Part # LNBEH21 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics


Part Details:

LNBEH21 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 AND HIGH EFFICIENCY (Typ. 94% @ 750mA) s TWO SELECTABLE OUTPUT CURRENT LIMIT (450mA / 750mA) PowerSO-20 s ACCURATE BUILT-IN 22KHz TONE OSCILLATOR SUITS WIDELY ACCEPTED STANDARDS s LNB SHORT CIRCUIT SOA PROTECTION WITH I2C DIAGNOSTIC BIT s FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING s +/- 4KV ESD TOLERANT ON INPUT/OUTPUT POWER PINS s BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM 2.0 DESCRIPTION s 13/18V CONTROL WORD Intended for analog and digital satellite STB COMMUNICATION receivers/SatTV, sets/PC cards, the LNBEH21 is s SEMI-LOWDROP POST REGULATOR AND a monolithic voltage regulator and interface IC, HIGH EFFICIENCY STEP-UP PWM FOR assembled in POWER SO-20, specifically LOW POWER LOSS: Typ. 0.56W @ 125mA designed to provide the 13/18V power supply and s TWO OUTPUT PINS SUITABLE TO BYPASS the 22KHz tone signalling to the LNB THE OUTPUT R-L FILTER AND AVOID ANY downconverter in the antenna or to the multiswitch TONE DISTORSION (R-L FILTER AS PER box. The LNBEH21 supports both methods of DiSEqC 2.0 SPECs, SEE APPLICATION communication currently used, 13/18V Control CIRCUIT) Word Communication Mode and DiSEqCTM s CABLE LENGTH DIGITAL COMPENSATION communication. In this application field, it offers a s OVERLOAD AND OVER-TEMPERATURE complete solution with extremely low component INTERNAL PROTECTIONS I2C WITH count, low power dissipation together with simple DIAGNOSTIC BITs

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LNBEH21.pdf Datasheet