LNBH221 Datasheet, PDF (1/18 Pages) STMicroelectronics – DUAL LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE

LNBH221
DUAL LNB SUPPLY AND CONTROL IC
WITH STEP-UP CONVERTER AND I²C INTERFACE
s ALL THE FEATURES ARE THE SAME FOR
BOTH SECTION
s COMPLETE AND INDEPENDENT
INTERFACE BETWEEN LNBs AND
RELEVANT I²C^TM BUS
s BUILT-IN DC/DC CONTROLLER FOR
SINGLE 12V SUPPLY OPERATION AND
HIGH EFFICIENCY (Typ. 93% @ 500mA)
s LNB OUTPUT CURRENT GUARANTEED UP
TO 500mA
s BOTH COMPLIANT WITH EUTELSAT AND
DIRECTV OUTPUT VOLTAGE
SPECIFICATION
s ACCURATE BUILT-IN 22KHz TONE
OSCILLATOR SUITS WIDELY ACCEPTED
STANDARDS
s FAST OSCILLATOR START-UP FACILITATES
DiSEqC^TM ENCODING
s BUILT-IN 22KHz TONE DETECTOR
SUPPORTS BI-DIRECTIONAL DiSEqC^TM 2.0
s SEMI-LOWDROP POST REGULATOR AND
HIGH EFFICIENCY STEP-UP PWM FOR
LOW POWER LOSS: Typ. 0.56W @ 125mA
s TWO OUTPUT PINS SUITABLE TO BYPASS
THE OUTPUT R-L FILTER AND AVOID ANY
TONE DISTORSION (R-L FILTER AS PER
DiSEqC 2.0 SPECs, see application circuit on
pag. 4)
s OVERLOAD AND OVER-TEMPERATURE
INTERNAL PROTECTIONS
s OVERLOAD AND OVER-TEMPERATURE I²C
DIAGNOSTIC BITs
s LNB SHORT CIRCUIT SOA PROTECTION
WITH I²C DIAGNOSTIC BIT
s +/- 4KV ESD TOLERANT ON INPUT/
OUTPUT POWER PINS
DESCRIPTION
Intended for analog and digital DUAL Satellite
STB receivers/SatTV, sets/PC cards, the
LNBH221 is a voltage regulator and interface IC,
assembled in POWER SO-36, specifically
designed to provide the power 13/18V, and the
22KHz tone signalling for two independent LNB
down converters or to a multiswitch box that could
be independently powered and set. In this applica-
tion field, it offers a complete solution with ex-
April 2004
PRELIMINARY DATA
PowerSO-36
tremely low component count, low power dissipa-
tion together with simple design and I²C^TM stan-
dard interfacing.
BLOCK DIAGRAM
Gate
Sense
Vup
Vcc
Byp
SDA
SCL
ADDR
DSQIN
Step-up
Controller
Preregul.+
U.V.lockout
+P.ON res.
V Select
I²C ^Enable
TEN
LNBH221- section A
Linear Post-reg
+Modulator
+Protections
Diagn.
22KHz
Oscill.
Tone
Detector
VoTX
VoRX
EXTM
DETIN
DSQOUT
Gate
Sense
Vup
Vcc
Byp
SDA
SCL
ADDR
DSQIN
Step-up
Controller
Preregul.+
U.V.lockout
+P.ON res.
V Select
I²C ^Enable
TEN
LNBH221- section B
Linear Post-reg
+Modulator
+Protections
Diagn.
22KHz
Oscill.
Tone
Detector
VoTX
VoRX
EXTM
DETIN
DSQOUT
1/18
This is preliminary information on a new product now in development are or undergoing evaluation. Details subject to change without notice.