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- About Allegro
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 A8291 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 A8291 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.
The A8291 has integrated tone detection capability, to support full two-way 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 DiSEqC™ filter bypass switch is also integrated, to minimize the output impedance during tone generation.
A comprehensive set of fault registers are provided, which comply with all the common standards, including: overcurrent, thermal shutdown, undervoltage, cable disconnect, power not good, and tone detect.
The device uses a 2-wire bidirectional serial interface, compatible with the I2C™ standard, that operates up to 400 kHz.
The A8291 is supplied in a lead (Pb) free 28-lead MLP/QFN.
These parts are in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: December 5, 2016. . Deadline for receipt of LAST TIME BUY orders: August 30, 2017
Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the generation 4 and 5 devices.
Astrorep Inc. (Allegro and Sanken Semiconductors,
Sanken Power Supplies)
700 Veterans Memorial Hwy
Hauppauge, NY 11788
If this is not your local representative, find your local sales rep here.
The A8291 is supplied in a lead (Pb) free 28-lead MLP/QFN (suffix ET).
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|Part Number||Package Type||Temperature||RoHS
|Part Composition /
|A8291SETTR-T||28-lead QFN||-20°C to 85°C||Yes||View Data||Last time buy||Contact your
local sales rep