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LMQ61460-Q1: An inquiry for absolute max. spec

Lee, Sam
Expert 5515 points
Part Number: LMQ61460-Q1

Hello team,

 

The datasheet of LMQ61460-Q1 specifies the absolute maximum spec of Min=0V for PGOOD pin. It’s not allowed to get any negative voltage, unlike other pins (Min= - 0.3V). Also, the PGOOD can be grounded if not used.

A customer asks about this. The Min=0V means that it’s not allowed even for a bit negative voltage. In that case, if PGOOD is tied to GND, is there a possibility that any negative voltage will be applied with respect to GND? Otherwise, there will be no potential difference between PGOOD and AGND/PGND? Could you provide your opinion?

 

Thanks,

Sam Lee

  • +1
    TI__Guru 50120 points

    Hi Sam,

    If PGOOD is tied to GND then it will always be 0V. Given that AGND and PGND are tied together at a point on the PCB, this makes AGND and PGND relatively close potential to each other. 

    So in this case if PGOOD feature is unused, please tie it to GND. If PGOOD feature is desired, tie it to an appropriate voltage rail that is no more than 20V.

    Regards,

    Jimmy