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廬

I GNS

DE S

NE W

FO R

441

ED

ISL6

EN D

Data

MM EFER TO

December 1, 2004

O

Sheet

R EC

R

T

NO

A SE

PL E

ISL6402A

FN9010.3

1.4MHz Dual, 180擄 Out-of-Phase, Step-

Down PWM and Single Linear Controller

The ISL6402A is a high-performance, triple-output controller

optimized for converting wall adapter, battery or network

intermediate bus DC input supplies into the system supply

voltages required for a wide variety of applications. Each

output is adjustable down to 0.8V. The two PWMs are

synchronized 180

o

out of phase reducing the RMS input

current and ripple voltage.

The ISL6402A incorporates several protection features. An

adjustable overcurrent protection circuit monitors the output

current by sensing the voltage drop across the lower

MOSFET. Hiccup mode overcurrent operation protects the

DC-DC components from damage during output

overload/short circuit conditions. Each PWM has an

independent logic-level shutdown input (SD1 and SD2).

A single PGOOD signal is issued when soft-start is complete

on both PWM controllers and their outputs are within 10% of

the set point and the linear regulator output is greater than

75% of its setpoint. Thermal shutdown circuitry turns off the

device if the junction temperature exceeds +150擄C.

Features

鈥?Wide Input Supply Voltage Range . . . . . . . . . 4.5V to 24V

鈥?Three Independently Programmable Output Voltages

鈥?Switching Frequency . . . . . . . . . . . . . . . . . . . . . . .1.4MHz

鈥?Out of Phase PWM Controller Operation

- Reduces Required Input Capacitance and Power

Supply Induced Loads

鈥?No External Current Sense Resistor

- Uses Lower MOSFET鈥檚 r

DS(ON)

鈥?Bi-directional Frequency Synchronization for

Synchronizing Multiple ISL6402As

鈥?Programmable Soft-Start

鈥?Extensive circuit protection functions

- PGOOD

- UVLO

- Overcurrent

- Overtemperature

- Independent Shutdown for Both PWMs

鈥?Excellent Dynamic Response

- Voltage Feed-Forward with Current Mode Control

鈥?QFN Packages:

- QFN - Compliant to JEDEC PUB95 MO-220

QFN - Quad Flat No Leads - Package Outline

- Near Chip Scale Package footprint, which improves

PCB efficiency and has a thinner profile

鈥?Pb-Free Available (RoHS Compliant)

Ordering Information

PART NUMBER

ISL6402AIR

ISL6402AIR-T

ISL6402AIR-TK

ISL6402AIRZ

(See Note)

ISL6402AIRZ-T

(See Note)

TEMP. RANGE

(擄C)

-40 to 85

PACKAGE

28 Ld QFN

PKG.

DWG. #

L28.5x5

L28.5x5

L28.5x5

L28.5x5

L28.5x5

28 Ld QFN Tape and Reel

28 Ld QFN Tape and Reel

-40 to 85

28 Ld QFN

(Pb-free)

28 Ld QFN Tape and Reel

(Pb-free)

Applications

鈥?Power Supplies with Multiple Outputs

鈥?xDSL Modems/Routers

鈥?DSP, ASIC, and FPGA Power Supplies

鈥?Set-Top Boxes

鈥?Dual Output Supplies for DSP, Memory, Logic,

碌P

Core

and I/O

鈥?Telecom Systems

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-020C.

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 registered trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2004. All Rights Reserved

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

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