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Allegro MicroSystems, Inc. Announces a New DMOS Dual
Full-Bridge PWM Motor Driver
Efficient Motor Driver Designed for Applications With Two DC Motors 
Worcester, MA, December 22, 2006 — Allegro® MicroSystems, Inc. announces a new DMOS dual full-bridge PWM motor driver designed to control two DC motors at currents up to 2.4 A. Capable of drive voltages up to 36 V, the Allegro A3995 includes two independent fixed off-time PWM current regulators that operate in either fast or slow decay mode, determined by the MODE input. This new motor driver is targeted at the office automation and industrial markets.
Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. PHASE, ENABLE, and MODE inputs are provided for use in controlling the speed, torque, direction, and brake and coast functions of a DC motor. Protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover current protection. Special power-up sequencing is not required.
Allegro’s 3995 is supplied in a lead (Pb) free 36L QFN package with exposed power tab for enhanced thermal dissipation. It has a 6 mm × 6 mm footprint and 0.90 mm nominal height.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com