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廬

ISL6444

Data Sheet

May 2002

FN9069.1

Dual PWM Controller with DDR Memory

Option for Gateway Applications

The ISL6444 PWM controller provides high efficiency and

regulation for two output voltages adjustable in the range from

0.9V to 5.5V that are required to power I/O, chip-sets, and

memory banks in high-performance notebook computers,

PDAs, and Internet appliances.

Synchronous rectification and hysteretic operation at light

loads contribute to a high efficiency over a wide range of

loads. The hysteretic mode of operation can be disabled

separately on each PWM converter if continuous conduction

operation is desired for all load levels. Efficiency is even

further enhanced by using MOSFET鈥檚 R

DS(ON)

as a current

sense component.

Feed-forward ramp modulation, current mode control

scheme, and internal feed-back compensation provide fast

response to load transients. Out-of-phase operation with a

180

o

phase shift reduces the input current ripple.

The controller can be transformed in a complete DDR

memory power supply solution by activating a DDR pin. In

DDR mode of operation one of the channels tracks the

output voltage of another channel and provides output

current sink and source capability鈥揻eatures essential for

proper powering of DDR chips. The buffered reference

voltage required by this type of memory is also provided.

The ISL6444 monitors the output voltages. Each PWM

controller generates a PGOOD (power good) signal when

the soft-start is completed and the output is within 鹵10% of

the set point.

A built-in overvoltage protection prevents output voltage

from going above 115% of the set point. Normal operation

automatically restores when the overvoltage conditions go

away. Undervoltage protection latches the chip off when

either output drops below 75% of its set value after the soft-

start sequence for this output is completed. An adjustable

overcurrent function monitors the output current by sensing

the voltage drop across the lower MOSFET. If precision

current-sensing is required, an external current-sense

resistor may optionally be used.

The IC comes in a 28 lead SSOP package.

Features

鈥?Provides regulated output voltage in the range 0.9V鈥?.5V

- High efficiency over wide load range

- Synchronous buck converter with hysteretic operation at

light load

鈥?Complete DDR memory power solution

- VTT tracks VDDQ/2

- VDDQ/2 buffered reference output

鈥?No current-sense resistor required

- Uses MOSFET鈥檚 R

DS(ON)

- Optional current-sense resistor for precision overcurrent

鈥?Undervoltage lock-out on VCC pin

鈥?Dual mode operation

- Operates directly from battery 5.0-24V input

- Operates from 3.3V or 5V system rail

鈥?Excellent dynamic response

- Combined voltage feed-forward and current mode

control

鈥?Power-good signal for each channel

鈥?300kHz switching frequency

- Out-of-phase operation for reduced input ripple

- In-phase operation in DDR mode for reduced channel

interference

- Out-of-phase operation with 90

o

phase shift for two-

stage conversion in DDR mode

Applications

鈥?Residential and Enterprise Gateways

鈥?DSL Modems

鈥?Routers and Switchers

Pinout

ISL6444 (SSOP-28)

GND

LGATE1

PGND1

PHASE1

UGATE1

BOOT1

ISEN1

EN1

VOUT1

VSEN1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

VCC

LGATE2

PGND2

PHASE2

UGATE2

BOOT2

ISEN2

EN2

VOUT2

VSEN2

OCSET2

SOFT2

PG2/REF

PG1

Ordering Information

PART NUMBER

ISL6444CA

ISL6444CA-T

TEMP. (

o

C)

-10 to 85

-10 to 85

PACKAGE

28 Ld SSOP

28 Ld SSOP

Taped and

Reeled

PKG. NO.

M28.15

M28.15

OCSET1

SOFT1

DDR

VIN

1

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

1-888-INTERSIL or 321-724-7143

|

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

Copyright 漏 Intersil Americas Inc. 2002. All Rights Reserved

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