intersil ISL6605 DATA SHEET

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Data Sheet May 9, 2006

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ISL6605

FN9091.7

Synchronous Rectified MOSFET Driver

The ISL6605 is a high frequency, MOSFET driver optimized
to drive two N-Channel power MOSFETs in a synchronous­rectified 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 shoot­through power loss caused by the high dv/dt of the Phase
node.

Features

• Drives Two N-Channel MOSFETs

• Adaptive Shoot-Through Protection

•0.4Ω 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

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.

Pinouts

ISL6605

(8 LD SOIC)

TOP VIEW

UGATE

BOOT

PWM

GND

1

2

3

4

8

7

6

5

PHASE

EN

VCC

LGATE

Related Literature

• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”

ISL6605

(8 LD QFN)

TOP VIEW

UGATE

PHASE

7

8

BOOT

PWM

1

2

43

GND

LGATE

EN

6

6

5

VCC

1

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

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.

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

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

ISL6605

Ordering Information

PART

NUMBER*

ISL6605CB ISL6605CB 0 to 70 8 Ld SOIC M8.15

ISL6605CBZ
(Note)

ISL6605CBZA
(Note)

ISL6605CR 605C 0 to 70 8 Ld 3x3 QFN L8.3x3

ISL6605CRZ
(Note)

ISL6605CRZA
(Note)

ISL6605IB ISL6605IB -40 to 85 8 Ld SOIC M8.15

ISL6605IBZ
(Note)

PART

MARKING

TEMP.

RANGE (°C) PACKAGE

ISL6605CBZ 0 to 70 8 Ld SOIC

(Pb-free)

ISL6605CBZ 0 to 70 8 Ld SOIC

(Pb-free)

05CZ 0 to 70 8 Ld 3x3 QFN

(Pb-free)

05CZ 0 to 70 8 Ld 3x3 QFN

(Pb-free)

6605IBZ -40 to 85 8 Ld SOIC

(Pb-free)

PKG.

DWG. #

M8.15

M8.15

L8.3x3

L8.3x3

M8.15

Block Diagram

ISL6605

Ordering Information

PART

NUMBER*

ISL6605IBZA
(Note)

ISL6605IR 605I -40 to 85 8 Ld 3x3 QFN L8.3x3

ISL6605IRZ
(Note)

ISL6605IRZA
(Note)

ISL6558EVAL2 Evaluation Platform (ISL6558IR+ISL6605IR)

*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100% matt e
tin plate termination finish, which are RoHS compliant and comp atible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temper ature s that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

ti

PART

MARKING

TEMP.

RANGE (°C) PACKAGE

6605IBZ -40 to 85 8 Ld SOIC

(Pb-free)

05IZ -40 to 85 8 Ld 3x3 QFN

(Pb-free)

05IZ -40 to 85 8 Ld 3x3 QFN

(Pb-free)

PKG.

DWG. #

M8.15

L8.3x3

L8.3x3

VCC

EN

PWM

VCC

20K

20K

CONTROL

LOGIC

SHOOT-

THROUGH

PROTECTION

BOOT

UGATE

PHASE

VCC

LGATE

GND

2

FN9091.7

May 9, 2006

ISL6605

Typical Application - Multi-Phase Converter Using ISL6605 Gate Drivers

V

IN

+5V

+5V

PGOOD

VID

(OPTIONAL)

+5V

FB

VCC

VSEN

PWM

CONTROL

(HIP63XX

or ISL65XX)

COMP

PWM1

PWM2

ISEN1

ISEN2

VCC

EN

PWM

499K*

+5V

ISL6605

BOOT

UGATE

PHASE

LGATE

V

IN

+V

CORE

VCC

FS/EN

GND

* 499K IS USED TO PULL DOWN THE PWM INPUT TO PREVENT THE PWM FROM FALSE TRIGGERING UGATE DURING STARTUP.

EN

PWM

499K*

BOOT

UGATE

PHASE

ISL6605

LGATE

3

FN9091.7

May 9, 2006