Thanks, I would like to know the expectations.

You rock.

OEM modules use 1.8v flash and ram. not sure if they are powered by discrete ldo or esp32 onboard ldo and whether the pin is intended as alternate supply or output.

@lebucur The Lopy warms up a little bit when running. Can you estimate how worm it get's. It's normal that it gets a little bit warmer than environmental temperature, so it feels warm, but you should still be able to touch it without without any pain. Is it the deviec in total or a specific component?

@Officina I just tried running the device with 3.3 V on Vin, and it works. At the moment, the DC in is at 2.95 V, and still running. According to the data sheet of the regulator, it goes into a bypass mode if the input voltage is too low, and that's what I wanted to confirm. So it looks as if is more safe to run with a low Voltage on Vin.

@MarcusKirsch I found the 5V pin (doh!) all good all running.