I have no idea what the boost converter is. There are no markings on the board. It's this one http://www.ebay.co.uk/itm/3V-to-5V-1A-DC-DC-Converter-Step-Up-Boost-Module-NEW-/221944769808?hash=item33acf06d10:g:gjoAAOSwI-BWOsqa
Sorry about my poor paint skills. I'm graphically retarded.
