My customer reports the following on the LTM4622.
When VIN is within the recommended operating range and RUN is turned low, the PGOOD2 pin is pulled low (about 200n seconds after RUN is turned low) before the VOUT voltage drops to -8%.
They claim to have confirmed this phenomenon for all the boards they designed.
My understanding is that the PGOOD indicator depends only on the output voltage and not on the RUN signal,
and this was also confirmed by simulation using LTspice.
Now I am working remotely (due to COVID19) so I can't experiment with the demo board to confirm this.
I would appreciate it if you could tell me the correct behavior of the LTM4622 PGOOD pin.