intersil ISL6620, ISL6620A DATA SHEET

ISL6620, ISL6620A

Data Sheet April 25, 2008

VR11.1 Compatible Synchronous Rectified Buck MOSFET Drivers

The ISL6620, ISL6620A is a high frequency MOSFET driver designed to drive upper and lower power N-Channel MOSFET s in a synchrono us rectified buck converter topology. The advanced PWM protocol of ISL6620, ISL6620A is specifically designed to work with Intersil VR11.1 controllers and combined with N-Channel MOSFETs, form a complete core-voltage regulator solution for advanced microprocessors. When ISL6620, ISL6620A detects a PSI Intersil VR11.1 controller, it activates Diode Emulation (DE) operation; otherwise, it operates in normal Continuous Conduction Mode (CCM) PWM mode.

The IC is biased by a single low voltage supply (5V), minimizing driving losses in high MOSFET gate capacitance and high switching frequency applications. Each driver is capable of driving a 3nF load with less than 10ns rise/fall time. Bootstrapping of the upper gate driver is implemented via an internal low forward drop diode, reducing implementatio n cost, complexity , and allowi ng the use of higher p erformance, cost effective N-Channel MOSFETs.

To further enhan ce light load efficiency, ISL6620, ISL6620A enables diode emulation operation during PSI allows Discontinuous Conduction Mode (DCM) by detecting when the inductor current reaches zero and subsequently turning off the low side MOSFET to prevent it from sinking current.

An advanced adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize dead time. The ISL6620, ISL6620A has a 20kΩ integrated high-side gate-to-source resistor to prevent self turn-on due to high input bus dV/dt.

protocol sent by an

mode. This

FN6494.0

Features

• Dual MOSFET Drives for Synchronous Rectified Bridge

• Advanced Adaptive Zero Shoot-Through Protection

• 36V Internal Bootstrap Schottky Diode

• Advanced PWM Protocol (Patent Pending) to Support PSI Mode, Diode Emulation, Three-State Operation

• Diode Emulation For Enhanced Light Load Efficiency

• Bootstrap Capacitor Overcharging Prevention

• Supports High Switching Frequency

- 4A Sinking Current Capability

- Fast Rise/Fall Times and Low Propagation Delays

• VCC Undervoltage Protection

• Enable Input and Power-On Reset

• Expandable Bottom Copper Pad for Enhanced Heat Sinking

• DFN Package:

- Compliant to JEDEC PUB95 MO-220

DFN - Dual Flat No Leads - Package Outline

- Near Chip Scale Package Footprint, which Improves

PCB Efficiency and has a Thinner Profile

• Pb-Free (RoHS Compliant)

Applications

• High Light Load Efficiency Voltage Regulators

• Core Regulators for Advanced Microprocessors

• High Current DC/DC Converters

• High Frequency and High Efficiency VRM and VRD

Related Literature

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

• Technical Brief TB417 “Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators” for Power Train Design, Layout Guidelines, and Feedback Compensation Design

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.

ISL6620, ISL6620A

Ordering Information

PART NUMBER

(Note)

ISL6620CBZ* 6620 CBZ 0 to +70 8 Ld SOIC M8.15 ISL6620CRZ* 620Z 0 to +70 10 Ld 3x3 DF N L10.3x3 ISL6620IBZ* 6620 IBZ -40 ISL6620IRZ* 620I -40 ISL6620ACBZ* 6620A CBZ 0 to +70 8 Ld SOIC M8.15 ISL6620ACRZ* 620A 0 to +70 10 Ld 3 x 3 DF N L10.3x3 ISL6620AIBZ* 6620A IBZ -40 ISL6620AIRZ* 20AI -40 *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is 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.

PART

MARKING

TEMP. RANGE

(°C)

to +85 8 Ld SOIC M8.15 to +85 10 Ld 3x 3 D FN L10.3x3

PACKAGE

(Pb-free) PKG. DWG. #

Pinouts

UGATE

BOOT

PWM

GND

Block Diagrams

ISL6620, ISL6620A

(8 LD SOIC)

TOP VIEW

1 2 3 4

VCC

PWM

VCC

4.25k

8 7 6 5

PHASE EN VCC LGATE

CONTROL

LOGIC

ISL6620, ISL6620A

BOOT

SHOOT-

THROUGH

PROTECTION

VCC

UGATE

BOOT

PWM

GND

ISL6620, ISL6620A

(10 LD 3x3 DFN)

TOP VIEW

1 2 3 4 5

PAD

BOOT

UGATE

PHASE

LGATE

9 8 7 6

PHASE

VCC

LGATE

*INTEGRATED 3Ω RESISTOR (R

) AVAILABLE ONLY IN ISL6620A

BOOT

GND

FN6494.0

April 25, 2008

Typical Application Circuit

ISL6620, ISL6620A

VTT

VR_RDY

VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0

PSI

VR_FAN VR_HOT

VIN

+5V

VDIFF VSEN

RGND

EN_VTT

EN_PWR

GND

IMON

TCOMP

+5V

COMP

ISL6334

OFS FS SS

VCC

+5V

DAC

REF

PWM1

ISEN1-

ISEN1+

PWM2

ISEN2-

ISEN2+

PWM3

ISEN3-

ISEN3+

PWM4

ISEN4-

ISEN4+

+5V

VCC

PWM

VCTRL

VCC

PWM

VCTRL

VCC

PWM

VCTRL

ISL6620,

ISL6620A

DRIVER

ISL6596 DRIVER

BOOT

UGATE PHASE

LGATE

GND

BOOT

UGATE PHASE

LGATE GND

BOOT

UGATE PHASE

LGATE

GND

BOOT

VIN

µP

LOAD

VIN

NTC

VCC

ISL6596 DRIVER

PWM

UGATE PHASE

LGATE

GND

FN6494.0

April 25, 2008

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