Arduino pro mini v5 on-board MIC5205 150mA LDO Regulator

I also intend to power through the VCC pin bypassing the linear voltage regulator.
So Ill have the LiPo battery connected to an external switching voltage regulator connected to the VCC pin. The external voltage regulator I have been referring to will discharge a battery to 2.7V which is smaller than the limit of >3V LiPo cell discharge. Perhaps I am misunderstanding something.