1

®

FN9044.2

ISL6443

300kHz Dual, 180° Out-of-Phase, Step-

Down PWM and Single Linear Controller

The ISL6443 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° out of phase reducing the RMS input

current and ripple voltage.

The ISL6443 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°C.

Features

• Wide Input Supply Voltage Range

- Variable 5.6V to 24V

- Fixed 4.5V to 5.6V

• Three Independently Programmable Output Voltages

• Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . 300kHz

• Out of Phase PWM Controller Operation

- Reduces Required Input Capacitance and Power

Supply Induced Loads

• No External Current Sense Resistor

• Bidirectional Frequency Synchronization for

Synchronizing Multiple ISL6443s

• Programmable Soft-Start

• Extensive circuit protection functions

- PGOOD

-UVLO

- Overcurrent

- Over-temperature

- Independent Shutdown for Both PWMs

• Excellent Dynamic Response

- Voltage Feed-Forward with Current Mode Control

• 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

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Power Supplies with Multiple Outputs

• xDSL Modems/Routers

• DSP, ASIC, and FPGA Power Supplies

• Set-Top Boxes

• Dual Output Supplies for DSP, Memory, Logic,

µP Core

and I/O

• Telecom Systems

Ordering Information

PART

NUMBER

PART

MARKING

TEMP.

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6443IR

ISL6443IR

-40 to 85

28 Ld 5x5 QFN L28.5x5

ISL6443IRZ

(See Note)

ISL6443IRZ

-40 to 85

28 Ld 5x5 QFN

(Pb-free)

L28.5x5

Add “-T” or “-TK” 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.

Data Sheet

August 9, 2006

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

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

Copyright © Intersil Americas Inc. 2005-2006. All Rights Reserved

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