Output voltage of boost converter is adjustable and can be set from 2.0v to 5.5v, as per datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22234B.pdf
Minimum operating voltage is 0.35v, and minimum start-up voltage is 0.65v.
The MCP1640 part can be found on DigiKey here: http://www.digikey.com/product-detail/en/microchip-technology/MCP1640T-I-CHY/MCP1640T-I-CHYCT-ND/2258621
This board is designed to plug easily into a 2.54mm pitch breadboard. Use 2.54mm pitch header pins.
Acknowledgement: Use of the MCP1640 chip was suggested by Scalz here: https://forum.mysensors.org/topic/5294/3-3v-boost-converter Thank you for the suggestion!