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廬

ISL6425

Data Sheet

February 8, 2005

FN9176.1

Single Output LNB Supply and Control

Voltage Regulator with I

2

C Interface for

Advanced Satellite Set-top Box Designs

The ISL6425 is a highly integrated solution for supplying

power and control signals from advanced satellite set-top

box (STB) modules to the low noise block (LNB). This device

is comprised of a current-mode boost PWM and a low-noise

linear regulator, along with the circuitry required for I

2

C

device interfacing and for providing DiSEqC standard control

signals to the LNB.

A regulated output voltage is available at the output terminal

(VOUT) to support the operation of the antenna port in

advanced satellite STB applications. The regulated output

may be set to either 13V or 18V by use of the voltage select

command (VSEL) through the I

2

C bus. Additionally, to

compensate for the voltage drop in the coaxial cable, the

voltage may be increased by 1V with the line length

compensation (LLC) feature. An enable command sent on

the I

2

C bus provides standby mode control for the PWM and

linear combination, disabling the output to conserve power.

A current-mode boost converter provides the linear regulator

with an input voltage that is set to the required output

voltage, plus 1.2V (typ.) to insure minimum power

dissipation. This maintains a constant voltage drop across

the linear pass element, while permitting an adequate

voltage range for tone injection.

The device is capable of providing 750mA (typ.).

Features

鈥?Switch-Mode Power Converter for Lowest Dissipation

- Boost PWM with >92% Efficiency

- Selectable 13V or 18V Outputs

- Digital Cable Length Compensation (1V)

鈥?External Pin to Select 13V/18V Options

鈥?DSQIN and SEL18V pins are 2.5V logic compatible

鈥?I

2

C Compatible Interface for Remote Device Control

- Registered Slave Address 0001 00XX

- Fully Functional 3.3V, 5V Operation up to 400kHz

鈥?Built-In Tone Oscillator Factory Trimmed to 22kHz

- Facilitates DiSEqC (EUTELSAT) Encoding

鈥?Internal Over-Temperature Protection and Diagnostics

鈥?Internal Overload and Overtemp Flags (Visible on I

2

C)

鈥?LNB Short-Circuit Protection and Diagnostics

鈥?QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat

No Leads - Product Outline

- Near Chip-Scale Package Footprint

鈥?Pb-free available (RoHS Compliant)

Applications

鈥?LNB Power Supply and Control for Satellite Set-Top Box

Ordering Information

PART NUMBER

ISL6425ER

ISL6425ER-T

ISL6425ERZ

(Note)

ISL6425ERZ-T

(Note)

TEMP.

RANGE (擄C)

-20 to 85

PACKAGE

PKG.

DWG. #

References

鈥?Tech Brief 389 (TB389) - 鈥淧CB Land Pattern Design and

Surface Mount Guidelines for QFN Packages鈥? Available

on the Intersil website, www.intersil.com

32 Ld 5x5 QFN L32.5x5

L32.5x5

32 Ld 5x5 QFN Tape and Reel

-20 to 85

32 Ld 5x5 QFN L32.5x5

(Pb-free)

L32.5x5

32 Ld 5x5 QFN Tape and Reel

(Pb-free)

NOTE: Intersil Pb-free products employ special Pb-free material sets;

molding compounds/die attach materials and 100% matte tin plate

termination finish, which are RoHS compliant and compatible with

both SnPb and Pb-free soldering operations. Intersil Pb-free products

are MSL classified at Pb-free peak reflow temperatures that meet or

exceed the Pb-free requirements of IPC/JEDEC J STD-020.

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

|

Intersil (and design) is a trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2004-2005. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

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