A8304: Single LNB Supply and Control Voltage Regulator

The A8304 is a single channel low noise block regulator (LNBR). The A8304 consists of a monolithic boost converter followed by a low-drop linear regulator. It is specifically designed to provide the power and the interface signals to an LNB down converter via coaxial cable in satellite TV receiver systems.

The A8304 requires few external components, with the boost switch and compensation circuitry integrated inside of the device. The 704 kHz switching frequency and user-controlled output current limit minimize the size of the passive filtering components.

The I2C™-compatible interface provides control capabilities for complex system requirements, as well as diagnostic capabilities for system fault reporting.

A sleep pin is available to maximize power savings and to quickly shut down the device if needed, without using I2C™ control.

The A8304 is provided in a small 3 × 3 mm QFN package with exposed pad for thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
700 Veterans Memorial Hwy
Suite 310
Hauppauge, NY 11788
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
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  • Integrated boost MOSFET, current sensing, and compensation
  • 704 kHz switching frequency for small low-cost components
  • SLEEP pin for ultra-low power consumption mode
  • Adjustable LNB output current limit (250 to 950 mA*) limit with shutdown timer
    • Covers wide array of application requirements
    • Minimizes component sizing to fit each application
    • For startup, reconfiguration, and continuous output
  • Boost peak current limit scales with LNB current limit
  • Optional temporary increased current limit (+25%)
  • Compatible with DiSEqC1.x control2-wire I2C™-compatible interface for control and status
    • Programmable LNB output voltage levels (2% accuracy)
    • Enable/disable output
    • Flexible 22 kHz tone generation methods
    • SINK_DIS bit for controlling the push-pull output sink current threshold
  • Diagnostic features: PNG
  • Extensive protection features: UVLO, OCP, TSD

*maximum value depends on PCB thermal design


Click the image to view larger
Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8304SESTR-T 16-lead QFN -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
APEK8304SES-01-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check Stock

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.

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