Datasheet

February 2012 Doc ID 022634 Rev 2 1/28
28
LNBH25L
LNB supply and control IC with step-up and I²C interface
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 specifications
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
Overload and overtemperature internal
protection 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
Description
Intended for analog and digital satellite
receivers/Sat-TV and Sat-PC cards, the
LNBH25L 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)
Table 1. Device summary
Order code Package Packaging
LNBH25LPQR QFN24 (4 x 4) Tape and reel
www.st.com

Summary of content (28 pages)