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I GNS

D ES

TM

EW

O R N EM EN T

E D F PLA C

EN D

E

04)

OMM NDED R Feb. 20

REC

Data Sheet

le

E

NOT ECOMM (Availab

R

232

I S L6

ISL6235

June 2001

FN9029

Advanced Triple PWM Only Mode and

Dual Linear Power Controller for Portable

Applications

The ISL6235 provides a highly integrated power control and

protection solution for five output voltages required in high-

performance notebook PC applications. The IC integrates

three fixed frequency pulse-width-modulation (PWM)

controllers and two linear regulators along with monitoring

and protection circuitry into a single 24 lead SSOP package.

The two PWM controllers that regulate the system main 5V

and 3.3V voltages are implemented with synchronous-

rectified buck converters. Synchronous rectification insures

high efficiency over a wide range of input voltage and load

variation. Efficiency is further enhanced by using the lower

MOSFET鈥檚 r

DS(ON)

as the current sense element. Input

voltage feed-forward ramp modulation, current-mode

control, and internal feed-back compensation provide fast

and stable handling of input voltage load transients

encountered in advanced portable computer chip sets.

The third PWM controller is a boost converter that regulates

a resistor selectable output voltage of nominally 12V.

Two internal linear regulators provide +5V ALWAYS and

+3.3V ALWAYS low current outputs required by the

notebook system controller.

Features

鈥?PWM Only Mode for Reduced Noise at Light Loads

鈥?Provides Five Regulated Voltages

- +5V ALWAYS

- +3.3V ALWAYS

- +5V Main

- +3.3V Main

- +12V

鈥?High Efficiency Over Wide Line and Load Range

- Synchronous Buck Converters on Main Outputs

鈥?No Current-Sense Resistor Required

- Uses MOSFET鈥檚 r

DS(ON)

- Optional Current-Sense Resistor for More Precision

鈥?Operates Directly From Battery 5.6 to 24V Input

鈥?Input Undervoltage Lock-Out (UVLO)

鈥?Excellent Dynamic Response

- Voltage Feed-Forward and Current-Mode Control

鈥?Monitors Output Voltages

鈥?Synchronous Converters Operate Out of Phase

鈥?Separate Shut-Down Pins for Advanced Configuration and

Power Interface (ACPI) Compatibility

鈥?300kHz Fixed Switching Frequency on Main Outputs

Ordering Information

PART NUMBER

ISL6235CA

IPM6220EVAL1

TEMP.

RANGE (

o

C)

-10 to 85

PACKAGE

24 Ld SSOP

PKG.

NO.

M24.15

鈥?Thermal Shut-Down Protection

Applications

鈥?Mobile PCs

鈥?Hand-Held Portable Instruments

Evaluation Board

Pinout

ISL6235 (SSOP)

TOP VIEW

VBATT 1

3.3V ALWAYS 2

BOOT2 3

UGATE2 4

PHASE2 5

5V ALWAYS 6

LGATE2 7

PGND2 8

ISEN2 9

VSEN2 10

SDWN2 11

PGOOD 12

24 BOOT1

23 UGATE1

22 PHASE1

21 ISEN1

20 LGATE1

19 PGND1

18 VSEN1

17 SDWN1

16 GATE3

15 VSEN3

14 GND

13 SDWNALL

鈥?LCD PCs

鈥?Cable Modems

鈥?DSL Modems

鈥?Set Top Box

Related Literature

鈥?Application Note AN9915 (IPM6220)

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 trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2001, All Rights Reserved

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