Single LNB regulator IC raises switching frequency, cuts power

September 11, 2013 // By Graham Prophet
The A8304 from Allegro MicroSystems Europe is the latest member of a family of single low-noise block regulator (LNBR) ICs for satellite receiver applications.

The new device is a monolithic linear and switching voltage regulator which is specifically designed to provide the power and interface signals to an LNB down-converter via coaxial cable. The A8304 requires few external components, with the boost switch and compensation circuitry integrated into the device. The 704 kHz switching frequency and user-controlled output current limit minimise the size of the passive filtering components.

An I 2C-compatible interface provides control capabilities for complex system requirements, as well as diagnostic information for system fault reporting. A “sleep” pin is also available to maximise power savings and to quickly shut down the device if required, without using I 2C control. New control features for output source and sink current are also incorporated. The A8304SESTR-T is housed in a 3 x 3 mm QFN package (suffix ES) with exposed pad for thermal dissipation.

Allegro Microsystems; www.allegromicro.com/en/Products/Regulators-And-Lighting/LNB-Regulators-For-Satellite-Set-Top-Boxes/A8304.aspx