I want to power my DUE on a LIPO 3.7 V (4.2 V max) battery
using a 3.3V LDO regulator.
I do not need any of the 5V supply on my DUE setting.
Is there any problem to connect directly the regulated 3.3V supply to the 3.3V pin of the DUE ?
I have tried.
It works for a few seconds and then stops.
Hopefully I did not fried the DUE.
But I had to upload the software again to make it work.
Anybody has some explanation ?
Applying any voltage higher than 3.3V can damage the board. You must use a 3.3V regulator in conjunction with the battery pack. And although it is possible to do this, it is not recommended. In many cases you may be better off using a buck regulator to Boost the voltage up to 5V. and set the minimum battery pack voltage "cutoff voltage" to 0.8V per cell. This can extend the battery life by several times. you can connect directly to the 5V out pin.