ISL6440IA Datasheet

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ISL6440

Data Sheet

October 4, 2005

FN9040.2

300kHz Dual, 180掳 Out-of-Phase, Step-

Down PWM Controller

The ISL6440 is a high-performance, dual-output PWM

controller optimized for converting wall adapter, battery or

network intermediate bus DC input supplies into the system

supply voltages required for a wide variety of applications.

Each output is adjustable down to 0.8V. The two PWMs are

synchronized 180

o

out of phase reducing the RMS input

current and ripple voltage.

The ISL6440 incorporates several protection features. An

adjustable overcurrent protection circuit monitors the output

current by sensing the voltage drop across the lower

MOSFET. Hiccup mode overcurrent operation protects the

DC/DC components from damage during output

overload/short circuit conditions. Each PWM has an

independent logic-level shutdown input (SD1 and SD2).

A single PGOOD signal is issued when soft-start is complete

on both PWM controllers and their outputs are within 10% of

the set point. Thermal shutdown circuitry turns off the device

if the junction temperature exceeds +150掳C.

Features

鈥?Wide Input Supply Voltage Range

- 5.6V to 24V

- 4.5V to 5.6V

鈥?Two Independently Programmable Output Voltages

鈥?Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . 300kHz

鈥?Out of Phase PWM Controller Operation

- Reduces Required Input Capacitance and Power

Supply Induced Loads

鈥?No External Current Sense Resistor

- Uses Lower MOSFET鈥檚 r

DS(ON)

鈥?Programmable Soft-Start

鈥?Extensive Circuit Protection Functions

- PGOOD

- UVLO

- Overcurrent

- Overtemperature

- Independent Shutdown for Both PWMs

鈥?Excellent Dynamic Response

- Voltage Feed-Forward with Current Mode Control

鈥?Pb-Free Plus Anneal Available (RoHS Compliant)

Pinout

ISL6440 (QSOP)

TOP VIEW

1 LGATE2

2 BOOT2

3 UGATE2

4 PHASE2

5 ISEN2

6 PGOOD

7 VCC5

8 SD2

9 SS2

10 OCSET2

11 FB2

12 VIN

LGATE1 24

BOOT1 23

UGATE1 22

PHASE1 21

ISEN1 20

PGND 19

SD1 18

SS1 17

SGND 16

OCSET1 15

FB1 14

BIAS 13

Applications

鈥?Power Supplies with Two Outputs

鈥?xDSL Modems/Routers

鈥?DSP, ASIC, and FPGA Power Supplies

鈥?Set-Top Boxes

鈥?Dual Output Supplies for DSP, Memory, Logic,

碌P

Core

and I/O

鈥?Telecom Systems

Ordering Information

PART

NUMBER

ISL6440IA

ISL6440IAZ

(See Note)

PART

MARKING

ISL6440IA

ISL6440IAZ

TEMP.

RANGE

(掳C)

-40 to 85

-40 to 85

PACKAGE

PKG.

DWG. #

24 Ld QSOP M24.15

24 Ld QSOP M24.15

(Pb-free)

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.

Add 鈥?T鈥?or 鈥?TK鈥?suffix for tape and reel.

1

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

1-888-INTERSIL or 1-888-468-3774

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2005. All Rights Reserved

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

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