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TPS543B20: PGD and EN relationship

Kevin Wen
Intellectual 2235 points
Part Number: TPS543B20

Hi Team,

My customer is designing a circuit with multiple TPS543B20/C20, they are using EN and PGD pin to achieve power-on sequence and start the device one by one during start up (Device A->B->C->D, PGD connect to next device's EN).

Now, they got a requriement for power off sequence that they need to shutdown the device one by one in a opposite way(Device D->C->B->A).

So we need your help to understand how PGD would work if EN is disable the device, will PGD still follow the status of output voltage? or will PGD be high-impedance when EN is disabling the device? thanks. 

BTW, do you have any suggestion about how to achieve the power-off sequence? thanks. 

Kevin