LNBH26LSPQR

LNBH26LS Dual LNBS supply and control IC with step-up and IC interface Datasheet - production data LNB short-circuit dynamic protection +/- 4 kV ESD tolerant on output power pins Applications STB satellite receivers TV satellite receivers PC card satellite receivers Description Features Intended for analog and digital dual satellite receiver/Sat-TV, Sat-PC cards, the LNBH26LS is Complete interface between then LNB and a monolithic voltage regulator and IC interface, IC bus assembled in QFN24 (4x4 mm) specifically Built-in DC-DC converter for single 12 V designed to provide the 13/18 V power supply supply operation and high efficiency (typ. and the 22 kHz tone signaling to the LNB down- 93% 0.5 A) converter in the antenna dishes or to the multi- Selectable output current limit by external switch box. In this application field, it offers a resistor complete solution for dual tuner satellite receivers Compliant with main satellite receiver output with extremely low component count, low power voltage specification (8 programmable dissipation together with simple design and IC levels) standard interfacing. Accurate built-in 22 kHz tone generator suits widely accepted standards Table 1: Device summary 22 kHz tone waveform integrity guaranteed Order code Package Packing also at no load condition QFN24 Low drop post regulator and high efficiency LNBH26LSPQR Tape and reel (4x4 mm) step-up PWM with integrated power NMOS allowing low power losses Overload and overtemperature internal protection with IC diagnostic bits April 2015 DocID025504 Rev 2 1/35 www.st.com This is information on a product in full production. Contents LNBH26LS Contents 1 Block diagram .................................................................................. 6 2 Application information (valid for each section A/B) .................... 7 2.1 DISEQC data encoding (DSQIN pin) ............................................. 7 2.2 Data encoding by external 22 kHz tone TTL signal ........................... 7 2.3 Data encoding by external DiSEqC envelope control through the DSQIN pin ...................................................................................................... 8 2.4 Output current limit selection ............................................................. 8 2.5 Output voltage selection .................................................................... 8 2.6 Diagnostic and protection functions .................................................. 8 2.7 Surge protection and TVS diodes ..................................................... 9 2.8 Power-on IC interface reset and undervoltage lockout .................... 9 2.9 PNG: input voltage minimum detection ............................................. 9 2.10 COMP: boost capacitors and inductor ............................................... 9 2.11 OLF: overcurrent and short-circuit protection and diagnostic .......... 10 2.12 OTF: thermal protection and diagnostic .......................................... 10 3 Pin configuration ........................................................................... 11 4 Maximum ratings ........................................................................... 14 5 Typical application circuits ........................................................... 15 6 IC bus interface ............................................................................ 17 6.1 Data validity..................................................................................... 17 6.2 Start and stop condition .................................................................. 17 6.3 Byte format ...................................................................................... 17 6.4 Acknowledge ................................................................................... 17 6.5 Transmission without acknowledge ................................................. 17 7 IC interface protocol .................................................................... 19 7.1 Write mode transmission ................................................................. 19 7.2 Read mode transmission ................................................................ 20 7.3 Data registers .................................................................................. 21 7.4 Status registers ............................................................................... 23 8 Electrical characteristics .............................................................. 25 8.1 Output voltage selection .................................................................. 27 9 Package information ..................................................................... 29 2/35 DocID025504 Rev 2