1

®

FN9091.7

ISL6605

Synchronous Rectified MOSFET Driver

The ISL6605 is a high frequency, MOSFET driver optimized

to drive two N-Channel power MOSFETs in a synchronous-

rectified buck converter topology. This driver combined with

an Intersil HIP63xx or ISL65xx Multi-Phase Buck PWM

controller forms a complete single-stage core-voltage

regulator solution with high efficiency performance at high

switching frequency for advanced microprocessors.

The IC is biased by a single low voltage supply (5V) and

minimizes low driver switching losses for high MOSFET gate

capacitance and high switching frequency applications.

Each driver is capable of driving a 3000pF load with an 8ns

propagation delay and less than 10ns transition time. This

product implements bootstrapping on the upper gate with an

internal bootstrap Schottky diode, reducing implementation

cost, complexity, and allowing the use of higher

performance, cost effective N-Channel MOSFETs. Adaptive

shoot-through protection is integrated to prevent both

MOSFETs from conducting simultaneously.

The ISL6605 features 4A typical sink current for the lower

gate driver, which is capable of holding the lower MOSFET

gate during the Phase node rising edge to prevent shoot-

through power loss caused by the high dv/dt of the Phase

node.

The ISL6605 also features a Three-State PWM input that,

working together with Intersil multi-phase PWM controllers,

will prevent a negative transient on the output voltage when

the output is being shut down. This feature eliminates the

Schottky diode that is usually seen in a microprocessor

power system for protecting the microprocessor from

reversed-output-voltage damage.

Features

• Drives Two N-Channel MOSFETs

• Adaptive Shoot-Through Protection

•0.4

Ω On-Resistance and 4A Sink Current Capability

• Supports High Switching Frequency

- Fast Output Rise and Fall Time

- Ultra Low Propagation Delay 8ns

• Three-State PWM Input for Power Stage Shutdown

• Internal Bootstrap Schottky Diode

• Low Bias Supply Current (5V, 30µA)

• Enable Input

• QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat

No Leads-Product Outline.

- Near Chip-Scale Package Footprint; Improves PCB

Efficiency and Thinner in Profile.

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Core Voltage Supplies for Intel® and AMD®

Microprocessors

• High Frequency Low Profile DC/DC Converters

• High Current Low Voltage DC/DC Converters

• Synchronous Rectification for Isolated Power Supplies

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)”

Pinouts

ISL6605

(8 LD SOIC)

TOP VIEW

ISL6605

(8 LD QFN)

TOP VIEW

UGATE

BOOT

PWM

GND

1

2

3

4

8

7

6

5

PHASE

EN

VCC

LGATE

BOOT

EN

VCC

PWM

7

8

4

3

1

2

6

5

6

Data Sheet

May 9, 2006

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

1-888-INTERSIL or 1-888-468-3774 Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright © Intersil Americas Inc. 2002-2006. All Rights Reserved

Intel® is a registered trademark of Intel Corporation. AMD® is a registered trademark of Advanced Micro Devices, Inc.

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

FOR

NEW

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GNS,

INTE

RSIL

RECO

MME

NDS

DRO

P-IN

ENHA

NCED

PROD

UCT

- ISL6

609