LNBH25

LNBH25 LNB supply and control IC with step-up and I²C interface Features ■ Complete interface between LNB and I²C bus ■ Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93 % @ 0.5 A) ■ Selectable output current limit by external resistor ■ Compliant with main satellite receivers output voltage specification (15 programmable levels) ■ Accurate built-in 22 kHz tone generator suits widely accepted standards ■ 22 kHz tone waveform integrity guaranteed also at no load condition ■ Low-drop post regulator and high efficiency step-up PWM with integrated power N-MOS allowing low power losses ■ LPM function (low power mode) to reduce dissipation ■ Overload and overtemperature internal protections with I²C diagnostic bits ■ LNB short-circuit dynamic protection ■ +/- 4 kV ESD tolerant on output power pins Applications ■ STB satellite receivers ■ TV satellite receivers ■ PC card satellite receivers QFN24 (4 x 4 mm) Description Intended for analog and digital satellite receivers/Sat-TV and Sat-PC cards, the LNBH25 is a monolithic voltage regulator and interface IC, assembled in QFN24 4x4 specifically designed to provide the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the antenna dish or to the multi-switch box. In this application field, it offers a complete solution with extremely low component count and low power dissipation together with a simple design and I²C standard interfacing. Table 1. Device summary Order...