1

®

FN9147.8

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

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ISL6744

Intermediate Bus PWM Controller

The ISL6744 is a low cost, primary side, double-ended

controller intended for applications using full and half-bridge

topologies for unregulated DC/DC converters. It is a voltage-

mode PWM controller designed for half-bridge and full-

bridge power supplies. It provides precise control of

switching frequency, adjustable soft-start, precise deadtime

control with deadtimes as low as 35ns, and overcurrent

shutdown.

Low start-up and operating currents allow for easy biasing in

both AC/DC and DC/DC applications. This advanced

BiCMOS design features low start-up and operating

currents, adjustable switching frequency up to 1MHz, 1A

FET drivers, and very low propagation delays for a fast

response to overcurrent faults.

Features

• Precision Duty Cycle and Deadtime Control

• 100µA Start-up Current

• Adjustable Delayed Overcurrent Shutdown and Restart

• Adjustable Oscillator Frequency Up to 2MHz

• 1A MOSFET Gate Drivers

• Adjustable Soft-Start

• Internal Over Temperature Protection

• 35ns Control to Output Propagation Delay

• Small Size and Minimal External Component Count

• Input Undervoltage Protection

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Telecom and Datacom Isolated Power

• DC Transformers

• Bus Converters

Ordering Information

PART NUMBER

TEMP.

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6744AU

-40 to 105

8 Ld MSOP

M8.118

ISL6744AUZ

(Note)

-40 to 105

8 Ld MSOP

(Pb-free)

M8.118

ISL6744AB

-40 to 105

8 Ld SOIC

M8.15

ISL6744ABZ

(Note)

-40 to 105

8 Ld SOIC

(Pb-free)

M8.15

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.

Pinout

ISL6744 (SOIC, MSOP)

TOP VIEW

SS 1

RTD

CS

CT

GND

OUTA

OUTB

VDD

2

3

4

5

6

7

8

Data Sheet

September 22, 2005