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I am using the LT8610ABHMSE#PBF in a project, and I am trying to determine the impedance to GND when looking back into the output of the regulator when there is no voltage applied to the input of the regulator. I am concerned my on-board 3.3V coin cell battery is being discharged back through this regulator when main power is removed, but was not sure how to measure this impedance or if it was spec’d already. Please let me know if you would like anymore clarification and thank you for your help.
The condition I understand to be in question is one where the input (what about enable…?) pin is open and a potential is present at the output due to a voltage source being connected to it.
This is not a typical operating condition for a device of the type, so I would not expect to see it characterized in such terms. By the same token, devices that do account for such an operating mode tend to mention it in the datasheet since it’s uncommon.
That said, the block diagram on P.11 of the datasheet shows a diode that’d become forward-biased under the conditions in question, and one may expect the FET itself to behave as such.
Exact behaviors are likely to depend on what a person does with the enable pin and a few other things, but a fair guess it that the chip will at least consume something in uA territory when inactive based on the quiescent current figures. Potentially much more if the part starts coughing and sputtering in an attempt to run 'cuz it’s seeing charge accumulate on the input filter caps and a person had the enable line hotwired.
