1

®

FN6348.0

ISL6268

High-Performance Notebook PWM

Controller

The ISL6268 IC is a Single-Phase Synchronous-Buck PWM

technology that delivers truly superior dynamic response to

input voltage and output load transients. Integrated

MOSFET drivers and bootstrap diode result in fewer

components and smaller implementation area.

fixed-frequency PWM and hysteretic PWM while eliminating

innovative modulator that synthesizes an AC ripple voltage

sets the steady-state PWM frequency. Both edges of the

PWM can be modulated in response to input voltage

transients and output load transients, much faster than

conventional fixed-frequency PWM controllers. Unlike a

conventional hysteretic converter, the ISL6268 has an error

amplifier that provides ±1% voltage regulation at the FB pin.

The ISL6268 has a 1.5ms digital soft-start and can be

started into a pre-biased output voltage. A resistor divider is

used to program the output voltage setpoint. The ISL6268

normally operates in continuous-conduction-mode (CCM),

automatically entering diode-emulation-mode (DEM) at low

load for optimum efficiency. In CCM the converter operates

as a synchronous rectifier. In DEM the low-side MOSFET

stays off, blocking negative current flow from the output

inductor.

Pinout

ISL6268 (16 LD SSOP)

TOP VIEW

Features

• Fast transient response

• ±1% regulation accuracy: -10°C to +100°C

• Wide input voltage range: +7.0V to +25.0V

• Output voltage range: +0.6V to +3.3V

• Wide output load range: 0A to 25A

• Diode emulation mode for increased light load efficiency

• Programmable PWM frequency: 200kHz to 600kHz

• Pre-biased output start-up capability

• Integrated MOSFET drivers and bootstrap diode

• Internal digital soft-start

• Power good monitor

• Fault protection

- Undervoltage protection

- Soft crowbar overvoltage protection

- Over-temperature protection

- Fault identification by PGOOD pull-down resistance

• Pb-free plus anneal available (RoHS compliant)

Applications

• PCI express graphical processing unit

• Auxiliary power rail

•VRM

• Network adapter

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

PHASE

PGOOD

VIN

VCC

EN

COMP

GND

FB

UG

PVCC

LG

PGND

ISEN

VO

FSET

BOOT

Ordering Information

PART

NUMBER

PART

MARKING TEMP (°C)

PACKAGE

PKG.

DWG. #

ISL6268CAZ

(Note)

6268CAZ

-10 to +100 16 Ld QSOP

(Pb-free)

M16.15A

ISL6268CAZ-T

(Note)

6268CAZ

16 Ld QSOP Tape and

Reel (Pb-free)

M16.15A

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.

Data Sheet

August 22, 2006

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

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

Copyright Intersil Americas Inc. 2006. All Rights Reserved

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