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Allegro MicroSystems, Inc. Announces Full-Bridge Pre-Driver IC Targeted at High Power Automotive and Industrial Motors
New Gate-Driver IC (A3940)

Worcester, MA - April 28, 2003 — Allegro MicroSystems, Inc. announces the release of the A3940, a new power MOSFET pre-driver IC for large brush DC motors. Targeted at the automotive and industrial markets, the A3940 provides four high-current gate-drive outputs capable of driving a wide range of power N-Channel MOSFETs. Bootstrap capacitors are utilized to provide the above-battery supply voltage required for N-Channel FETs. An internal charge pump for the high side will allow for DC (100% duty cycle) operation of the bridge. 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.

Protection features include supply undervoltage and overvoltage, programmable dead time adjustment for cross-conduction protection, thermal shutdown, and motor lead short-to-supply and short-to-ground protection.

The A3940 is manufactured using Allegro's ABCD3 (Allegro Bipolar CMOS DMOS 3rd generation) process, and is supplied in either a 28-lead TSSOP thermally enhanced package or in a standard 28-lead SOIC package.

This full-bridge pre-driver IC is targeted to meet the needs of the automotive and industrial markets.

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

Technical Contact:
Bob Brodeur
Strategic Marketing Manager
Tel: (508) 854-5558
bbrodeur@allegromicro.com

Copyright © 2010 Allegro MicroSystems, Inc. • 115 Northeast Cutoff, Worcester, MA 01606 USA • Phone: 1.508.853.5000 • Fax: 1.508.853.7895