I have a 5v board with FM radio and am planning to use 3.7v LiPo or 2x 3.7v LiPo. What woud be the best way to power it, 2 x 3.7 in series plus stepdown or linear converter (because dont want any RF interference) or 1x or 2x3.7 in parallel and booster? Maybe there are other options? The max power is is to drive 2x 50ohm headphones. Thanks.
PS. idealy i'd like to be able to charge it conviniently too
Audio = linear regulator.
Just perhaps if we had the documentation of this "5v board with FM radio", we could answer.
If it is already digital, fussing about using a linear or switchmode regulator may not be so relevant. 
3x lipo in series with a simple 7805. Using just two probably will teeter on the brink of the 7805's lower input limit. I'm not sure if a low dropout regulator can be used here...
Im currenly testing polulu stepup converter U1V11F5, as you can see from the picture. I havent noticed any RF interference yet
If its working as per expectation then go ahead with it. If its hi-end (audiophool) performance you're looking for then any kind of switching supply has to have very tight noise control else it can get into the audio.
All said, linear supplies are inherently low noise and simpler to construct out of discrete parts, only downside is that linear supplies are bulky due to the power transformer which is the heaviest and largest part.
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