1

®

FN6320.3

ISL8840A, ISL8841A, ISL8842A,

ISL8843A, ISL8844A, ISL8845A

High Performance Industry Standard

Single-Ended Current Mode PWM

Controller

The ISL884xA is a high performance drop-in replacement for

the popular 28C4x and 18C4x PWM controllers suitable for a

wide range of power conversion applications including

boost, flyback, and isolated output configurations. Its fast

signal propagation and output switching characteristics

make this an ideal product for existing and new designs.

Features include 30V operation, low operating current, 90

μA

start-up current, adjustable operating frequency to 2MHz,

and high peak current drive capability with 20ns rise and fall

times.

Pinout

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A

(8 LD SOIC, MSOP)

TOP VIEW

Features

• 1A MOSFET gate driver

•90

μA start-up current, 125μA maximum

• 35ns propagation delay current sense to output

• Fast transient response with peak current mode control

• 30V operation

• 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

• 1.5MHz bandwidth error amplifier

• Tight tolerance voltage reference over line, load and

temperature

• ±3% current limit threshold

• Pb-free plus anneal available

and ELV, WEEE, RoHS

Compliant

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

PART NUMBER

RISING UVLO

MAX. DUTY CYCLE

ISL8840A

7.0

100%

ISL8841A

7.0

50%

ISL8842A

14.4V

100%

ISL8843A

8.4V

100%

ISL8844A

14.4V

50%

ISL8845A

8.4V

50%

COMP

FB

RTCT

VREF

VDD

OUT

GND

1

2

3

4

8

CS

7

6

5

Data Sheet

April 18, 2007

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, 2007. All Rights Reserved.

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