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TPS53659: Can VR_RDY VR_FAULT SMB_CLK SMB_DIO SMB_ALERT be pulled up to external 3V3?

Kelly Bai
Intellectual 1330 points
Part Number: TPS53659


hi team,

can we use external 3V3 rail but not V3P3 to pull up open drain output of VR_RDY VR_FAULT SMB_CLK SMB_DIO SMB_ALERT? if it's OK, does there any considerations we need to pay attention to?

thanks.

  • 0
    TI__Expert 8960 points

    Hello Kelly,

    If I understand your question correctly, you want to use two different 3.3V rails. One would be powering the controller (on the 3P3V pin) & another would be used to pull up the pins you mentioned.

    While I'm not certain why you would want to do this, the controller shouldn't care as long as both supplies are reasonably well regulated and have bypass caps to ground.

    Thanks,

    Travis