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Allegro® Announces Four New Satellite STB Voltage
Regulators For LNB Power Supply And Control
Highly Efficient Regulators with Integrated FETs and Sense Resistors 
Worcester, MA, December 22, 2006 — Allegro® introduces two new single LNB supply control voltage regulators (A8290 and A8291) and two dual LNB supply voltage regulators (A8286 and A8292) all designed for high efficiency, utilizing our advanced BCD process. The low-noise block converter regulators (LNBRs) are monolithic linear/switching voltage regulators, specifically designed to provide the power and interface signals to an LNB downconverter via a coaxial cable. The integrated boost switch has been optimized to minimize both switching and static losses. To further enhance efficiency, the voltage drop across the tracking regulator has been minimized.
The A8290 (single) and A8286 (dual) devices provide the higher output current required by the latest satellite STB applications, while the A8291 (single) and A8292 (dual) versions have lower current limits for more traditional requirements.
All four devices offer “push/pull” output stages with the ability to sink and source current, and a static current limit with overcurrent timer mode. They also offer a “Cable Disconnect” function in addition to a wide variety of other diagnostics.
The devices also require few external components, with the boost switch, compensation circuitry, and sense resistor integrated into the solution. The A8290 and A8291 also integrate an output filter bypass FET . A high switching frequency is chosen to minimize the size of the passive filtering components to further assist in reducing cost.
Allegro’s A8290 and A8291 are available in the 5x5 mm QFN/MLP-28 package. Allegro’s A8286 and A8292 are also available in the 5x5 mm QFN/MLP-28 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