DESCRIPTION
Intended for analog and digital satellite STB receivers/SatTV, sets/PC cards, the LNBP21 is a
monolithic voltage regulator and interface IC, assembled in SO-20 and PowerSO-20,
specifically designed to provide the power and the 13/18V, 22KHz tone signalling to the LNB down
converter in the antenna or to the multiswitch box. In this application field, it offers a complete
solution with extremely low component count, low power dissipation together with simple design and I²C^TM standard interfacing.

■ COMPLETE INTERFACE BETWEEN LNB AND I²C^TM BUS
■ BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION
■ ACCURATE BUILT-IN 22KHz TONE OSCILLATOR
■ SUITS WIDELY ACCEPTED STANDARDS
■ FAST OSCILLATOR START-UP FACILITATES DiSEqC^TM ENCODING
■ BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqC^TM
■ LOOP-THROUGH FUNCTION FOR SLAVE OPERATION
■ LNB SHORT CIRCUIT PROTECTION AND DIAGNOSTIC
■ CABLE LENGTH DIGITAL COMPENSATION
■ INTERNAL OVER TEMPERATURE PROTECTION
■ ESD RATING 4KV ON POWER INPUT-OUTPUT PINS