Maximum forward voltage drop per bridge element at 4.0A dc
Since only two elements will be on at a time, the drop across the regulator is 1.1 on each side, so a total of 2.2. A little less than that at 3A.

Output current is dictated by the rest of the circuit.

As for the specs.. Watch your power. That device may get rather too hot at 3A with no heat sink. I believe Max current shown will be for a heat-sinked installation. 150C is way too hot.....