Here's the files for a little A3979 breakout. It is compatible with RAMPS and similar electronics. Most components are 0402 (little stuff). Data sheet for the A3979 is at http://www.allegromicro.com/en/Products/Part_Numbers/3979/3979.pdf
Turn the trimpot CCW (from right to left) to increase current limit for motor.
L L Full Step H L Half Step L H Quarter Step H H Sixteenth Step
Eagle files -File:A3979breakout.zip