Allegro MicroSystems, Inc. Announces New Triple Output Step Down Switching Regulator An Ideal Choice for Portable, Office Automation and Consumer Applications

Worcester, MA ¨C April 14, 2008 ¡ª Allegro® announces a new triple output step down switching regulator. Allegro¡¯s A4490 provides three high current, adjustable, high performance, switching regulator outputs with an input voltage range of 4.5 V to 34 V. Each output is adjustable from 0.8 V to 5 V with a maximum current of 2 A. Multiphase switching reduces EMI and minimizes stress on input capacitors by interleaving the turn-on cycle of the regulators. Features like soft start, power on reset output and a small 4 ¡Á 4  mm QFN package make this new device an ideal choice for many portable, office automation, and consumer applications.
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The 550 kHz fixed frequency switching allows selection of small, inexpensive inductors and ceramic output capacitors. A charge pump is used to provide the supply to drive the power switches to ensure operation at very wide operating duty cycles and to avoid the need for power draining clamp circuits.

A power-on-reset circuit with programmable delay indicates when enabled regulators are in specification. The power-on-reset flag also indicates when the input voltage drops below specification, giving the system controller advance warning whilst the switchers continue to operate down to the shutdown level. Internal diagnostics provide comprehensive protection against, overloads, input under voltages and over temperatures.

Allegro¡¯s A4490 is supplied in a low profile (0.75 mm) 4 ¡Á 4 mm, 20 pin QFN package with exposed power tab.

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.

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