LNBH24L Datasheet, PDF (1/25 Pages) STMicroelectronics – Dual LNBS supply and control IC with step-up and I²C interface

LNBH24L
Dual LNBS supply and control IC with step-up and I²C interface
Features
■ Complete interface between LNBS 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) facilitates
DiSEqC™ 1.X encoding
■ Low-drop post regulator and high efficiency
step-up PWM with integrated power N-MOS
allow low power losses
■ Overload and over-temperature internal
protections with I²C diagnostic bits
■ Output voltage and output current level
diagnostic feedback by I²C bits
■ LNB short circuit dynamic protection
■ +/- 4 kV ESD tolerant on output power pins
Description
Intended for analog and digital DUAL satellite
receivers/Sat-TV, Sat-PC cards, the LNBH24L is
a monolithic voltage regulator and interface IC,
assembled in QFN 5x5 ePAD, specifically
designed to provide the 13 / 18 V power supply
and the 22 kHz tone signaling for two independent
LNB down-converters in the antenna dishes
and/or multi-switch box. In this application field, it
offers a dual tuner STBs complete solution with
extremely low component count, low power
dissipation together with simple design and I²C
standard interfacing.
QFN32 5 x 5 mm (ePad)
Table 1. Device summary
Order code
LNBH24LQTR
Package
QFN32 5 x 5 (Exposed pad)
Packaging
Tape and reel
March 2010
Doc ID 16857 Rev 2
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