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廬

ISL6226

Data Sheet

August 2002

FN9078.1

Advanced PWM and Linear Power

Controller for Portable Applications

The ISL6226 provides power control and protection for two

user selected output voltages required in high-performance

notebook PC applications. The IC integrates a fixed,

selectable frequency pulse-width-modulation (PWM)

controller and a 3A LDO linear regulator controller with

monitoring and protection circuitry in a single 24 lead SSOP

package.

The PWM controller regulates the battery input voltage to a

user selected output voltage. Synchronous converter and

hysteretic operation at light loads contribute to a high

efficiency over a wide range of input voltage and load

variation. Efficiency can be 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 internal linear regulator controller provides a user

selected high current output from an unregulated input with

user selected current limit.

Features

鈥?Provides Two Regulated Voltages

- Linear Regulator, User Selected, Current Limited

- High Efficiency PWM Over Wide Line and Load Range

- Synchronous Buck Converter on PWM Output

- Hysteretic Operation at Light Load

鈥?Dual Mode Operation:

- Directly From Battery Input, V

IN

, of 5.6V to 24V or from

V

CC

of 5V

鈥?PWM Output Adjustable From 0.9V to 0.93*V

IN

鈥?Low Drop-Out (LDO) Linear Regulator Operates from

Vout+0.5V to 24V

鈥?LDO Output Adjustable

- From 0.8V to 3.8V at 0A to 3A for NPN Transistor

- From 0.8V to 3.0V at 0A to 3A for N-MOSFET

鈥?300/600kHz Switching Frequency Selectable

鈥?Forced PWM Mode Control Option

鈥?No Current-Sense Resistor Required on PWM Output

- Uses MOSFET鈥檚 r

DS(ON)

- Optional Current-Sense Resistor for More Precision

鈥?Separate Soft-Start For Both PWM and LDO

Ordering Information

PART

NUMBER

ISL6226CA

ISL6226EVAL1

TEMP. RANGE

(

o

C)

-10 to 85

Evaluation Board

PACKAGE

24 Ld SSOP

PKG. NO.

M24.15

鈥?Separate Enable Pins for both PWM and LDO for

Advanced Configuration and Power Interface (ACPI)

Compatibility

鈥?Input Under voltage Lock-Out (UVLO) Protection

鈥?Excellent Dynamic Response

Pinout

ISL6226 (SSOP)

TOP VIEW

VIN 1

PGOODL 2

PWMEN 3

OCSET 4

LINEN 5

VCC 6

LINDR 7

LINCS1 8

LINCS2 9

SSLIN 10

LINVS 11

GND 12

24 VOUT

23 VSEN

22 FPWM

21 PGOODP

20 ISEN

19 BOOT

18 UGATE

17 PHASE

16 SSPWM

15 PVCC

14

LGATE

13

PGND

- Input Voltage Feed-Forward and Current-Mode Control

鈥?Monitors Output Voltages and Provides PGOOD Status

鈥?Thermal Shut-Down Protection

Applications

鈥?Mobile PCs

鈥?Hand-Held Portable Instruments

鈥?Other Devices and Appliances With up to 24V Input

Related Literature

鈥?AN1013

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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