When the battery voltage is 12V and EN is 0V, VDD voltage is a little floating.
The feedback voltage is formed at a specific value and since VDD=0 (EN=0V), voltage seems to reverse and current flows through the body diode of mosfet.
(This is my guess.)
As I guess, is it correct that VDD voltage goes up because current flows from feedback node to VDD?
If so, what do you think of this leakage current?
Please reply.
Thank you.