hi Sergey,

    While this might theoretically be possible, 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.

    Best Regards,

  • Hi Kristin,

    Thanks for your fast reply. I totally understand what you're saying, sure dedicated device is better but I just have a ready modules of PL455 which I want to use on this not high volume project. So, what I wanted to be sure is that the functionality of the device is the same and not affected even with 5-cell battery, when supply voltage above 12V. I can ensure it will stay within the range.

    BTW, you suggested BQ79606A-Q1, why not BQ76PL536A-Q1, it looks like "small brother" of PL455?

    Thank you,

    Regards

    Sergey

  • Hi Sergey,

    The BQ79606A-Q1 is a newer device than both the BQ76PL536A-Q1 and the BQ76PL455A. We've made some significant improvements in the BQ79606A.

    Best Regards,