1

®

FN9110.4

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

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Copyright © Intersil Americas Inc. 2003-2005, 2007. All Rights Reserved.

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ISL6721

Flexible Single Ended Current Mode PWM

Controller

The ISL6721 is a low power, single-ended pulse width

modulating (PWM) current mode controller designed for a

wide range of DC/DC conversion applications including

boost, flyback, and isolated output configurations. Peak

current mode control effectively handles power transients

and provides inherent overcurrent protection. Other features

include a low power mode where the supply current drops to

less than 200µA during overvoltage and overcurrent

shutdown faults.

This advanced BiCMOS design features low operating

current, adjustable operating frequency up to 1MHz,

adjustable soft-start, and a bi-directional SYNC signal that

allows the oscillator to be locked to an external clock for

noise sensitive applications.

Features

• 1A MOSFET Gate Driver

•100

μA Startup Current

• Fast Transient Response with Peak Current Mode Control

• Adjustable Switching Frequency up to 1MHz

• Bi-Directional Synchronization

• Low Power Disable Mode

• Delayed Restart from OV and OC Shutdown Faults

• Adjustable Slope Compensation

• Adjustable Soft-start

• Adjustable Overcurrent Shutdown Delay

• Adjustable UV and OV Monitors

• Leading Edge Blanking

• Integrated Thermal Shutdown

• 1% Tolerance Voltage Reference

• Pb-free Plus Anneal Available (RoHS Compliant)

Applications

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems

• Isolated Buck and Flyback Regulators

• Boost Regulators

Pinout

ISL6721

(16 LD SOIC, TSSOP)

TOP VIEW

Ordering Information

PART

NUMBER

PART

MARKING

TEMP

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6721AB*

ISL6721AB

-40 to +105 16 Ld SOIC

M16.15

ISL6721ABZ*

(Note)

6721ABZ

-40 to +105 16 Ld SOIC

(Pb-Free)

M16.15

ISL6721AV*

ISL67 21AV

-40 to +105 16 Ld TSSOP

M16.173

ISL6721AVZ*

(Note)

ISL67 21AVZ -40 to +105 16 Ld TSSOP

(Pb-free)

M16.173

*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.

GATE

ISENSE

SYNC

SLOPE

UV

OV

RTCT

VC

PGND

VCC

VREF

LGND

SS

COMP

1

2

3

4

5

6

7

16

15

14

13

12

11

10

8

9

ISET

FB

Data Sheet

April 13, 2007