Part # LNBS21 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: NB supply and control IC with step-up converter and I²C interface

Part Details:

LNBS21 LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE s COMPLETE INTERFACE BETWEEN LNB AND I2CTM BUS s BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION s ACCURATE BUILT-IN 22KHz TONE OSCILLATOR s SUITS WIDELY ACCEPTED STANDARDS PowerSO-20 s FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING s BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM s LOOP-THROUGH FUNCTION FOR SLAVE OPERATION assembled in PowerSO-20, specifically designed s LNB SHORT CIRCUIT PROTECTION AND to provide the power and the 13/18V, 22KHz tone DIAGNOSTIC signalling to the LNB downconverter in the s CABLE LENGTH DIGITAL COMPENSATION antenna or to the multiswitch box. In this s INTERNAL OVER TEMPERATURE application field, it offers a complete solution with PROTECTION extremely low component count, low powerdissipation together with simple design and I2CTM DESCRIPTION standard interfacing. Intended for analog and digital satellite STB This IC has a built in DC/DC step-up controller receivers/SatTV, sets/PC cards, the LNBS21 is a that, from a single supply source ranging from 8 to monolithic voltage regulator and interface IC, 15V, generates the voltages that let the linear Figure 1: Schematic Diagram LNBS21 Gate LT1 Sense Feedback Step-up Controller LT2 Vup OUT Vcc Preregul.+

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LNBS21.pdf Datasheet