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®
Data Sheet
March 9, 2006
ISL6568
FN9187.4
Two-Phase Buck PWM Controller with
Integrated MOSFET Drivers for VRM9,
VRM10, and AMD Hammer Applications
The ISL6568 two-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 ISL6568 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
ISL6568 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
• 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-on-the-fly 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
ISL6568 (QFN)
TOP VIEW
32 31 30 29 28 27 26 25
VID12.5 1
24 BOOT1
REF 2
23 PHASE1
OFS 3
22 VID4
VCC 4
COMP 5
33
GND
21 VID3
20 ENLL
FB 6
19 PHASE2
VDIFF 7
18 BOOT2
RGND 8
17 UGATE2
9 10 11 12 13 14 15 16
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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ISL6568
Ordering Information
PART NUMBER*
PART
MARKING
TEMP.
(°C)
PACKAGE
PKG.
DWG. #
ISL6568CRR5184
ISL6568CR
0 to 70
32 Ld 5x5 QFN
L32.5x5
ISL6568CR-TR5184
ISL6568CR
0 to 70
32 Ld 5x5 QFN (Pb-free) Tape and Reel
L32.5x5
ISL6568CRZR5184
ISL6568CRZ
0 to 70
32 Ld 5x5 QFN (Pb-free)
L32.5x5
ISL6568CRZ-TR5184
ISL6568CRZ
0 to 70
32 Ld 5x5 QFN (Pb-free) Tape and Reel
L32.5x5
ISL6568CRZAR5184
ISL6568CRZ
0 to 70
32 Ld 5x5 QFN (Pb-free)
L32.5x5
ISL6568CRZA-TR5184
ISL6568CRZ
0 to 70
32 Ld 5x5 QFN (Pb-free) Tape and Reel
L32.5x5
ISL6568IR
ISL6568IR
-40 to 85
32 Ld 5x5 QFN
L32.5x5
ISL6568IR-T
ISL6568IR
-40 to 85
32 Ld 5x5 QFN Tape and Reel
L32.5x5
ISL6568IRZ
ISL6568IRZ
-40 to 85
32 Ld 5x5 QFN (Pb-free)
L32.5x5
ISL6568IRZ-T
ISL6568IRZ
-40 to 85
32 Ld 5x5 QFN (Pb-free) Tape and Reel
L32.5x5
ISL6568IRZA
ISL6568IRZ
-40 to 85
32 Ld 5x5 QFN (Pb-free)
L32.5x5
ISL6568IRZA-T
ISL6568IRZ
-40 to 85
32 Ld 5x5 QFN (Pb-free) Tape and Reel
L32.5x5
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 FN9187.4
March 9, 2006

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Block Diagram
ICOMP OCSET
ISL6568
PGOOD
ENLL
ISUM
IREF
ISEN AMP
100µA
OC
RGND
VSEN
VDIFF
VID4
VID3
VID2
VID1
VID0
VID12.5
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
E/A
OFFSET
CHANNEL
CURRENT
BALANCE
CHANNEL
CURRENT
SENSE
1
N
0.66V
POWER-ON
RESET
GATE
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
GATE
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
PHASE 2
DETECT
ISEN1 ISEN2
GND
3
VCC
PVCC
BOOT1
UGATE1
PHASE1
LGATE1
FS
BOOT2
UGATE2
PHASE2
LGATE2
FN9187.4
March 9, 2006

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Typical Application - ISL6568
ISL6568
VDIFF
FB
COMP
VSEN
RGND
+5V
VCC
OFS
FS
REF
PVCC1
BOOT1
UGATE1
PHASE1
ISEN1
LGATE1
+12V
VID4
VID3
VID2
VID1
VID0
VID12.5
PGOOD
GND
ISL6568
PVCC2
BOOT2
UGATE2
PHASE2
ISEN2
LGATE2
ENLL
IREF
OCSET
ICOMP
ISUM
+12V
+12V
4
LOAD
FN9187.4
March 9, 2006

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ISL6568
Typical Application - ISL6568 with NTC Thermal Compensation
VDIFF
FB
COMP
VSEN
RGND
+5V
VCC
OFS
FS
REF
PVCC1
BOOT1
UGATE1
PHASE1
ISEN1
LGATE1
+12V
VID4
VID3
VID2
VID1
VID0
VID12.5
PGOOD
GND
ISL6568
PVCC2
BOOT2
UGATE2
PHASE2
ISEN2
LGATE2
ENLL
IREF
OCSET
ICOMP
ISUM
+12V
+12V
PLACE IN CLOSE
PROXIMITY
NTC
LOAD
5 FN9187.4
March 9, 2006