A8304 Datasheet | Allegro MicroSystems

Single LNB Supply and Control Voltage Regulator Features AND BENEFITS - Integrated boost MOSFET, current sensing, and pensation - 704 k Hz switching frequency for small low-cost ponents - S¯ ¯L¯ ¯E¯ ¯E¯ ¯P pin for ultralow power consumption mode - Adjustable LNB output current limit (250 to 950 m A- ) limit with shutdown timer ▫ Covers wide array of application requirements ▫ Minimizes ponent 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%) - patible with Di SEq C1.x control Continued on the next page… PACKAGE: 3 mm × 3 mm × 0.75 mm 16-contact QFN (suffix ES) DESCRIPTION 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 ponents, with the boost switch and pensation circuitry integrated inside of the device. The 704 k Hz switching frequency and user-controlled output current limit minimize the size of the passive filtering ponents. The I2C™-patible interface provides control capabilities for plex 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. Not to scale C2 100 µF C1 100 n F VIN VREG C3 220 n F GND PAD VDD R1 R2 R3 R4 R5 C7 100 n F TCAP TONECTRL SDA SCL ADD...