AMT49406 Code-Free FOC Sensorless BLDC Motor Controller

Allegro MicroSystems' AMT49406 is a three-phase, sensorless, BLDC motor driver (gate driver) that can operate from 5.5 V to 50 V.

A field-oriented control (FOC) algorithm is fully integrated to achieve the best efficiency and acoustic noise performance. The device optimizes the motor startup performance in a stationary condition, a windmill condition, and even in a reverse windmill condition.

Motor speed is controlled through analog, PWM, or CLOCK input. Closed-loop speed control is optional and RPM-to-clock frequency ratio is programmable.

A simple I²C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles.

The AMT49406 is available in a 24-contact 4 mm × 4 mm QFN with an exposed thermal pad (suffix ES) and a 24-lead TSSOP with an exposed thermal pad (suffix LP). These packages are lead (Pb) free with 100% matte-tin leadframe plating.