LNBH24_0808 Datasheet, PDF (1/30 Pages) STMicroelectronics – Dual LNB supply and control IC with step-up and I²C interface

LNBH24
Dual LNB 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 through external
resistor
■ Compliant with main satellite receivers output
voltage specification
■ New accurate built-in 22 kHz tone generator
meets widely accepted standards (patent
pending)
■ Fast oscillator start-up facilitates DiSEqC^™
encoding
■ Built-in 22 kHz tone detector supports bi-
directional DiSEqC^™ 2.0
■ Very low-drop post regulator and high
efficiency step-up PWM with integrated power
N-MOS allow low power losses
■ Two output pins suitable for bypassing the
output R-L filter and avoiding tone distortion (R-
L filter as per DiSEqC^™ 2.0 specs, see typ.
application circuits)
■ 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
PowerSSO-36 (ePad)
monolithic voltage regulator and interface IC,
assembled in PowerSSO-36 ePad, specifically
designed to provide the 13/18 V power supply and
the 22 kHz tone signalling 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 with extremely low
component count, low power dissipation together
with simple design and I²C standard interfacing.
Description
Intended for analog and digital DUAL Satellite
receivers/Sat-TV, sat-PC cards, the LNBH24 is a
Table 1. Device summary
Order code
Package
LNBH24PPR
PowerSSO-36 (Exposed pad)
Packaging
Tape and reel
August 2008
Rev 2
1/30
www.st.com
30