A4964 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - Three-phase sensorless BLDC motor control FET driver - Three-phase sinusoidal drive with soft start - Sensorless start-up and mutation - Windmill detection and synchronization - Bootstrap gate drive for N-channel MOSFET bridge - 5.5 to 50 V supply range - SPI-patible interface - Programmable control modes: speed, voltage, current - Peak current limiting - Control via SPI or PWM - Programmable gate drive for slew rate control - LIN / PWM physical interface with wake - Logic supply regulator with current limit - MCU watchdog and reset - Ignition switch interface - Diagnostics, status, current, and speed feedback APPLICATIONS - Automotive fuel, oil, and urea pumps - Automotive fans and blowers PACKAGES 36-terminal e QFN (suffix EV) 32-lead e QFP (suffix JP) Not to scale DESCRIPTION The A4964 is a three-phase, sensorless, brushless DC (BLDC) motor controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications. It is designed to provide the motor control functions in a system where a small microcontroller provides the munication interface to a central ECU and intelligent fault and status handling. The A4964 provides the supply and watchdog for the microcontroller and the high-voltage interfaces between the microcontroller and the central ECU and ignition switch. The A4964 can also operate as an independent singlechip remote motor controller. The motor is driven using 3-phase sinusoidal current drive where phase mutation is determined, without the need for independent position sensors, by monitoring the motor back-EMF (bemf). The sensorless start-up scheme includes forward and reverse pre-rotation (windmill) detection and synchronization, and allows the A4964 to operate over a wide range of motor and load binations. The A4964 can operate with duty cycle (voltage) control, current (torque limit) control, and closed-loop speed control. Control mode, operating mode, and control parameters are...