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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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