1

FN9124.11

ISL6840, ISL6841, ISL6842,

ISL6843, ISL6844, ISL6845

Improved Industry Standard Single-Ended

Current Mode PWM Controller

The ISL6840, ISL6841, 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 overcurrent 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, 60µA start-up current, adjustable

operating frequency to 2MHz, and high peak current drive

capability with 20ns rise and fall times.

Pinouts

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

(8 LD SOIC, MSOP)

TOP VIEW

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

(8 LD DFN)

TOP VIEW

Features

• 1A MOSFET Gate Driver

• 60µA Start-up Current, 100µA Maximum

• 25ns 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

• Pb-Free Available (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 (V) MAX. DUTY CYCLE (%)

ISL6840

7.0

100

ISL6841

7.0

50

ISL6842

14.4

100

ISL6843

8.4

100

ISL6844

14.4

50

ISL6845

8.4

50

COMP

FB

RTCT

VREF

VDD

OUT

GND

1

2

3

4

8

CS

7

6

5

2

3

4

1

7

6

5

8

COMP

FB

CS

RTCT

VREF

VDD

OUT

GND

Data Sheet

February 23, 2012

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. 2004, 2005, 2007, 2008, 2012. All Rights Reserved

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

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