ISL6424ERZ Intersil, ISL6424ERZ Datasheet

ISL6424ERZ

Manufacturer Part Number

ISL6424ERZ

Description

IC REG DUAL LNBP TTL-INP 32-QFN

Manufacturer

Intersil

Datasheet

1.ISL6424ERZ.pdf (12 pages)

Specifications of ISL6424ERZ

Applications

Converter, Satellite Set-Top Box Designs

Voltage - Input

8 ~ 14 V

Number Of Outputs

Voltage - Output

13 ~ 18 V

Operating Temperature

-20°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 12
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Dual Output LNB Supply and Control

Voltage Regulator with I

Advanced Satellite Set-Top Box Designs

The ISL6424 is a highly integrated voltage regulator and

interface IC, specifically designed for supplying power and

control signals from advanced satellite set-top box (STB)

modules to the low noise blocks (LNBs) of two antenna

ports. The device is comprised of two independent current-

mode boost PWMs and two low-noise linear regulators along

with the circuitry required for 22kHz tone generation,

modulation and I

total LNB supply design simple, efficient and compact with

low external component count.

Two independent current-mode boost converters provide the

linear regulators with input voltages that are set to the final

output voltages, plus typically 1.2V to insure minimum power

dissipation across each linear regulator. This maintains

constant voltage drops across each linear pass element

while permitting adequate voltage range for tone injection.

The final regulated output voltages are available at two

output terminals to support simultaneous operation of two

antenna ports for dual tuners. The outputs for each PWM are

set to 13V or 18V by independent voltage select commands

(VSEL1, VSEL2) through the I

compensate for the voltage drop in the coaxial cable, the

selected voltage may be increased by 1V with the line length

compensation (LLC) feature. All the functions on this IC are

controlled via the I

and two bits will report the diagnostic status. Separate enable

commands sent on the I

mode control for each PWM and linear combination, disabling

the output into shutdown mode.

Each output channel is capable of providing 750mA of

continuous current. The overcurrent limit can be digitally

programmed. The SEL18V pin allows the 13V to 18V

transition with an external pin, overriding the I

The ISL6424 is offered in a 32 Ld 5x5 QFN.

C device interface. The device makes the

C bus by writing 8 bits on System

C bus provide independent standby

C bus. Additionally, to

C Interface for

Data Sheet

C input.

1-888-INTERSIL or 1-888-468-3774

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

Features

• Single Chip Power Solution

• Switch-Mode Power Converter for Lowest Dissipation

• I

• External Pins to Select 13V/18V Option

• DSQIN1&2 and SEL18V1&2 pins 2.5V Logic Compatible

• Built-In Tone Oscillator Factory Trimmed to 22kHz

• Internal Over-Temperature Protection and Diagnostics

• Internal Overload and Overtemp Flags (Visible on I

• LNB Short-Circuit Protection and Diagnostics

• QFN Package

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• LNB Power Supply and Control for Satellite Set-Top Box

References

• Tech Brief 389 (TB389) - “PCB Land Pattern Design and

Ordering Information

*Add “-T” suffix for tape and reel.

NOTE: Intersil Pb-free plus anneal 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.

ISL6424ER

ISL6424ERZ (Note) ISL6424ERZ -20 to 85 32 Ld 5x5 QFN

September 13, 2005

- True Dual Operation for 2-Tuner/2-Dish Applications

- Both Outputs May be Enabled Simultaneously at

- Integrated DC-DC Converter and I

- Boost PWMs with > 92% Efficiency

- Selectable 13V or 18V Outputs

- Digital Cable Length Compensation (1V)

- Registered Slave Address 0001 00XX

- Full 3.3V/5V Operation up to 400kHz

- Facilitates DiSEqC (EUTELSAT) Encoding

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

- Near Chip-Scale Package Footprint

Surface Mount Guidelines for QFN Packages”; Available

on the Intersil website, www.intersil.com

C Compatible Interface for Remote Device Control

Maximum Power

No Leads - Product Outline

PART # *

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

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

ISL6424ER -20 to 85 32 Ld 5x5 QFN L32.5x5

MARKING

PART

TEMP.

(°C)

C Interface

(Pb-free)

PACKAGE

ISL6424

FN9175.3

L32.5x5

DWG. #

PKG.

Related parts for ISL6424ERZ

ISL6424ERZ Summary of contents

Page 1

... C input. PART # * ISL6424ER ISL6424ERZ (Note) ISL6424ERZ - 5x5 QFN *Add “-T” suffix for tape and reel. NOTE: Intersil Pb-free plus anneal 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 ...

Page 2

Pinout ISL6424 (QFN) TOP VIEW PGND2 1 CS2 2 SGND 3 SEL18V1 4 ISL6424ER SEL18V2 5 BYP 6 PGND1 7 GATE1 ISL6424 26 25 CPSWOUT 24 ...

Page 3

Block Diagram OLF1 OVERCURRENT COUNTER PROTECTION DCL LOGIC SCHEME 1 PWM OC1 LOGIC GATE1 8 Q CLK1 S PGND1 7 ILIM1 CS - AMP CS1 ∑ 9 SLOPE COMPENSATION COMP1 11 - FB1 10 VREF1 VSW1 12 VO1 19 ON ...

Page 4

Typical Application Schematic P1 VIN P2 GND 5.1 1500pF L3 D1 100nH STPS2L40U C25 + C4 C27A C27B C5 1µF 1µF 10µF 10µF 56µ 33pF P3 VOUT1 SP1 D3 C21 STPS2L40U 0.1µF P4 GND ...

Page 5

Absolute Maximum Ratings Supply Voltage 8.0V to 18.0V CC Logic Input Voltage Range ...

Page 6

Electrical Specifications V = 12V LLC1 = LLC2 = L, ENT1 = ENT2 = L, DCL = L, DSQIN1 = DSQIN2 = L, Iout = 12mA, unless otherwise noted. See software description section for I PARAMETER 22kHz TONE ...

Page 7

Typical Performance Curves NOTE: With both channels in simultaneous operation at rated output Functional Pin Description SYMBOL FUNCTION 2 SDA Bidirectional data from/ bus. 2 SCL Clock from I C bus. VSW1, 2 Input of the linear post-regulator. ...

Page 8

When the ENT1/2 bit is set HIGH, a continuous 22kHz tone is generated regardless of the DSQIN1/2 pin logic status for the corresponding regulator channel (LNB-A or LNB-B). The ENT1/2 bit must be set LOW when the DSQIN1 and/or DSQIN2 ...

Page 9

The level of logic “0” and logic “1” is dependent of associated value per electrical specification table. One clock pulse is DD generated for each data bit ...

Page 10

System Register Format • Read and Write bit • Read-only bit • All bits reset Power- SR1 DCL SR2 ISEL2 2 Transmitted Data ( ...

Page 11

Received Data ( bus READ MODE The ISL6424 can provide to the master a copy of the system 2 register information via the I C bus in read mode. The read mode is Master activated by sending ...

Page 12

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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