I have a custom Arduino that is poweredby a LiPo battery going through a buck/boost converter to give a constant 5 volts. The 5 volts powers some sensors while the arduino and tranceiver module run on 3.3 volts.
Being mindful of efficiency to conserve battery power; to step down from the 5v to the 3.3v should I use a linear or switched mode regulator? I read somewhere that at low voltage differences, a linear regulator can be more efficient that switched mode. (The arduino and transceiver pull 30-60ma.)