I’m pretty new to electronics and have a basic question I could use some help with.
I’m powering a small Arduino project using batteries that range from 6 to 7.2 volts. Specifically I am delivering power to a Lolin D1 Mini through its 5 volt Vin pin. So I am looking at Pololu’s step-down regulators to make sure I don’t deliver too many volts when my batteries are freshly charged.
My concern is that when I program the D1 Mini via USB, the Vin pin gets powered, which means the regulator will have a positive voltage on its Vout pin. The regulator’s GND pin will be connected to the D1 Mini’s, but the regulator’s Vin pin will not be connected to anything because I won’t be using USB and the batteries at the same time. So I think essentially a circuit will be created with positive voltage applied to the regulator’s Vout and passing through to GND.
Is this something that could damage a D24V10F5? What about one like D24V22F5 that advertises reverse voltage protection?
Happy to provide any more information that may be useful…thank you!