1

®

FN9276.2

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

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ISL6327

Enhanced 6-Phase PWM Controller with

8-Bit VID Code and Differential Inductor

DCR or Resistor Current Sensing

The ISL6327 controls microprocessor core voltage regulation

by driving up to 6 synchronous-rectified buck channels in

parallel. Multiphase buck converter architecture uses

interleaved timing to multiply channel ripple frequency and

reduce input and output ripple currents. Lower ripple results in

fewer components, lower component cost, reduced power

dissipation, and smaller implementation area.

Microprocessor loads can generate load transients with

extremely fast edge rates. The ISL6327 utilizes Intersil’s

proprietary Active Pulse Positioning (APP) and Adaptive

Phase Alignment (APA) modulation scheme to achieve the

extremely fast transient response with fewer output

capacitors.

Today’s microprocessors require a tightly regulated output

voltage position versus load current (droop). The ISL6327

senses the output current continuously by utilizing patented

techniques to measure the voltage across the dedicated

current sense resistor or the DCR of the output inductor.

Current sensing provides the needed signals for precision

droop, channel-current balancing, and overcurrent

protection. A programmable integrated temperature

compensation function is implemented to effectively

compensate the temperature variation of the current sense

element. The current limit function provides the overcurrent

protection for the individual phase.

A unity gain, differential amplifier is provided for remote

voltage sensing. Any potential difference between remote

and local grounds can be completely eliminated using the

remote-sense amplifier. Eliminating ground differences

improves regulation and protection accuracy. The threshold-

sensitive enable input is available to accurately coordinate

the start up of the ISL6327 with any other voltage rail.

Dynamic-VID™ technology allows seamless on-the-fly VID

changes. The offset pin allows accurate voltage offset

settings that are independent of VID setting.

Features

• Proprietary Active Pulse Positioning and Adaptive Phase

Alignment Modulation Scheme

• Precision Multiphase Core Voltage Regulation

- Differential Remote Voltage Sensing

-

±0.5% System Accuracy Over Life, Load, Line and

Temperature

- Adjustable Precision Reference-Voltage Offset

• Precision Resistor or DCR Current Sensing

- Accurate Load-Line Programming

- Accurate Channel-Current Balancing

- Differential Current Sense

• Microprocessor Voltage Identification Input

- Dynamic VID™ Technology

- 8-Bit VID Input with Selectable VR11 code and

Extended VR10 Code at 6.25mV Per Bit

- 0.5V to 1.600V Operation Range

• Thermal Monitoring

• Integrated Programmable Temperature Compensation

• Overcurrent Protection and Channel Current Limit

• Overvoltage Protection with OVP Output Indication

• 2, 3, 4, 5 or 6 Phase Operation

• Adjustable Switching Frequency up to 1MHz Per Phase

• Package Option

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

Flat No Leads - Product Outline

- QFN Near Chip Scale Package Footprint; Improves

PCB Efficiency, Thinner in Profile

• Pb-Free Plus Anneal Available (RoHS Compliant)

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

TEMP.

(°C)

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL6327CRZ ISL6327CRZ

0 to70

48 Ld 7x7 QFN L48.7x7

ISL6327IRZ

ISL6327IRZ

-40 to 85 48 Ld 7x7 QFN L48.7x7

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%

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.

Data Sheet

December 20, 2006