Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A8290, A8291, A8286 and A8292
Edited by the Electronicstalk Editorial
Team on 23 May 2007
Regulators power satellite receivers
Voltage regulator ICs are designed for use in the low noise block sections of analogue and digital satellite receivers.
Four new voltage regulator ICs from Allegro MicroSystems Europe are designed for use in the LNB (low noise block) sections of analogue and digital satellite receivers The A8290 and A8291 are single LNB supply control voltage regulators, while the A8286 and A8292 are dual LNB supply voltage regulators
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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These low-noise block convertor regulators are monolithic linear/switching voltage regulators, specifically designed to provide the power and interface signals to an LNB down-convertor via a coaxial cable.
The integrated boost switch in each device has been optimised to minimise both switching and static losses.
To further enhance efficiency, the voltage drop across the tracking regulator has also been minimised.
The A8290 (single) and A8286 (dual) devices provide the higher output current required by the latest satellite set-top box applications.
The A8286 provides up to 650mA per channel and 1.0A total continuous lead current, and the corresponding figures for the A8290 are 500 and 750mA.
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 diagnostic capabilities.
The regulator ICs require few external components because the boost switch, compensation circuitry, and sense resistor are all integrated into the solution.
The A8290 and A8291 also integrate an output filter bypass FET.
A high switching frequency is chosen to minimise the size of the passive filtering components to further assist in reducing cost.
All four devices are available in the 5 x 5mm QFN/MLP-28 package.
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