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DATASHEET
ISL6568
Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9,
VRM10, and AMD Hammer Applications
FN9187
Rev 5.00
Jan 12, 2012
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 (RoHS Compliant)
FN9187 Rev 5.00
Jan 12, 2012
Page 1 of 30

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ISL6568
Pin Configuration
ISL6568
(32 LD 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
21 VID3
COMP 5
20 ENLL
FB 6
19 PHASE2
VDIFF 7
18 BOOT2
RGND 8
17 UGATE2
9 10 11 12 13 14 15 16
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL6568CRZ
ISL6568CRZ
0 to +70
32 Ld 5x5 QFN
L32.5x5
ISL6568CRZ-T (Note 1)
ISL6568CRZ
0 to +70
32 Ld 5x5 QFN, Tape and Reel
L32.5x5
ISL6568CRZR5184
ISL6568CRZ
0 to +70
32 Ld 5x5 QFN
L32.5x5
ISL6568CRZ-TR5184 (Note 1)
ISL6568CRZ
0 to +70
32 Ld 5x5 QFN, Tape and Reel
L32.5x5
ISL6568CRZAR5184
ISL6568CRZ
0 to +70
32 Ld 5x5 QFN
L32.5x5
ISL6568CRZA-TR5184 (Note 1)
ISL6568CRZ
0 to +70
32 Ld 5x5 QFN, Tape and Reel
L32.5x5
ISL6568IRZ
ISL6568IRZ
-40 to +85
32 Ld 5x5 QFN
L32.5x5
ISL6568IRZ-T (Note 1)
ISL6568IRZ
-40 to +85
32 Ld 5x5 QFN, Tape and Reel
L32.5x5
ISL6568IRZA
ISL6568IRZ
-40 to +85
32 Ld 5x5 QFN
L32.5x5
ISL6568IRZA-T (Note 1)
ISL6568IRZ
-40 to +85
32 Ld 5x5 QFN, Tape and Reel
L32.5x5
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6568. For more information on MSL please see tech brief TB363.
FN9187 Rev 5.00
Jan 12, 2012
Page 2 of 30

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ISL6568
Block Diagram
ICOMP OCSET
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
VCC
PVCC
BOOT1
UGATE1
PHASE1
LGATE1
FS
BOOT2
UGATE2
PHASE2
LGATE2
FN9187 Rev 5.00
Jan 12, 2012
Page 3 of 30

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ISL6568
Typical Application - 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
FN9187 Rev 5.00
Jan 12, 2012
LOAD
Page 4 of 30

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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
FN9187 Rev 5.00
Jan 12, 2012
Page 5 of 30