This isn't terribly Arduino-related, but I figured this is the right community to ask. What's the smallest DC-DC converter I can get that takes 5V or USB plug in and ~19-20V output? I looked at the XL6009 but looking for something smaller if possible.
(I hate chargers that aren't USB. I want to hack my electric shaver to use USB charging so I don't have to carry a separate charger for it around anymore.)