Allegro MicroSystems, Inc. Introduces New Automotive, Sensorless BLDC Controller

With Extensive Diagnostics and Protection Features

December 6, 2011

A4960 Sensorless BLDC Motor Driver

Worcester, MA – Allegro introduces a new three-phase, sensorless, brushless DC (BLDC) motor controller for use with external N-channel power MOSFETs that is designed for various pump, blower and cooling fan automotive applications.  The motor is driven using block commutation (trapezoidal drive) where phase commutation is determined, without the need for independent position sensors, by monitoring the motor back-emf.  A programmable mo­tor start-up scheme allows the Allegro A4960 to be adjusted for a wide range of motor and load combinations.

External bootstrap capacitors are  used to provide the above battery supply voltage required to drive the  N-channel MOSFETs. An automatic internal bootstrap charge management scheme ensures that the bootstrap capacitor is always sufficiently charged for safe operation of the power MOSFETs. The power MOSFETs are protected from shoot-through by integrated crossover control and adjustable dead time.

Integrated diagnostics provide indication of undervoltage, overtemperature and power bridge faults and can be configured to protect the power FETs under most short circuit conditions. Detailed diagnostics are available as a serial data word or through a programmable diagnostic output. The A4960 is supplied in a 32 lead eLQFP (suffix JP).  This package is available in lead (Pb) free versions, with 100% matte-tin lead frame plating (-T). 

Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at

Editorial Contact:

Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363

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