1

®

FN9007.7

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

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ISL6401

Synchronizing Current Mode PWM for

Subscriber Line Interface Circuits (SLICs)

The ISL6401 adjustable frequency, low power, pulse width

modulating (PWM) current mode controller is designed for a

wide range of DC/DC conversion applications including

boost, flyback, and isolated output configurations. The

device is optimized to provide a high performance, low-cost

solution for Ringing SLIC (RSLIC) ring and talk power

supplies. An integrated inverter allows for easy design of

negative voltage regulation circuits with a minimal amount of

external components. Internal soft-start minimizes start-up

stress without any external components. Peak current mode

control effectively handles Ring trip transients and provides

inherent overcurrent protection.

This advanced BiCMOS design features low operating

current, adjustable operating output frequency (50kHz to

600kHz), internal soft-start and a SYNC input that allows the

oscillator to be locked to an external clock for noise sensitive

applications. DC/DC conversion efficiency is optimized by

use of a low current sense voltage. A logic level shutdown

input is included, which reduces supply current to 55

µA in

the shutdown mode.

Features

• Positive and Negative Output Regulation

• Starting Supply Current . . . . . . . . . . . . . . . . . 100

µA (typ.)

• Quiescent Current . . . . . . . . . . . . . . . . . . . . . . 55

µA (typ.)

• Output Frequency Range. . . . . . . . . . . . 50kHz to 600kHz

• External Clock Synchronization

• Fast Transient Response with Peak Current Mode Control

• Internal Soft-Start

• Drives N-Channel MOSFET

• Logic Level Shutdown

• Leading Edge Blanking

• 1% Tolerance Voltage Reference Over Line and

Temperature

• Pb-Free Available (RoHS Compliant)

Applications

• VoIP/VoDSL Ringer and Off-Hook Voltage Generators

• Multi-Output Flyback Supplies

• Cable and DSL Modems

• Set-Top Boxes

• Wireless Local Loops

• LMDH and FTTH Supplies

• Boost Regulators

•Routers

Pinouts

ISL6401 (SOIC)

TOP VIEW

ISL6401 (QFN)

TOP VIEW

SD

SYNC

CT

COMP

FB

NFB OUT

NFB IN

GATE

PGND

GND

CS

NC

1

2

3

4

5

6

7

14

13

12

11

10

9

8

SYNC

CT

COMP

FB

PGND

PGND

GND

CS

1

3

4

15

16

14

13

2

12

10

9

11

6

57

8

Ordering Information

PART NUMBER

TEMP.

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6401CB

-40 to 85

14 Ld SOIC

M14.15

ISL6401CBZ (Note)

-40 to 85

14 Ld SOIC (Pb-free)

M14.15

ISL6401CR

-40 to 85

16 Ld 4x4 QFN

L16.4x4

ISL6401CRZ (Note)

-40 to 85

16 Ld 4x4 QFN (Pb-free) L16.4x4

Add -T suffix for tape and reel packaging.

NOTES:

1. The parts with suffix ‘C’ are being tested to the industrial temperature

grade. This has been updated in the table above. The IB and IR parts are

being discontinued. The affected parts are: ISL6401IB, ISL6401IBZ,

ISL6401IB-T, ISL6401IBZ-T, ISL6401IR, ISL6401IRZ, ISL6401IR-T,

ISL6401IRZ-T.

2. Intersil Pb-free 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.

Data Sheet

April 13, 2005