We feed DC 5V into VCC_EXT_5V and then it outputs 3.3V to the 3V3 in the normal condition. The following is a part of the power circuit.
My question is followed:
How does it work if I connect the other 3.3V power source to the 3V3 leaving the VCC_EXT_5V open?
As far as I know, the internal circuit may be broken if Vout is higher than Vin. But the manual says there is some protection circuit.
How do you think about it?