LNBH25LPQR Datasheet, PDF (1/28 Pages) STMicroelectronics – LNB supply and control IC with step-up and I2C interface

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
QFN24 (4 x 4 mm)
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.
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
Table 1. Device summary
Order code
Package
LNBH25LPQR
QFN24 (4 x 4)
Packaging
Tape and reel
February 2012
Doc ID 022634 Rev 2
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www.st.com
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