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High-Performance Power ICs and Hall-Effect Sensors
Allegro MicroSystems, Inc. Introduces Full-Bridge
Motor Driver, Providing Integration of Hall Element and Motor Control
Circuitry 
Worcester, MA, Oct. 11, 2005 — Allegro MicroSystems, Inc. announces the release of the A1441, a full-bridge motor driver designed to drive single-phase, low-voltage bipolar brushless DC motors. Commutation of the motor is achieved by the use of a single Hall element to detect the position of an alternating pole ring magnet. Allegro's advanced IC semiconductor process allows for the integration of the Hall element on the same IC as the motor control circuitry, providing a single-chip solution for high reliability.
All necessary circuitry is integrated and no external devices are required. A bypass capacitor is recommended to lower switching transients and therefore reduced radiated emissions. The switchpoints of the device are chopper-stabilized for precision over operating temperature and voltage.
An active braking function and sleep mode can be enabled by an external signal. The active braking function allows for a quick stop in order to improve stop/start cycles in gaming applications. The micropower sleep mode reduces current consumption to near zero current for battery management in portable applications.
The device is available in a low-profile 2 x 2 x 0.5 mm MLP package with 100 percent tin plating (EL package).
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. It maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With more than 2,000 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro, including free samples of our products, can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Tel: (508) 854-5363
sfennelly@allegromicro.com