LNBH23

更新时间： 2024-11-27 03:46:59

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		/
页数	文件大小	规格书
32页	516K
描述
LNBs supply and control IC with step-up and IC interface

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LNBH23 数据手册

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

PowerSSO-24

(Exposed pad)

QFN32 (5x5mm)

(Exposed pad)

specifications

■ New accurate built-in 22 kHz tone generator

suits widely accepted standards (patent

pending) see Figure 1 and Figure 4

Description

■ Fast oscillator start-up facilitates DiSEqC

encoding

Intended for analog and digital satellite

■ Built-in 22 kHz tone detector supports bi-

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.

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 to by-pass the output

R-L filter and avoid any 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

Table 1.

Device summary

Order code

Package

Packaging

LNBH23PPR

PowerSSO-24 (Exposed pad)

QFN32 (Exposed pad)

Tape and reel

LNBH23QTR ⁽¹⁾

1. Available on request.

March 2008

Rev 4

1/32

www.st.com

12 3 4 5 6 7...32

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