Today i have tested a motor drivers RDV8833 buyed from some chinese store online. There was an error in the documentation: EEP pin have to be connected to 5v (http://www.ti.com/lit/ds/symlink/drv8833.pdf). This took me 1h hour to find, but i'm pretty happy cause my little N20 motors are working (for another project).
I'm thinking about replace the inefficient l298n. but damn, this thing is so small... i waisted 20 min to solder pins .. :=)
i've already replaced the LM2596 DC-DC convertor with a smaller one. :