LNBH26L Datasheet, PDF (1/28 Pages) STMicroelectronics – Selectable output current limit by external resistor

LNBH26L
Dual LNBS 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 specification (8 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
■ 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
QFN24 (4x4 mm)
Description
Intended for analog and digital DUAL satellite
receivers/Sat-TV, Sat-PC cards, the LNBH26L 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 dishes or to the multi-switch box. In
this application field, it offers a complete solution
for dual tuner satellite receivers with an extremely
low component count and low power dissipation
together with simple design and I²C standard
interfacing.
Table 1. Device summary
Order code
LNBH26LPQR
March 2012
Package
QFN24 (4x4)
Doc ID 022876 Rev 1
Packaging
Tape and reel
1/28
www.st.com
28