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Allegro MicroSystems, Inc. Announces a Low-Cost 2.8 A
DMOS Motor Driver in Small Footprint Package
A3949SLP, A3949SLB Designed
as Most Cost-Effective, High-Current Motor Driver 
Worcester, MA — January 20, 2004 — Allegro MicroSystems, Inc. announces the release of a new DMOS full-bridge motor driver IC for dc motor applications. Designed to operate with a single supply, and with an output rating of 36 V at 2.8 A, the A3949 is intended to be the smallest, most cost-effective high-current DMOS motor driver available on the market today.
To further complement this motor driver's high performance, the A3949 is offered in a very small outline, 16-lead thermally enhanced TSSOP package (5.0 mm x 4.4 mm). This package has an exposed thermal pad, which allows for excellent thermal performance at less then 35% the area of a comparable SOIC package.
PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a dc motor with externally applied PWM control signals. Low rDS(on) DMOS outputs are combined with internal synchronous rectification control circuitry to further reduce power dissipation. With a sleep mode providing currents of less than 10 mA, the A3949 is ideally suited for office equipment, medical and portable applications.
"This solution provides the users with low-cost, high-current capability, all in an extremely small and thermally efficient package," said Tom Rowan, Allegro's Motor Control Strategic Marketing Manager.
This A3949 is manufactured using Allegro's ABCD3 (Allegro Bipolar CMOS DMOS 3rd generation) process, and is supplied in either a 16-lead thermally enhanced TSSOP package or a 16-lead SOIC package with copper batwing tab (suffix "LB").
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