Allegro MicroSystems, LLC, a leader in developing, manufacturing and marketing high-performance semiconductors, has announced the release of a three-phase, sensorless, brushless DC (BLDC) motor controller for use with external N-channel power MOSFETs.
Allegro’s A4964 is specifically designed for the automotive market with target applications to include engine cooling fans and oil and water pumps. It provides the motor control functions in a system where a small microcontroller provides the communication 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. It can also operate as an independent single chip remote motor controller.
The A4964 offers three control modes, open loop (voltage) control, current (torque limit) control and closed-loop speed control, which allows it to be used in a wide range of applications. It is provided in both a 36-terminal QFN and a 32-lead QFP package, both with exposed thermal pad for enhanced power dissipation.