A8285 Datasheet | Allegro MicroSystems

Features and Benefits - LNB selection and standby function - Provides up to 500 m A load current - Two-wire serial I2C interface - Built-in tone oscillator, factory-trimmed to 22 k Hz; facilitates Di SEq C™ 2.0 encoding - Auxiliary modulation input - 22 k Hz tone detector facilitates Di SEq C™ decoding (A8287 only) - Tracking switch-mode power converter for lowest dissipation - LNB overcurrent protection and diagnostics - Internal overtemperature protection - LNB voltages (16 possible levels) patible with all mon standards Packages 16-pin SOIC (A8285) 24-pin SOIC (A8287) Description Intended for analog and digital satellite receivers, the LNB (low noise block) converter regulator is a monolithic linear and switching voltage regulator, specifically designed to provide power and interface signals to an LNB downconverter, via coaxial cable. The device uses a 2-wire bidirectional serial interface, patible with the I2C (Inter-C bus) standard, that operates up to 400 k Hz. The A8285 is supplied in a 16-lead plastic power SOIC with internally fused leads for thermal dissipation. The A8287 is supplied in a 24-lead plastic power SOIC with internally fused leads. Both devices are also available in lead (Pb) free versions, with 100% matte tine leadframe plating. V IN C10 100 n F Functional Block Diagram C1 33 µF L1 33 µH D1 C5 100 n F C2 C4 100 n F 100 µF VREG C3 220 n F EXTM R3 R4 R5 VDD SDA SCL ADD Internal Regulator BOOST Feedback OSC In Boost Converter LX VCP Charge Pump VPUMP Overcurrent BOOST Clock Divider 22 k Hz Tone...