Hi, The ESP32-LyraT EVB uses a LD1117S33CTR LDO to provide the 3.3V (VDD33) supply. This LDO input is driven either by the USB interface or by the LIPO battery. The LDO dropout voltage is about 1V-1.3V, which means minimum LDO input should be about 4.3V-4.6V. However, to the best of my understandin...