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Allegro Introduces a New Automotive Grade Quasi-Resonant Discontinuous Flyback Converter Control IC
Fits Wide Range of Power Requirements

Worcester, MA – October 3, 2007 — Allegro MicroSystems, Inc. announces a new automotive grade quasi-resonant, discontinuous flyback converter control IC which supports a wide range of power requirements via the sizing of the external MOSFET and magnetics. It is designed to work over the automotive battery voltage range of 7 V to 40 V, and over the temperature range of -40°C to +125°C ambient. This new converter control IC is targeted primarily for use in vacuum florescent display (VFD) power supplies, which require multiple voltage rails. The IC could also be used in numerous other automotive applications that require several regulated voltage rails.

The A4401 includes an integrated transconductance amplifier, which can be used to monitor and regulate the voltage on either one or several outputs where good cross-regulation is required. This new device includes many other valuable features such as soft-start, low quiescent SLEEP mode, high voltage enable (EN) pin, and a novel adaptive quasi-resonant switching scheme, which minimizes radiated emissions.

Internal diagnostics provide comprehensive protection against overloads, input under-voltage and over-temperature conditions. In a typical application, the A4401 greatly simplifies the flyback converter, which is required to drive the anode, grid, and filament of a vacuum fluorescent display (VFD) system.

The A4401 is supplied in an industry standard 8L SOIC package.

About Allegro

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power integrated circuits and integrated Hall-effect magnetic sensors. 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

Copyright © 2008 Allegro MicroSystems, Inc. • 115 Northeast Cutoff, Worcester, MA 01606 USA • Phone: 1.508.853.5000 • Fax: 1.508.853.7895