LTM2987 PWRGD Output not pulling low when LTPowerPlay indicates power is good.

Power Good is active high, so NOT LOW means power is good. In the LTC2977 datasheet the bit is named "Mfr_pads_pwrgd_drive." I see in LTPP it is named PWRGDB_DRIVE, as if the "B" means active low, but it is not active low.

I'm not sure what you are trying to communicate. Are you saying that the PWRGD signal is behaving as expected? This doesn't make any sense to me. Shouldn't the Open Drain output be pulling the PWRGD output pin net low?

I am saying it is behaving as expected. Even though it is open drain, it is active high. I have confirmed with the team that the B in the bit name should be removed.

It is active high open drain so that multiple parts can connect to the same power good net and all parts have to release the net for the whole system to be in the power good state. Any one part without power good brings the net low to indicate the power is not good. Basically, a wired OR function.

Thank you very much, I understand now.

Thank you very much, I understand now.