1

®

FN9124.1

ISL6842, ISL6843, ISL6844, ISL6845

Improved Industry Standard Single Ended

Current Mode PWM Controller

The ISL6842, ISL6843, ISL6844, ISL6845 family of

adjustable frequency, low power, pulse width modulating

(PWM) current mode controllers is designed for a wide range

of power conversion applications including boost, flyback,

and isolated output configurations. Peak current mode

control effectively handles power transients and provides

inherent over-current protection.

This advanced BiCMOS design is pin compatible with the

industry standard 384x family of controllers and offers

significantly improved performance. Features include low

operating current, 60

µA start-up current, adjustable

operating frequency to 2MHz, and high peak current drive

capability with 20ns rise and fall times.

Features

• 1A MOSFET gate driver

•60

µA startup current, 100µA maximum

• 30ns propagation delay current sense to output

• Fast transient response with peak current mode control

• Adjustable switching frequency to 2MHz

• 20ns rise and fall times with 1nF output load

• Trimmed timing capacitor discharge current for accurate

deadtime/maximum duty cycle control

• High bandwidth error amplifier

• Tight tolerance voltage reference over line, load, and

temperature

• Tight tolerance current limit threshold

Applications

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems

• PC Power Supplies

• Isolated Buck and Flyback Regulators

• Boost Regulators

Pinout

ISL6842, ISL6843, ISL6844, ISL6845

(8-PIN SOIC, MSOP)

TOP VIEW

Ordering Information

PART NUMBER

TEMP. RANGE

PACKAGE

PKG.

DWG. #

ISL6842IB

-40 to 105

8 Ld SOIC

M8.15

ISL6842IU

-40 to 105

8 Ld MSOP

M8.118

ISL6843IB

-40 to 105

8 Ld SOIC

M8.15

ISL6843IU

-40 to 105

8 Ld MSOP

M8.118

ISL6844IB

-40 to 105

8 Ld SOIC

M8.15

ISL6844IU

-40 to 105

8 Ld MSOP

M8.118

ISL6845IB

-40 to 105

8 Ld SOIC

M8.15

ISL6845IU

-40 to 105

8 Ld MSOP

M8.118

NOTE: Add -T to part number for Tape and Reel packaging.

PART NUMBER

RISING UVLO

MAX. DUTY CYCLE

ISL6842

14.4V

100%

ISL6843

8.4V

100%

ISL6844

14.4V

50%

ISL6845

8.4V

50%

COMP

FB

RTCT

VREF

VDD

OUT

GND

1

2

3

4

8

CS

7

6

5

Data Sheet

October 2003

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

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2003. All Rights Reserved.

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