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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 to 34 V. Each output is adjustable from 0.8 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 × 4 mm QFN package make this new device an ideal choice for many portable, office automation, and consumer applications. 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.


www.allegromicro.com
508-853-5000
  
Allegro MicroSystems, Inc.
http://www.allegromicor.com