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 receiver output voltage specification (15
programmable levels)
• Accurate built-in 22 kHz tone generator suits widely accepted standards
• 22 kHz tone waveform integrity guaranteed at no-load condition as well
• Low drop post regulator and high efficiency step-up PWM with integrated power
NMOS allowing low power losses
• LPM function (low power mode) to reduce dissipation
• Overload and overtemperature internal protection with I²C diagnostic bits
• LNB short-circuit dynamic protection
• +/- 4 kV ESD tolerant on output power pins

Description
Intended for analog and digital dual satellite receivers/Sat-TV, and Sat-PC cards, the
LNBH26S is a monolithic voltage regulator and interface IC, assembled in QFN24 4 x
4 specifically designed to provide the 13/18 V power supply and the 22 kHz tone
signaling to the LNB down-converter in the antenna dishes or to the multi-switch box.
In this application field, it offers a complete solution for dual tuner satellite receivers
with extremely low component count, low power dissipation together with simple
design and I²C standard interfacing.

Applications
• STB satellite receivers
• TV satellite receivers
• PC card satellite receivers