This is a breakout board for the Skyworks AAT1275-3.3 chip, which is an inexpensive ($0.49 on Digikey) 3.3V boost converter that can boost a voltage as low as 0.5v up to 3.3v. The breakout board is designed to plug easily into a 2.54mm pitch breadboard.

Here is the datasheet: http://www.skyworksinc.com/uploads/documents/AAT1217_202050B.pdf

Here is the part on DigiKey: https://www.digikey.com/product-detail/en/skyworks-solutions-inc/AAT1217ICA-3.3-T1/863-1496-1-ND/4246188