LNBH23 Datasheet, PDF (1/32 Pages) STMicroelectronics – LNBs supply and control IC with step-up and I²C interface

LNBH23
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% @
0.75 A), with integrated NMOS
■ Selectable output current limit by external
resistor
■ Compliant with main satellite receiver systems
specifications
■ New accurate built-in 22 kHz tone generator
suits widely accepted standards (patent
pending) see Figure 1 and Figure 4
■ Fast oscillator start-up facilitates DiSEqC^TM
encoding
■ Built-in 22 kHz tone detector supports bi-
directional DiSEqC^TM 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 to by-pass the output
R-L filter and avoid any tone distortion (R-L
filter as per DiSEqC^TM 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-24
(Exposed pad)
QFN32 (5x5mm)
(Exposed pad)
Description
Intended for analog and digital satellite
receivers/Sat-TV, sat-PC cards, the LNBH23 is a
monolithic voltage regulator and interface IC,
assembled in PowerSSO-24 ePAD and QFN32
(5x5 mm) ePAD, 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, low power
dissipation together with simple design and I²C
standard interfacing.
Table 1. Device summary
Order code
LNBH23PPR
LNBH23QTR ⁽¹⁾
1. Available on request.
March 2008
Package
PowerSSO-24 (Exposed pad)
QFN32 (Exposed pad)
Rev 4
Packaging
Tape and reel
Tape and reel
1/32
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