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BQ77216: Stackable with BQ79718

Beginner
Intellectual 2411 points
Part Number: BQ77216
Other Parts Discussed in Thread: BQ79718-Q1, BQ7718, BQ79616

Tool/software:

As you know, BQ79718 is 18S but BQ77216 is 16S.

Please let me know we need to align cell connection. For example, if there is 54S solution with cell order (1S to 54S)

For bq77216 in bottom group. 1~16S, 17S~32S, 33~54s. Should we change BQ79718 pin count from 18S to 16s to meet layout limited?

  • 0
    TI__Intellectual 2411 points

    In the other words

    - BQ79718-1st GND connected to BQ77216-1st GND 

    - BQ79718-1st 17S connected to BQ77216-2st GND 

    Any risks for this kind of design?  

  • 0 in reply to Beginner
    TI__Intellectual 2411 points

    Any comments?

  • 0 in reply to Beginner
    TI__Expert 5645 points

    Hi Beginner, 

    Thank you for your patience. It'll be good if you can do a diagram of what you are trying to achieve. 

    For my understanding, you want to stack BQ77216 to a higher voltage (54s). You have 3x sets of BQ79718-Q1, and you want to split the BQ77216 for 4x pieces, but not sure how to map the channels. Please feel free to confirm if my understanding is incorrect. 

    Overall, you can stack the protector, but you will need some level shifting circuits on your PCB/layout, and keep mind of your chip ground and he absolute maximum voltages of each IC. 

    You can do it in a similar fashion to this BQ7718 TIDesign https://www.ti.com/tool/TIDA-00108, which walks to some of the consideration for stacking battery protectors.

    To make things easier and reduce the number of ICs, you might need to use 16s of the BQ79718 per BQ77216. You can also look into the BQ79616 (16-s) as an alternative for monitor; OR you can consider stacking 4x BQ7718 instead per BQ79718.

    Regards, 

    Arelis G. Guerrero