I have a partly-baked idea I'm exploring, for a simple laser beam diagnostic tool. It needs a small brushless motor (less than 10 mm diameter and 3 mm tall) with an ironless rotor. I have possible motors in mind, but it seems that there are few integrated BLDC controller/driver chips these days. I was going to use an Allegro A8904, but it's now listed as "not recommended for new designs". :(
I'd prefer to use a back-EMF controller rather than Hall sensors, because I don't care too much about smoothness of motion during spin-up, and sensorless motors are cheaper, particularly in such small sizes.
Any recommendations for integrated BLDC controller/driver chips?
Thanks
Phil Hobbs