1

TM

FN9029

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Copyright © Intersil Americas Inc. 2001, All Rights Reserved

ISL6235

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

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.

Pinout

ISL6235 (SSOP)

TOP VIEW

Features

• PWM Only Mode for Reduced Noise at Light Loads

• Provides Five Regulated Voltages

- +5V ALWAYS

- +3.3V ALWAYS

-+5V Main

- +3.3V Main

-+12V

• High Efficiency Over Wide Line and Load Range

- Synchronous Buck Converters on Main Outputs

• No Current-Sense Resistor Required

- Optional Current-Sense Resistor for More Precision

• Operates Directly From Battery 5.6 to 24V Input

• Input Undervoltage Lock-Out (UVLO)

• Excellent Dynamic Response

- Voltage Feed-Forward and Current-Mode Control

• Monitors Output Voltages

• Synchronous Converters Operate Out of Phase

• Separate Shut-Down Pins for Advanced Configuration and

Power Interface (ACPI) Compatibility

• 300kHz Fixed Switching Frequency on Main Outputs

• Thermal Shut-Down Protection

Applications

• Mobile PCs

• Hand-Held Portable Instruments

•LCD PCs

• Cable Modems

• DSL Modems

•Set Top Box

Related Literature

• Application Note AN9915 (IPM6220)

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

ISL6235CA

-10 to 85

24 Ld SSOP

M24.15

IPM6220EVAL1

Evaluation Board

VBATT

3.3V ALWAYS

BOOT2

UGATE2

VSEN2

SDWN2

PGOOD

BOOT1

LGATE1

ISEN1

PHASE1

GND

GATE3

SDWNALL

UGATE1

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

PGND2

PHASE2

ISEN2

VSEN1

VSEN3

5V ALWAYS

LGATE2

PGND1

SDWN1

Data Sheet

June 2001

NOT

REC

OMM

END

ED F

OR

NEW

DES

IGN

S

REC

OMM

END

ED R

EPL

ACE

MEN

T

ISL6

232

(Ava

ilabl

e Fe

b. 20

04)