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BQ76942: Current for cell balancing

Evan FERREIRA
Prodigy 50 points
Part Number: BQ76942

Hello,

I am contacting you because i would like to ask you some information about the BQ76942 IC (the new one).
I was wondering what was the meaning of the "Maximum cell balancing current
through a single cell : 100mA" wrote inside the datasheet (page 8). :

https://www.ti.com/lit/ds/symlink/bq76942.pdf?ts=1617008999875&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ76942


Also I would like to know if it was possible to simulate the circuit on ltspice fo exemple, is there any model that we can use ?
I'm currently trying to make a BMS and i would appreciate having some advice.

Thanks in advance for you answer.

  • 0
    TI__Guru* 81035 points

    Hi Evan,

    Theoretically, it should not be possible to exceed 100mA on a single cell because the internal cell balancing FET resistor is typically ~25 ohms. So if you use the minimum allowed cell input resistor values, the maximum balancing current through the internal balancing FET is around 65mA. 

    Some of these example calculations are shown in the Cell Balancing app report: https://www.ti.com/lit/an/sluaa81/sluaa81.pdf

    We do not have a model for simulations, but we do show example waveforms in the app report as well.

    Best regards,

    Matt