1

®

FN9097.4

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

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ISL6556B

Optimized Multi-Phase PWM Controller

with 6-Bit DAC and Programmable Internal

Temperature Compensation for VR10.X

Application

The ISL6556B controls microprocessor core voltage

regulation by driving up to 4 synchronous-rectified buck

channels in parallel. Multi-phase buck converter architecture

uses interleaved timing to multiply channel ripple frequency

and reduce input and output ripple currents.

phase for adaptive voltage positioning (droop), channel-

current balancing, and overcurrent protection. To ensure the

accuracy of droop, a programmable internal temperature

compensation function is implemented to nullify the effect of

A unity gain, differential amplifier is provided for remote voltage

sensing. Any potential difference between remote and local

grounds can be eliminated using the remote-sense amplifier.

The precision threshold-sensitive enable input is available to

accurately coordinate the startup of the ISL6556B with Intersil

MOSFET driver IC. Dynamic-VID™ technology allows

seamless on-the-fly VID changes. The offset pin allows accurate

voltage offset settings that are independent of VID setting. The

ISL6556B uses 5V bias and has a built-in shunt regulator to

allow 12V bias using only a small external limiting resistor.

Features

• Precision Multi-Phase Core Voltage Regulation

- Differential Remote Voltage Sensing

-

±0.5% System Accuracy Over Temperature and Life

- Adjustable Reference-Voltage Offset

- Integrated Programmable Temperature Compensation

- Accurate Load-Line Programming

- Accurate Channel-Current Balancing

- Low-Cost, Lossless Current Sensing

• Internal Shunt Regulator for 5V or 12V Biasing

• Microprocessor Voltage Identification Input

- Dynamic VID™ Technology

- 6-Bit VID Input

- 0.8375V to 1.600V in 12.5mV Steps

• Threshold Enable Function for Precision Sequencing

• Overcurrent Protection

• Overvoltage Protection

- No Additional External Components Needed

- OVP Pin to drive optional Crowbar Device

• 2, 3, or 4 Phase Operation up to 1.5MHz per Phase

• QFN 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 Available (RoHS Compliant)

Ordering Information

PART NUMBER TEMP. (°C)

PACKAGE

PKG. DWG. #

ISL6556BCB*

0 to 70

28 Ld SOIC

M28.3

ISL6556BCBZ*

(Note)

0 to 70

28 Ld SOIC (Pb-free) M28.3

ISL6556BCBZA

-T (Note)

0 to 70

28 Ld SOIC Tape and

Reel (Pb-free)

M28.3

ISL6556BCR*

0 to 70

32 Ld 5x5B QFN

L32.5x5B

ISL6556BCRZ*

(Note)

0 to 70

32 Ld 5x5B QFN

(Pb-free)

L32.5x5B

* Add “-T” suffix for tape and reel.

NOTE: Intersil Pb-free 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 28, 2004