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Low current CAN Transceiver recommendation

Chalice_Liu
Intellectual 300 points
Other Parts Discussed in Thread: BQ76952, TCAN1051

Hi, TI experts

I have a question about bq76952.REG2 LDO

The BQ76952 datasheet shows an example application where the REG2 LDO output is supplying 5V power to a CAN transceiver. However, the LDO output current limit of 45mA is too low to meet the supply current requirements of TI's TCAN1042 or TCAN1051 transceivers (80mA max in dominant mode, up to 180mA with the bus faulted).

Is there a recommended CAN transceiver which will not overload the REG2 output of the BQ76952? 

Waitting for your comments.

  • 0
    TI__Guru 74292 points

    Chalice,

    Unfortunately, there aren't any in our portfolio that have lower current consumption in dominant mode. This is due to the nature of the current consumption, since the bulk of it comes from the voltage drop over the termination resistance on the CAN bus.

    One thing to point out is the dominant current seen in the datasheet isn't a constant, and average current consumption of a standard CAN bus is probably closer to 30mA while it is active (this is dependent on how long the bus is in dominant vs. recessive state). So the BQ76952 would likely be able to support a CAN transceiver even with the current limit, though a fault condition will cause issues. But in that case, there are other issues than the transceiver supply not having enough current output.

    Regards,

    Eric Hackett