No, in order to be able to use USB and MIDI while charging the iPad, you’ll need a dedicated audio interface, like these:
http://store.griffintechnology.com/studioconnect-hd
http://www.alesis.com/iodock
http://www.behringer.com/EN/Products/iS202.aspx
Keep in mind that the specs change, and some of these don’t support SYSEX, so it might be a bit hit and miss.
I always use my iPad with Cubasis on battery power, it lasts for hours and hours.
It could be a problem if I was doing 8+ hours sessions though.