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Intended for analog and digital dual satellite receivers/sat-TV, sat-PC cards, the LNBH24 is a monolithic voltage regulator and interface IC, assembled in PowerSSO-36 ePad, specifically designed to provide the 13/18 V power supply and the 22 kHz tone signalling for two independent LNB down-converters in the antenna dishes and/or multi-switch box. In this application field, it offers a dual tuner STBs with extremely low component count, low power dissipation together with simple design and I²C standard interfacing.

Features

Complete interface between LNBS 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 through external resistor

Compliant with main satellite receivers output voltage specification

New accurate built-in 22 kHz tone generator meets widely accepted standards (patent pending)

Fast oscillator start-up facilitates DiSEqC™ encoding

Built-in 22 kHz tone detector supports bidirectional DiSEqC™ 2.0

Very low-drop post regulator and high efficiency step-up PWM with integrated power N-MOS allow low power losses

Two output pins suitable for bypassing the output R-L filter and avoiding tone distortion (RL filter as per DiSEqC™ 2.0 specs, see typ. application circuits)

Overload and over-temperature internal protections with I²C diagnostic bits

Output voltage and output current level diagnostic feedback by I²C bits

LNB short circuit dynamic protection

+/- 4 kV ESD tolerant on output power pins

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