TPS7A7300: EN & PG leakage during power-down

Hey Steve,

What do you mean by leakage current back into the TPS7A7300? Are you asking about the quiescent current?

Assuming the PG is connected to a Pull-Up resistor, the leakage current of the PG pin will be dependent on the pull-up resistor. 

Please let me know so I can better answer your question.

Best,

Juliette

Juliette,

This one is not about quiescent current

The condition is that Vin is zero and the device is not powered. The PG is connected to another system that is powered - perhaps through a 10kohm pull-up to 3.3V. Now, is there any leakage current that could flow back through the PG pin and then out any other pin (such as Vin) so as to back-power the system on the TPS7A7300 side?

For open-drain devices, this is typically not the case & especially if the ESD structures don't involve a pn junction to Vin.

I think this is the case for the TPS7A7300 since the ABS max tables don't indicate a dependence on VIn for PG.

We need to be sure about this - an estimation of any leakage magnitude (nA? uA?) is needed.

Please advise.