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High-Performance Power ICs and Hall-Effect Sensors
Allegro® Announces New DC-to-DC Step-Down Converter
Series
Highly Efficient Switching Regulators Using Higher Operating Frequencies
and Cost-Effective External Components 
Worcester, MA, July 30, 2007 — Allegro MicroSystems, Inc. introduces a new family of highly efficient switching regulators with high operating frequencies and cost-effective external components. This new series of devices addresses a market need for increased energy saving electric and electronic equipment targeted toward the portable and office automation markets.
By connecting an open collector transistor, the user is able to set an ON/OFF control for output voltage. Moreover, many of these devices offer a soft-start option that is set by an external capacitor at pin 5.
All devices within this series provide UVLO (under-voltage lock out) protection to avoid abnormal IC operation when the input voltage is less than the minimum operating level. Autoregression OCP and OTP protection is also built-in. The reduction of die size improves IC response speed making higher oscillation frequencies attainable. The SI-8000T/F operates at 300 kHz, the SI-8000H at 150 kHz, the SI-8000J at 125 kHz, and the SI-8000S at 60 kHz.
About Allegro
Allegro MicroSystems, Inc. is a global leader in the development, manufacture and marketing of high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro's innovative, system-level solutions serve high-growth applications within the automotive, computer/office automation, industrial, consumer and communications markets. With more than 2,500 employees, Allegro is headquartered in Worcester, MA. 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
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