Intended for analog and digital satellite receivers, this single low noise block converter regulator (LNBR) is a monolithic linear and switching voltage regulator, specifically designed to provide the power and the interface signals to an LNB down converter via coaxial cable. The A8294 requires few external components, with the boost switch and compensation circuitry integrated inside of the device. A high switching frequency is chosen to minimize the size of the passive filtering components, further assisting in cost reduction. The high levels of component integration ensure extremely low noise and ripple figures.
The A8294 has been designed for high efficiency, utilizing the Allegro® advanced BCD process. 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.
For DiSEqC™ communications, several schemes are available for generating tone signals, all the way down to no-load, and using either the internal clock or an external time source.
A comprehensive set of fault registers are provided, which comply with all the common standards, including: overcurrent, thermal shutdown, undervoltage, and power not good.
The device uses a 2-wire bidirectional serial interface, compatible with the I2C™ standard, that operates up to 400 kHz.
The A8294 is supplied in a lead (Pb) free MLP/QFN package, ES, 20-contact, 4 mm × 4 mm, 0.75 nominal overall height.
This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.
Date of status change: June 5, 2017
Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the generation 4 and 5 devices.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.