I've worked with a few motor drivers but I've never worked with a Toshiba TB6612.
I now have a requirement for a small DC brushed motor H-bridge, requiring 1.4A peak current. By 'small' I mean it must fit between the pins of an Arduino Pro Mini. Surface-mount is preferred as I will be getting a PCB from OSHPark. The TB6612 seems to fit my requirement. It has dual outputs, each of which is capable of driving my load, according to the datasheet. Since I only need to drive one motor, I was thinking of tying the A and B inputs and outputs together, just to spread the heating out across the whole chip.
Can you think of any reason why it might be a bad idea to parallel the outputs like this? The datasheet doesn't have much to say on the topic. It does helpfully tell you not to plug it in incorrectly. :)