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L293 is the most widely known dual motor HBridge drive IC in Robotics.It can drive bipolar motors as well as Stepper motors.
L293 can drive two motors at a time with source 600mA current for each motor.The L293 comes in a standard 16-pin, dual-in line integrated circuit package. There is an L293 and an L293D part number. "D" version  has built in fly back diodes to minimize inductive voltage spikes
The L293 has an automatic thermal shutdown which means the chip will stop working if it gets too hot.If the L293 is getting too hot you can get another L293 and solder it piggy back on top of the first. This will double the drive current.
For current requirements of 2A you can use L298 & for still higher currents opt for MOSFET driven H Bridges.

L293D Motor Driver


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