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®
Data Sheet
March 9, 2006
ISL6566
FN9178.4
Three-Phase Buck PWM Controller with
Integrated MOSFET Drivers for VRM9,
VRM10, and AMD Hammer Applications
The ISL6566 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 ISL6566 is the combined use of both
DCR and rDS(ON) current sensing. Load line voltage
positioning (droop) and overcurrent protection are
accomplished through continuous inductor DCR current
sensing, while rDS(ON) current sensing is used for accurate
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
ISL6566 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, 2, or 3-Phase Operation
• Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
• Precision Channel Current Sharing
- Uses Loss-Less rDS(ON) Current Sampling
• 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 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)
Pinout
ISL6566 (QFN)
TOP VIEW
40 39 38 37 36 35 34 33 32 31
VID1 1
VID0 2
VID12.5 3
VRM10 4
REF 5
OFS 6
VCC 7
COMP 8
FB 9
VDIFF 10
41
GND
30 BOOT1
29 PHASE1
28 PHASE2
27 UGATE2
26 BOOT2
25 ISEN2
24 PVCC2
23 LGATE2
22 PHASE3
21 BOOT3
11 12 13 14 15 16 17 18 19 20
1
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.
Copyright Intersil Americas Inc. 2004-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6566
Ordering Information
PART NUMBER
ISL6566CRR5184
ISL6566CR-TR5184
PART
MARKING
ISL6566CR
ISL6566CR
TEMP.
(°C)
0 to 70
0 to 70
PACKAGE
40 Ld 6x6 QFN
40 Ld 6x6 QFN Tape and Reel
PKG.
DWG. #
L40.6x6
L40.6x6
ISL6566CRZR5184 (Note)
ISL6566CRZ-TR5184 (Note)
ISL6566CRZAR5184 (Note)
ISL6566CRZ
ISL6566CRZ
ISL6566CRZ
0 to 70
0 to 70
0 to 70
40 Ld 6x6 QFN (Pb-free)
40 Ld 6x6 QFN (Pb-free) Tape and Reel
40 Ld 6x6 QFN (Pb-free)
L40.6x6
L40.6x6
L40.6x6
ISL6566CRZA-TR5184 (Note)
ISL6566IR
ISL6566IR-T
ISL6566IRZ (Note)
ISL6566CRZ
ISL6566IR
ISL6566IR
ISL6566IRZ
0 to 70
-40 to 85
-40 to 85
-40 to 85
40 Ld 6x6 QFN (Pb-free) Tape and Reel
40 Ld 6x6 QFN
40 Ld 6x6 QFN Tape and Reel
40 Ld 6x6 QFN (Pb-free)
L40.6x6
L40.6x6
L40.6x6
L40.6x6
ISL6566IRZ-T (Note)
ISL6566IRZ
-40 to 85 40 Ld 6x6 QFN (Pb-free) Tape and Reel
L40.6x6
ISL6566IRZA (Note)
ISL6566IRZ
-40 to 85 40 Ld 6x6 QFN (Pb-free)
L40.6x6
ISL6566IRZA-T (Note)
ISL6566IRZ
-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.
2 FN9178.4
March 9, 2006

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Block Diagram
ICOMP OCSET
ISL6566
PGOOD
ENLL
ISUM
IREF
ISEN AMP
100µA
OC
RGND
VSEN
VDIFF
VID4
VID3
VID2
VID1
VID0
VID12.5
VRM10
REF
FB
COMP
OFS
x1 x1
+1V
SOFT-START
AND
FAULT LOGIC
UVP
OVP
OVP
VOVP
+150mV
x 0.82
DYNAMIC
VID
D/A
0.2V
CLOCK AND
SAWTOOTH
GENERATOR
PWM1
PWM2
PWM3
E/A
OFFSET
CHANNEL
CURRENT
BALANCE
CHANNEL
CURRENT
SENSE
1
N
ISEN1 ISEN2 ISEN3
0.66V
POWER-ON
RESET
GATE
SHOOT-
CONTROL THROUGH
LOGIC PROTECTION
GATE
SHOOT-
CONTROL THROUGH
LOGIC PROTECTION
CHANNEL
DETECT
GATE
SHOOT-
CONTROL THROUGH
LOGIC PROTECTION
GND
3
VCC
PVCC1
BOOT1
UGATE1
PHASE1
LGATE1
FS
PVCC2
BOOT2
UGATE2
PHASE2
LGATE2
PVCC3
BOOT3
UGATE3
PHASE3
LGATE3
FN9178.4
March 9, 2006

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Typical Application - ISL6566
ISL6566
+5V
+12V
VDIFF
FB
VSEN
RGND
VCC
OFS
COMP PVCC1
BOOT1
UGATE1
PHASE1
ISEN1
LGATE1
FS
REF
PVCC2
VID4
VID3
VID2
VID1
VID0
VID12.5
VRM10
PGOOD
ISL6566
BOOT2
UGATE2
PHASE2
ISEN2
LGATE2
PVCC3
GND
ENLL
IREF
OCSET
ICOMP
BOOT3
UGATE3
PHASE3
ISEN3
ISUM
LGATE3
+12V
+12V
+12V
4
LOAD
FN9178.4
March 9, 2006

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ISL6566
Typical Application - ISL6566 with NTC Thermal Compensation
+5V
+12V
VDIFF
FB
VSEN
RGND
VCC
OFS
COMP PVCC1
BOOT1
UGATE1
PHASE1
ISEN1
LGATE1
FS
REF
PVCC2
VID4
VID3
VID2
VID1
VID0
VID12.5
VRM10
PGOOD
ISL6566
BOOT2
UGATE2
PHASE2
ISEN2
LGATE2
PVCC3
GND
ENLL
IREF
OCSET
ICOMP
BOOT3
UGATE3
PHASE3
ISEN3
LGATE3
ISUM
+12V
+12V
+12V
PLACE IN CLOSE
PROXIMITY
NTC
LOAD
5 FN9178.4
March 9, 2006