LNBH221 datasheet(1/27 Pages) STMICROELECTRONICS

Il numero della parte	LNBH221

Spiegazioni elettronici	Dual LNB supply and control IC with Step-Up converter and I2C interface

PDF	27 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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1 / 27 page

February 2006

Rev. 5

1/27

27

LNBH221

Dual LNB supply and control IC with

Step-Up converter and I²C interface

Feature summary

I All the features are the same for both section

I Complete and independent interface between

LNBS and relevant I2CTM BUS

I BUILT-IN DC/DC controller for single 12V

supply operation and high efficiency (Typ. 93%

@ 500mA)

I LNB output current guaranteed up to 500mA

I Both compliant with eutelsat and directv output

voltage specification accurate BUILT-IN

22KHz tone oscillator suits widely accepted

standards

I Fast oscillator start-up facilitates DiSEqC

TM

encoding

I BUILT-IN 22KHz tone detector supports bi-

directional DiSEqCTM 2.0

I Semi-lowdrop post regulator and high

efficiency step-up pwm for low power loss: Typ.

0.56W @ 125mA

I 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. 7, 8)

I Overload and over-temperature internal

protections

I Overload and over-temperature I2C diagnostic

BITs

I LNB short circuit soa protection with I

2C

diagnostic bit

I +/- 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

application field, it offers a complete solution with

extremely low component count, low power

dissipation together with simple design and I2CTM

standard interfacing.

POWER SO-36

www.st.com

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