1. VIN pin
The internal circuit of EN pin, pull-down or pull-up, is not seen in the datasheet.
The external resister should be added if necessary ?
2. Diode from VREF to VIN
What happens when the input voltage is off (0V) after VREF goes up to 3V ?
Is a diode that VREF charge flows back to VIN necessary?
I will appreciate if anyone will answer.
Regards,
M. Ogawa