LNBH25 Datasheet, PDF (1/34 Pages) STMicroelectronics – Selectable output current limit by external resistor

LNBH25
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 receivers output
voltage specification (15 programmable levels)
■ 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
■ LPM function (low power mode) to reduce
dissipation
■ Overload and overtemperature internal
protections 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
QFN24 (4 x 4 mm)
Description
Intended for analog and digital satellite
receivers/Sat-TV and Sat-PC cards, the LNBH25
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.
Table 1.
Device summary
Order code
LNBH25PQR
Package
QFN24 (4 x 4)
Packaging
Tape and reel
February 2012
Doc ID 022433 Rev 4
1/34
www.st.com
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