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Allegro Announces New Low-Voltage Stepper/Dual Dc
Motor Driver
Small Package Size, Low Voltage Operation and Low sleep Mode Current 
Worcester, MA, May 19, 2006 — Allegro MicroSystems, Inc. announced today the first device in a planned series of low-voltage motor drivers targeted at the portable market. Allegro's A3901 is a dual H-bridge low-voltage motor driver capable of operating one stepper motor or two DC motors. MOSFET output stages substantially reduce the voltage drop and the power dissipation of the outputs of the A3901 compared to typical drivers with bipolar transistors.
The A3901 is designed for portable applications with a power off (sleep mode) current of 50 nA (typical) and an operating voltage range of 2.5 V to 5.5 V. Output current can be regulated by pulse width modulating (PWM) the inputs. Both H-bridges can be paralleled for higher current operation. Allegro's A3901 offers a very small package size, low operating voltage and low voltage drop MOSFET outputs. Internal circuit protection includes thermal shut down with hysteresis, transient-suppression diodes and crossover current protection.
The A3901 is supplied in lead-free (100% matte tin leadframe) ten-lead MLP power package (3 x 3 x 0.75 mm) with exposed thermal pad (suffix EJ).
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