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Allegro MicroSystems, Inc. Introduces Versatile High-Voltage
Step-Down Regulator
A8499 serves as a general-purpose buck regulator for several applications 
Worcester, MA, August 22, 2005 — Allegro MicroSystems, Inc. announces the release of the A8499 High-Voltage Step-Down Regulator. This general-purpose buck regulator can be used in a wide variety of applications; the 50 V input range makes it ideal for consumer electronics and industrial applications where 12 V/20 V/28 V/26 V input voltages may occur.
The A8499 can handle a wide input of operating voltage ranges. The regulator requires an external clamping diode, inductor and filter capacitor, and the off time is determined by an external resistor. It will operate in both continuous and discontinuous modes. An internal blanking circuit will be used to filter out transients due to the reverse recovery of the external clamp diode. Typical blanking time is 200 nS, and the output voltage is adjustable from 1.2 V to 24 V based on a resistor divider and the 1.2 V 3 percent reference.
The A8499 is ideal for various end products including applications with 8 to 50 V input voltage range needing a buck regulator for 1.5 A output current, consumer equipment power, uninterruptible power supplies, 12 V lighter-powered applications (portable DVD, etc.), automotive 9 to 16 V input applications with higher voltage protection, point of sale (POS) applications, and industrial applications with 24 V or 36 V bus. The A8499 is supplied in an eSOIC-8L package.
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