ALLEGRO ARG81300SESWTR

The ARG81300 is a single-channel low-noise block regulator (LNBR). The ARG81300 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 ARG81300 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 ARG81300 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.

• Integrated boost MOSFET, current sensing, and compensation
• Stable with low-profile ceramic boost capacitors
• 704 kHz switching frequency for small low-cost components
• SLEEP pin for ultralow power consumption mode
• Adjustable LNB output current limit (250 to 950 mA) 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 control
• 2-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
• Cable disconnect detect