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®
Data Sheet
February 17, 2009
ISL6327A
FN6833.0
Enhanced 6-Phase PWM Controller with
8-Bit VID Code and Differential Inductor
DCR or Resistor Current Sensing
The ISL6327A controls microprocessor core voltage
regulation by driving up to 6 synchronous-rectified buck
channels in parallel. Multiphase buck converter architecture
uses interleaved timing to multiply channel ripple frequency
and reduce input and output ripple currents. Lower ripple
results in fewer components, lower component cost, reduced
power dissipation, and smaller implementation area.
Microprocessor loads can generate load transients with
extremely fast edge rates. The ISL6327A utilizes Intersil’s
proprietary Active Pulse Positioning (APP) and Adaptive
Phase Alignment (APA) modulation scheme to achieve the
extremely fast transient response with fewer output
capacitors.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6327A
senses the output current continuously by utilizing patented
techniques to measure the voltage across the dedicated
current sense resistor or the DCR of the output inductor.
Current sensing provides the needed signals for precision
droop, channel-current balancing, and overcurrent
protection. A programmable integrated temperature
compensation function is implemented to effectively
compensate the temperature variation of the current sense
element. The current limit function provides the overcurrent
protection for the individual phase.
A unity gain, differential amplifier is provided for remote
voltage sensing. Any potential difference between remote
and local grounds can be completely eliminated using the
remote-sense amplifier. Eliminating ground differences
improves regulation and protection accuracy. The
threshold-sensitive enable input is available to accurately
coordinate the start-up of the ISL6327A with any other
voltage rail. Dynamic-VID™ technology allows seamless
on-the-fly VID changes. The offset pin allows accurate
voltage offset settings that are independent of VID setting.
Features
• Proprietary Active Pulse Positioning and Adaptive Phase
Alignment Modulation Scheme
• Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and
Temperature
- Adjustable Precision Reference-Voltage Offset
• Precision Resistor or DCR Current Sensing
- Accurate Load-Line Programming, Channel-Current
Balancing, Differential Current Sense
• Microprocessor Voltage Identification Input
- Dynamic VID™ Technology
- 8-Bit VID Input with Selectable VR11 code and
Extended VR10 Code at 6.25mV Per Bit
- 0.5V to 1.600V Operation Range
• Monotonic Output Voltage Soft-start
• Thermal Monitoring
• Integrated Programmable Temperature Compensation
• Overcurrent Protection and Channel Current Limit
• Overvoltage Protection with OVP Output Indication
• 2-, 3-, 4-, 5- or 6-Phase Operation
• Adjustable Switching Frequency up to 1MHz Per Phase
• 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 (RoHS Compliant)
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6327ACRZ* ISL6327A CRZ 0 to +70 48 Ld 7x7 QFN L48.7x7
ISL6327AIRZ* ISL6327A IRZ -40 to +85 48 Ld 7x7 QFN L48.7x7
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: 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.
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. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6327A
ISL6327A
(48 LD QFN)
TOP VIEW
48 47 46 45 44 43 42 41 40 39 38 37
VID7 1
VID6 2
VID5 3
VID4 4
VID3 5
VID2 6
VID1 7
VID0 8
VRSEL 9
OFS 10
IOUT 11
DAC 12
GND
36 PWM3
35 ISEN3+
34 ISEN3-
33 ISEN1-
32 ISEN1+
31 PWM1
30 PWM4
29 ISEN4+
28 ISEN4-
27 ISEN2-
26 ISEN2+
25 PWM2
13 14 15 16 17 18 19 20 21 22 23 24
2 FN6833.0
February 17, 2009

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www.IDSatLaS6h3ee2t47UA.coBmlock Diagram
VDIFF VR_RDY
OVP
ISL6327A
VCC
RGND
VSEN
X1
OVP
+175MV
S OVP R
DRIVE
Q
SOFT-START
AND
FAULT LOGIC
POWER-ON
RESET (POR)
0.875V
EN_VTT
0.875V
EN_PWR
CLOCK AND
RAMP
GENERATOR
THREE-STATE
FS
SS
APP AND APA
PWM1
MODULATOR
OFS
REF
DAC
VRSEL
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
COMP
FB
IOUT
IDROOP
OFFSET
APP AND APA
MODULATOR
APP AND APA
MODULATOR
APP AND APA
MODULATOR
DYNAMIC
VID
D/A
2V
OC2
APP AND APA
MODULATOR
E/A APP AND APA
MODULATOR
CHANNEL CURRENT
BALANCE AND
CURRENT LIMIT
CHANNEL
DETECT
OC1
I_TRIP
1
N
I_TOT
TEMPERATURE
COMPENSATION
CHANNEL
CURRENT
SENSE
THERMAL
MONITORING
GND
TM VR_FAN VR_HOT
3
TEMPERATURE
COMPENSATION
GAIN
TCOMP
PWM2
PWM3
PWM4
PWM5
PWM6
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
ISEN5+
ISEN5-
ISEN6+
ISEN6-
FN6833.0
February 17, 2009

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ISL6327A
www.TDaytapSihceaetl4UA.cpomplication - 6-Phase Buck Converter with DCR Sensing and External TCOMP
NTC2
EXTERNAL TCOMP
COMPENSATION
NETWORK
+5V
VTT
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
OVP
R IOUT
VR_FAN
VR_HOT
+5V
FB
IDROOP
VDIFF
VSEN
RGND
EN_VTT
COMP REF
DAC
VCC
GND
ISL6327A
PWM6
ISEN6-
ISEN6+
PWM4
ISEN4-
ISEN4+
PWM2
ISEN2-
ISEN2+
IOUT
PWM1
ISEN1-
ISEN1+
PWM3
ISEN3-
ISEN3+
PWM5
ISEN5-
ISEN5+
TM EN_PWR
TCOMP OFS FS SS
ROFS RT
RSS
VIN
NTC
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
VIN
VIN
VIN
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
VIN
VIN
VIN
µP
LOAD
4 FN6833.0
February 17, 2009

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ISL6327A
www.TDaytapSihceaetl4UA.cpomplication - 6-Phase Buck Converter with DCR Sensing and Integrated TCOMP
+5V
FB
IDROOP
VDIFF
COMP REF
DAC
VSEN
RGND
VTT EN_VTT
VCC
GND
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
OVP
ISL6327A
PWM6
ISEN6-
ISEN6+
PWM4
ISEN4-
ISEN4+
PWM2
ISEN2-
ISEN2+
IOUT
R IOUT
PWM1
ISEN1-
ISEN1+
PWM3
ISEN3-
VR_FAN
VR_HOT
ISEN3+
PWM5
ISEN5-
ISEN5+
TM EN_PWR
+5V TCOMP OFS FS SS
+5V
ROFS RT
R SS
VIN
NTC
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
VIN
VIN
VIN
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
VIN
VIN
VIN
μP
LOAD
5 FN6833.0
February 17, 2009