Three-phase motor controller is sensorless

ON SEMICONDUCTOR LV8907UW motor controllers support an operating voltage range from 5.5 to 20 volts (4.5 to 40V transient), enabling streamlined solutions for driving three-phase brushless motors. Device integrates gate drivers for six N-channel MOSFETs and a dual-stage charge pump for 100% duty-cycle operation. In its lowest cost configuration the IC can operate without an external microcontroller. Device requires no programming, as key parameters and functions, such as startup and speed setting; can be configured via SPI interface and stored in embedded non-volatile (OTP) memory. Open-loop and closed-loop speed control are possible. http://www.onsemi.com