The MCP1253 has only 3 caps required to make a selectable 3.3V or 5V step up and step down power supply.
Inductorless, Buck/Boost, DC/DC Converter
120mA output current
Input volts from 2.0V to 5.0V
uses MSOP so a bit tricky for me and BatchPCB but I can see a very versatile BOB