1

®

FN9289.1

ISL6312

Four-Phase Buck PWM Controller with

Integrated MOSFET Drivers for Intel VR10,

VR11, and AMD Applications

The ISL6312 four-phase PWM control IC provides a

precision voltage regulation system for advanced

microprocessors. The integration of power MOSFET drivers

into the controller IC marks a departure from the separate

PWM controller and driver configuration of previous

multiphase product families. By reducing the number of

external parts, this integration is optimized for a cost and

space saving power management solution.

One outstanding feature of this controller IC is its

multi-processor compatibility, allowing it to work with both Intel

and AMD microprocessors. Included are programmable VID

codes for Intel VR10, VR11, as well as AMD DAC tables. A

unity gain, differential amplifier is provided for remote voltage

sensing, compensating for any potential difference between

remote and local grounds. The output voltage can also be

positively or negatively offset through the use of a single

external resistor.

The ISL6312 also includes advanced control loop features

for optimal transient response to load apply and removal.

One of these features is highly accurate, fully differential,

continuous DCR current sensing for load line programming

and channel current balance. Active Pulse Positioning (APP)

modulation is another unique feature, allowing for quicker

initial response to high di/dt load transients.

This controller also allows the user the flexibility to choose

between PHASE detect or LGATE detect adaptive dead time

schemes. This ability allows the ISL6312 to be used in a

multitude of applications where either scheme is required.

Protection features of this controller IC include a set of

sophisticated overvoltage, undervoltage, and overcurrent

protection. Furthermore, the ISL6312 includes protection

against an open circuit on the remote sensing inputs.

Combined, these features provide advanced protection for the

microprocessor and power system.

Features

• Integrated Multiphase Power Conversion

- 2 or 3-Phase Operation with Internal Drivers

- 4-Phase Operation with External PWM Driver Signal

• Precision Core Voltage Regulation

- Differential Remote Voltage Sensing

-

±0.5% System Accuracy Over Temperature

- Adjustable Reference-Voltage Offset

• Optimal Transient Response

- Active Pulse Positioning (APP) Modulation

- Adaptive Phase Alignment (APA)

• Fully Differential, Continuous DCR Current Sensing

- Accurate Load Line Programming

- Precision Channel Current Balancing

• User Selectable Adaptive Dead Time Scheme

- PHASE Detect or LGATE Detect for Application

Flexibility

• Variable Gate Drive Bias: 5V to 12V

• Multi-Processor Compatible

- Intel VR10 and VR11 Modes of Operation

- AMD Mode of Operation

• Microprocessor Voltage Identification Inputs

-8-bit DAC

- Selectable between Intel’s Extended VR10, VR11, AMD

5-bit, and AMD 6-bit DAC Tables

- Dynamic VID Technology

• Overcurrent Protection

• Multi-Tiered Overvoltage Protection

• Digital Soft-Start

• Selectable Operation Frequency up to 1.5MHz Per Phase

• Pb-Free Plus Anneal Available (RoHS Compliant)

Ordering Information

PART

NUMBER*

(Note)

PART

MARKING

TEMP.

(°C)

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL6312CRZ ISL6312CRZ

0 to +70 48 Ld 7x7 QFN

L48.7x7

ISL6312IRZ

ISL6312IRZ

-40 to +85 48 Ld 7x7 QFN

L48.7x7

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.

*Add “-T” suffix for tape and reel.

Data Sheet

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.

August 21, 2006