LMR mr basic motor controller question

Hi, just wanted to ask if any have used this motor controller with any kind of micro controller?

https://www.robotshop.com/letsmakerobots/node/10302?s=l

Just wanted to know how much Amp the motors draw when you start up, can it be used with only 3 AA batteries, or do you need a ekstra powersupply for your main circuit?