I tried to run a stepper motor with my raspberry Pi 3+, it all worked well in the beginning but then I fried the chip. I am using a 12V 5A power supply and my stepper has a rated current of 2Amps and coil resistance of 1.1Ohm. I contacted the support of Adafruit and they recommended Pololu. But now I am puzzled on which stepper motor driver is suitable. I am very new in electronics and thus not quite familiar with what to bear in mind when choosing such components.