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. QFN24 (4 x 4 mm)

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