The motor driver chip is spec'd to deliver up to 1A per output.  It has thermal shutdown, but it's probably not a good idea to depend on this.

The specs on the driver chip are available here:  http://focus.ti.com/docs/prod/folders/print/sn754410.html

RidgeSoft Support

--- In intellibrain@yahoogroups.com, Doug Franklin <DRFranklin@...> wrote:
>
> I'm looking at using my Intellibrain & Expansion board with a small
> two-motor tracked robot kit. Each motor is rated at 7.2V, 300 mA no load,
> 2.0 A stall. The specs I see for the expansion board are 4x motor
> controllers, 1A each. So if I used one per motor, and stalled the robot,
> these guys would be overdrawn...
>
> So I have two questions. One, is there any kind of protection on the
> controllers so they won't fry in this situation?
>
> And two, would it be possible to wire a couple of the motor controllers in
> parallel for each motor, thereby boosting the max amperage to 2A per pair?
> (This seems very unlikely... the pwm driving the motors would have to be
> exactly in phase for each pair... but, no harm in asking!)
>
> Thanks in advance,
>
> Doug Franklin
>