I need to convert +5V to +12V with minimal components and PCB space
It depends what you want to do in the general case (and the op-amp...) but:

http://www.micrel.com/_PDF/mic2141.pdf

http://www.ti.com/lit/ds/symlink/tps61170.pdf

Generally-speaking, for what I believe you're looking for the parts rarely integrate the inductor, but it's only 2x2 mm and a SMT inductor plus 2 caps in many cases, so still a smaller footprint than what you're currently using. With more searching you may find a lower-current part.

I would imagine you also have noise requirements? Is this a reference or a supply?