I'm trying to control a large motor with an Arduino Micro. From the power supply, current goes through a power switch and a diode before reaching a branch. The two branches lead to: (1) An appropriately rated motor driver breakout (11.8 V, as much as 5 A). (2) A voltage regulator to drop down to 5 V before going into the Arduino's Vin pin (maximum 1 A).
Theoretically, I wouldn't expect the high current draw across the motor to overload the voltage regulator, since they're in parallel. But is there any chance that it might? I ask because I've had a few voltage regulators work just fine for a little bit, and then start acting very strangely: (1) Vin and GND somehow got internally shorted, which caused a series of VERY BAD THINGS. (2) Vout produces 0 V. (3) When I tried just feeding the Arduino 11.8 V, hoping that its built-in regulator would handle it, the 5V pin started outputting around 8.5 V.
I'd like to sort this out before I destroy any more regulators.