DATASHEET
ISL6327
Enhanced 6-Phase PWM Controller with 8-Bit VID Code and Differential Inductor
DCR or Resistor Current Sensing
The ISL6327 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 ISL6327 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 ISL6327
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 ISL6327 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.
FN9276
Rev 4.00
May 5, 2008
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
- Accurate 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
• 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
(Pb-Free)
PKG.
DWG. #
ISL6327CRZ* ISL6327CRZ
ISL6327IRZ*
ISL6327IRZ
0 to +70 48 Ld 7x7 QFN L48.7x7
-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.
FN9276 Rev 4.00
May 5, 2008
Page 1 of 30
ISL6327
Pinout
ISL6327
(48 LD QFN)
TOP VIEW
EN_PWR
VR_HOT
VR_RDY
VR_FAN
EN_VTT
ISEN6+
38
ISEN6-
PWM6
37
36
35
34
33
32
31
GND
30
29
28
27
26
25
13
REF
14
COMP
15
FB
16
IDROOP
17
VDIFF
18
RGND
19
VSEN
20
TCOMP
21
VCC
22
ISEN5-
23
ISEN5+
24
PWM5
PWM3
ISEN3+
ISEN3-
ISEN1-
ISEN1+
PWM1
PWM4
ISEN4+
ISEN4-
ISEN2-
ISEN2+
PWM2
TM
OVP
SS
43
48
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
OFS
IOUT
DAC
1
2
3
4
5
6
7
8
9
10
11
12
47
46
45
44
FS
42
41
40
39
FN9276 Rev 4.00
May 5, 2008
Page 2 of 30
ISL6327
ISL6327 Block Diagram
VDIFF
VR_RDY
OVP
VCC
RGND
X1
VSEN
S
OVP
DRIVE
Q
OVP
THREE-STATE
SOFT-START
AND
FAULT LOGIC
CLOCK AND
RAMP
GENERATOR
R
0.875V
POWER-ON
RESET (POR)
0.875V
EN_VTT
EN_PWR
FS
+175MV
SS
APP AND APA
MODULATOR
PWM1
OFS
OFFSET
APP AND APA
MODULATOR
PWM2
REF
DAC
VRSEL
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
COMP
FB
2V
APP AND APA
MODULATOR
PWM3
APP AND APA
MODULATOR
PWM4
DYNAMIC
VID
D/A
E/A
APP AND APA
MODULATOR
PWM5
APP AND APA
MODULATOR
PWM6
CHANNEL CURRENT
BALANCE AND
CURRENT LIMIT
CHANNEL
DETECT
ISEN1+
ISEN1-
I_TRIP
OC2
OC1
1
N
ISEN2+
TEMPERATURE
COMPENSATION
CHANNEL
CURRENT
SENSE
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
IOUT
I_TOT
IDROOP
ISEN5+
THERMAL
MONITORING
TEMPERATURE
COMPENSATION
GAIN
ISEN5-
ISEN6+
ISEN6-
GND
TM
VR_FAN VR_HOT
TCOMP
FN9276 Rev 4.00
May 5, 2008
Page 3 of 30
ISL6327
Typical Application - 6-Phase Buck Converter with DCR Sensing and External TCOMP
+5V
VIN
VCC
BOOT
UGATE
NTC2
EXTERNAL TCOMP
COMPENSATION
NETWORK
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
+5V
VCC
BOOT
UGATE
VIN
EN
FB
IDROOP
VDIFF
VSEN
RGND
VTT
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
OVP
IOUT
R IOUT
EN_VTT
COMP REF
DAC
VCC
GND
+5V
VCC
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
BOOT
UGATE
VIN
ISL6327
PWM6
ISEN6-
ISEN6+
PWM4
ISEN4-
ISEN4+
PWM2
ISEN2-
ISEN2+
PWM1
ISEN1-
ISEN1+
PWM3
ISEN3-
ISEN3+
EN
PWM
GND
ISL6609
DRIVER
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
PHASE
LGATE
VIN
µP
LOAD
VR_FAN
VR_HOT
TM
+5V
PWM5
ISEN5-
ISEN5+
EN_PWR
SS
+5V
VCC
BOOT
UGATE
VIN
TCOMP OFS FS
EN
R OFS
RT
R
SS
VIN
NTC
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
EN
PWM
GND
PHASE
LGATE
VIN
ISL6609
DRIVER
FN9276 Rev 4.00
May 5, 2008
Page 4 of 30
ISL6327
Typical Application - 6-Phase Buck Converter with DCR Sensing and Integrated TCOMP
+5V
VIN
VCC
BOOT
UGATE
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
+5V
VCC
BOOT
UGATE
VIN
FB
IDROOP
VDIFF
VSEN
RGND
VTT
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
OVP
IOUT
R IOUT
EN_VTT
EN
COMP REF
DAC
VCC
GND
+5V
VCC
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
BOOT
UGATE
VIN
ISL6327
PWM6
ISEN6-
ISEN6+
PWM4
ISEN4-
ISEN4+
PWM2
ISEN2-
ISEN2+
PWM1
ISEN1-
ISEN1+
PWM3
ISEN3-
ISEN3+
EN
PWM
GND
ISL6609
DRIVER
EN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
+5V
VCC
BOOT
UGATE
PHASE
LGATE
VIN
P
LOAD
VR_FAN
VR_HOT
TM
+5V
PWM5
ISEN5-
ISEN5+
EN_PWR
SS
+5V
VCC
BOOT
UGATE
VIN
TCOMP OFS FS
+5V
R OFS
EN
RT
R SS
VIN
PWM
GND
ISL6609
DRIVER
PHASE
LGATE
NTC
+5V
VCC
BOOT
UGATE
EN
PWM
GND
PHASE
LGATE
VIN
ISL6609
DRIVER
FN9276 Rev 4.00
May 5, 2008
Page 5 of 30
