13 LNBH23L (U6)
13.1 Description
Intended for analog and digital satellite receivers,the LNBH23L is a monolithic voltage
regulator
and interface IC, assembled in QFN32 5 x 5 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, low power dissipation together with simple design and I²C standard
interfacing.
13.2 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
• Auxiliary modulation input (EXTM pin) facilitates DiSEqC™ 1.X encoding
• Accurate built-in 22 kHz tone generator suits widely accepted standards
• Low-drop post regulator and high efficiency step-up PWM with integrated power
NMOS allow low power losses
• Overload and over-temperature internal protections with I²C diagnostic bits
• LNB short circuit dynamic protection
• +/- 4 kV ESD tolerant on output power pins
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