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Original question:

BQ76940: balancing with transistor

BQ76940: Protection for Overcurrent

Liu Yang
Expert 8695 points
Part Number: BQ76940
Other Parts Discussed in Thread: BQ78350-R1A, BQ76952

Hi team,

Bq76940 chip has Hardware protection for Overcurrent in Discharge (OCD) and Short Circuit in Discharge (SCD).
Why is there no protection for Overcurrent in charge?
If the charging current is too large, does it need to be protected?

Beat Regards,
Tom Liu

  • 0
    TI__Guru* 81034 points

    Hi Tom,

    Good question. The BQ76940 includes multiple protection features implemented in hardware for fast response time (for example, SCD and OCD). If you look at the BQ78350-R1A companion controller (some users use this instead of an MCU because it also includes gauging), it has many additional protections implemented like over-current in charge. However, the delay time for OCC is programmable in seconds (see section 3.4 of the BQ78350-R1A Technical Reference Manual: https://www.ti.com/lit/pdf/sluuc78 ). You can implement this same feature on your MCU.

    There is a newer 16S battery monitor, the BQ76952 that is available for samples and includes several more protection features. This might be a good option for future projects: https://www.ti.com/product/BQ76952

    Best regards,

    Matt