1

®

FN9200.2

ISL6566A

Three-Phase Buck PWM Controller with

Two Integrated MOSFET Drivers and One

External Driver Signal

The ISL6566A three-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 multi-

phase product families. By reducing the number of external

parts, this integration is optimized for a cost and space

saving power management solution.

Outstanding features of this controller IC include programmable

VID codes compatible with Intel VRM9, VRM10, as well as

AMD Hammer microprocessors. 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.

A unique feature of the ISL6566A is the combined use of

positioning (droop) and overcurrent protection are

accomplished through continuous inductor DCR current

channel-current balance. Using both methods of current

sampling utilizes the best advantages of each technique.

Protection features of this controller IC include a set of

sophisticated overvoltage, undervoltage, and overcurrent

protection. Overvoltage results in the converter turning the

lower MOSFETs ON to clamp the rising output voltage and

protect the microprocessor. The overcurrent protection level is

set through a single external resistor. Furthermore, the

ISL6566A 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 Multi-Phase Power Conversion

- 1 or 2-Phase Operation with Internal Drivers

- 3-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

• Precision Channel Current Sharing

• Accurate Load Line Programming

- Uses Loss-Less Inductor DCR Current Sampling

• Variable Gate Drive Bias: 5V to 12V

• Microprocessor Voltage Identification Inputs

- Up to a 6-Bit DAC

- Selectable between Intel’s VRM9, VRM10, or AMD

Hammer DAC codes

- Dynamic VID-on-the-fly Technology

• Multi-tiered Overvoltage and Overcurrent Protection

• Digital Soft-Start

• Selectable Operation Frequency up to 1.5MHz Per Phase

• Pb-Free Plus Anneal Available (RoHS Compliant)

Pinout

ISL6566A (QFN)

TOP VIEW

Ordering Information

PART NUMBER*

TEMP.

(°C)

PACKAGE

PKG.

DWG. #

ISL6566ACR

0 to 70 40 Ld 6x6 QFN

L40.6x6

ISL6566ACRZ (Note)

0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6

ISL6566ACRZA (Note) 0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6

ISL6566AIR

-40 to 85 40 Ld 6x6 QFN

L40.6x6

ISL6566AIRZ (Note)

-40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6

ISL6566AIRZA (Note) -40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6

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.

VID1

VID0

VID12.5

VRM10

REF

OFS

VCC

COMP

FB

VDIFF

1

40

2

3

4

5

6

7

8

9

10

30

29

28

27

26

25

24

23

22

21

39

38

37

36

35

34

33

32

31

11

12

13

14

15

16

17

18

19

20

BOOT1

PHASE1

NC

PWM3

NC

ISEN3

EN_PH3

NC

PHASE2

BOOT2

41

GND

Data Sheet

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

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Copyright Intersil Americas Inc. 2005. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

July 27, 2005