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BQ76940: Are ferrite beads recommended for the cell interfaces - why/why not?

Lauren Mayfield
Expert 7895 points
Part Number: BQ76940

Hi team, 

My customer would like to know if we have any collateral/technical documentation on the discussion of ferrite beads in the cell interfaces for the battery monitors. They are advised in some datasheets, but are absent in some reference designs. 

Do we have any material giving support for the design including these, or discussions about the topic?

Note this question isn't specifically about the BQ76940, just our monitors in general.

Thanks,

Lauren

  • 0
    TI__Guru 54715 points

    Hi Lauren,

    Designers using the BQ76940 often are looking for a low cost system design and may have an easy system environment.   Other designers may want a very robust design or have high EMI field requirements and need a filter on each input to the board. 

    The BQ76940 has no specific considerations for beads on the inputs.  The beads have a low DC resistance and high impedance at high frequency, so they may be beneficial when used in designs with high field strengths. 

    Parts intended for use in high field strength environments are more likely to include beads as part of an EMI filter since it will be typical of the application for that part.