I want to control a 1.5V motor using a microcontroller output. The motor draws about 450mA stall current. I am considering to use a Darlington transistor such as TIP120 to bridge the microcontroller output and the motor. However, the Darlington transistor will introduce a rather high collector-emiter saturation voltage of about 0.6V at Ic=400mA. This will mean the motor will be operated at about (1.5V-0.6V)=0.9V only. Will the motor spin with 0.9V only? And even if it spins, will it produce significantly lower torque?
If using a Darlington transistor is not the way to go, what are my other choices?
Due to space constraint, I still prefer to have the motor powered using one 1.5V battery only. So, adding another 1.5V battery may not be preferred in my case.