intersil ISL6594A, ISL6594B DATA SHEET

www.BDTIC.com/Intersil

ISL6594A, ISL6594B

Data Sheet December 3, 2007

Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features

The ISL6594A and ISL6594B are high frequency MOSFET drivers specifically designed to drive upper and lower power N-Channel MOSFETs in a synchronous rectified buck converter topology. These drivers combined with the ISL6592 Digital Multi-Phase Buck PWM controller and N-Channel MOSFETs form a complete core-voltage regulator solution for advanced microprocessors.

The ISL6594A drives the upper gate to 12V, while the lower gate can be independently driven over a range from 5V to 12V. The ISL6594B drives both upper and lower gates over a range of 5V to 12V. This drive-voltage provides the flexibility necessary to optimize applications involving trade-offs between gate charge and conduction losses.

An adaptive zero shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize the dead time. These products add an overvoltage protection feature operational before VCC exceeds its turn-on threshold, at which the PHASE node is connected to the gate of the low side MOSFET (LGATE). The output voltage of the converter is then limited by the threshold of the low side MOSFET , which provides some protection to the microprocessor if the upper MOSFET(s) is shorted during initial start-up.

These drivers also feature a three-state PWM input which, working together with Intersil’s multi-phase PWM controllers, prevents a negative transient on the output voltage when the output is shut down. This feature eliminates the Schottky diode that is used in some systems for protecting the load from reversed output voltage events.

FN9157.5

Features

• Dual MOSFET Drives for Synchronous Rectified Bridge

• Adjustable Gate Voltage (5V to 12V) for Optimal Efficiency

• 36V Internal Bootstrap Schottky Diode

• Bootstrap Capacitor Overcharging Prevention

• Supports High Switching Frequency (up to 2MHz)

- 3A Sinking Current Capability

- Fast Rise/Fall Times and Low Propagation Delays

• Three-State PWM Input for Output Stage Shutdown

• Three-State PWM Input Hysteresis for Applications with Power Sequencing Requirement

• Pre-POR Overvoltage Protection

• VCC Undervoltage Protection

• Expandable Bottom Copper Pad for Enhanced Heat Sinking

• Dual Flat No-Lead (DFN) Package

- Near Chip-Scale Package Footprint; Improves PCB

Efficiency and Thinner in Profile

• Pb-Free Available (RoHS Compliant)

Applications

• Core Regulators for Intel® and AMD® 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 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.

ISL6594A, ISL6594B

www.BDTIC.com/Intersil

Ordering Information

PART

NUMBER

ISL6594ACB* ISL65 94ACB 0 to +85 8 Ld SOIC M8.15 ISL6594ACBZ* (Note) 6594 ACBZ 0 to +85 8 Ld SOIC (Pb-free) M8.15 ISL6594ACR* 94AC 0 to +85 10 Ld 3x3 DFN L10.3x3 ISL6594ACRZ* (Note) 94AZ 0 to +85 10 Ld 3x3 DFN (Pb-free) L10.3x3 ISL6594BCB* ISL65 94BCB 0 to +85 8 Ld SOIC M8.15 ISL6594BCBZ* (Note) 6594 BCBZ 0 to +85 8 Ld SOIC (Pb-free) M8.15 ISL6594BCR* 94BC 0 to +85 10 Ld 3x3 DFN L10.3x3 ISL6594BCRZ* (Note) 94BZ 0 to +85 10 Ld 3x3 DFN (Pb-free) L10.3x3 *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) PA CKAGE

PKG.

DWG. #

Pinouts

ISL6594ACB, ISL6594BCB

UGATE

BOOT

PWM

GND

Block Diagram

(8 LD SOIC)

TOP VIEW

1 2 3 4

VCC

PWM

+5V

13.6k

6.4k

PHASE

PVCC VCC

LGATE

UVCC

PRE-POR OVP

FEATURES

POR/

CONTROL

LOGIC

ISL6594A AND ISL6594B

SHOOT-

THROUGH

PROTECTION

ISL6594ACR, ISL6594BCR

(10 LD 3x3 DFN)

TOP VIEW

UGATE

(LVCC)

BOOT

N/C

PWM

GND

1 2 3 4 5

BOOT

UGATE

PHASE

PVCC

LGATE

PHASE

PVCC

N/C

8 7

VCC LGATE

UVCC = VCC FOR ISL6594A UVCC = PVCC FOR ISL6594B

PAD

FOR DFN -DEVICES, THE PAD ON THE BOTTOM SIDE OF THE PACKAGE MUST BE SOLDERED TO THE CIRCUIT’S GROUND.

GND

FN9157.5

December 3, 2007

Typical Application - 4-Channel Converter Using ISL6592 and ISL6594A Gate Drivers

www.BDTIC.com/Intersil

+12V

+5V

+3.3V

VDD

ISL6592

VID4 VID3 VID2 VID1

FROM µP

TO µP

FAULT

OUTPUTS

C I/F

December 3, 2007

FN9157.5

BUS

VID0 VID5 LL0 LL1 OUTEN

VCC_PWRGD

RESET_N

FAULT1

FAULT2

SDA

SCL SADDR

V12_SEN

GND

OUT1

OUT2

ISEN1

OUT3 OUT4

ISEN2

OUT5

OUT6

ISEN3

OUT7

OUT8

ISEN4

OUT9

OUT10

ISEN5

OUT11

OUT12

ISEN6

TEMP_SEN

CAL_CUR_EN

CAL_CUR_SEN

VSENP VSENN

UGATE

BOOT

PWM

GND

UGATE

BOOT

PWM

GND

UGATE

BOOT

PWM

GND

UGATE

BOOT

PWM

GND

ISL6594

PHASE

LGATE

ISL6594

PHASE

LGATE

ISL6594

PHASE

LGATE

ISL6594

PHASE

LGATE

PVCC

VCC

PVCC

VCC

PVCC

VCC

PVCC

VCC

VOUT

RTN

RTHERM

ISL6594A, ISL6594B

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