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Original question:

BQ76200: DSG FETs die while doing SC test when using bq76200 , bq76930 and bq78350 in Battery Management System

BQ76200: BQ76200 drive 110A current problem

Jimmy Huang22
Expert 1470 points
Part Number: BQ76200
Other Parts Discussed in Thread: BQ76952

We want to use BQ76200 as a high-end driver with the same port and the maximum continuous current of 110A.

22 MOSFET (VDS60V) need to be driven. Can a BQ76200 be driven?

If one BQ76200 can't drive, can we use two BQ76200 to drive?

One drive of BQ76200 drives charging MOS, and the other drives discharging MOS?

  • 0
    TI__Guru* 80963 points

    Hi Jimmy,

    Using 2 BQ76200 devices can help with the load on the charge pump as described in this document (https://www.ti.com/lit/an/slva729a/slva729a.pdf), but the internal resistance of the driver will still result in slower FET switching times as the number of FETs increases as shown in the document.

    Another option is the BQ76952 battery monitor which drives high-side FETs. Test results driving higher number of FETs are shown in this document: https://www.ti.com/lit/an/sluaa09/sluaa09.pdf  The switching times might be better for this device. It does not have the UVLO feature and it is only rated to 85V (vs. 100V for the BQ76200).

    Best regards,

    Matt