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®
Data Sheet
March 9, 2006
ISL6306
FN9226.0
4-Phase PWM Controller with 8-Bit DAC
Code Capable of Precision RDS(ON) or
DCR Differential Current Sensing
The ISL6306 controls microprocessor core voltage regulation
by driving up to 4 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 ISL6306 features a high
bandwidth control loop and ripple frequencies up to >4MHz
to provide optimal response to the transients.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6306
senses current by utilizing patented techniques to measure
the voltage across the on resistance, RDS(ON), of the lower
MOSFETs or DCR of the output inductor during the lower
MOSFET conduction intervals. Current sensing provides the
needed signals for precision droop, channel-current
balancing, and overcurrent protection. A programmable
internal temperature compensation function is implemented
to effectively compensate for the temperature coefficient of
the current sense element.
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 ISL6306 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.
Ordering Information
PART
TEMP.
PART NUMBER MARKING (°C)
PKG.
PACKAGE DWG. #
ISL6306CRZ (Note) ISL6306CRZ 0 to 70 40 Ld 6x6 QFN L40.6x6
(Pb-free)
ISL6306IRZ (Note) ISL6306IRZ -40 to 85 40 Ld 6x6 QFN L40.6x6
(Pb-free)
Add “-T” suffix for tape and reel.
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.
Features
• 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 RDS(ON) 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 1.6V Operation Range
• Thermal Monitoring
• Integrated Programmable Temperature Compensation
• Threshold-Sensitive Enable Function for Power
Sequencing and VTT Enable
• Overcurrent Protection
• Overvoltage Protection
• 2, 3 or 4 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 Plus Anneal Available (RoHS Compliant)
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. 2006. All Rights Reserved. Dynamic VID™ is a trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.

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Pinout
ISL6306
ISL6306 (40 LD QFN)
TOP VIEW
40 39 38 37 36 35 34 33 32 31
VID6 1
VID5 2
VID4 3
VID3 4
VID2 5
VID1 6
VID0 7
VRSEL 8
OFS 9
DAC 10
GND
30 ISEN3+
29 ISEN3-
28 ISEN2-
27 ISEN2+
26 PWM2
25 PWM4
24 ISEN4+
23 ISEN4-
22 ISEN1-
21 ISEN1+
11 12 13 14 15 16 17 18 19 20
2 FN9226.0
March 9, 2006

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ISL6306CR Block Diagram
VDIFF VR_RDY
RGND
VSEN
x1
OVP
+175mV
SS
SOFT-START
AND
FAULT LOGIC
ISL6306
VCC
POWER-ON
RESET (POR)
0.875V
EN_VTT
0.875V
EN_PWR
CLOCK AND
SAWTOOTH
GENERATOR
PWM
THREE-STATE
FS
PWM1
OFS
REF
DAC
VRSEL
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
COMP
FB
IDROOP
OFFSET
DYNAMIC
VID
D/A
VR_HOT
VR_FAN
THERMAL
MONITORING
TM
PWM
PWM2
PWM
PWM3
PWM
E/A
CHANNEL
CURRENT
BALANCE
CHANNEL
DETECT
I_TRIP
OC
1
N
I_AVG
THERMAL
COMPENSATION
GAIN
TEMPERATURE
COMPENSATION
CHANNEL
CURRENT
SENSE
PWM4
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
TCOMP
GND
3 FN9226.0
March 9, 2006

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ISL6306
Typical Application - 4-Phase Buck Converter with RDS(ON) Sensing and External TCOMP
+12V
VCC
BOOT
VIN
UGATE
PVCC
ISL6612 PHASE
PWM
DRIVER
LGATE
NTC
+5V
GND
THERMISTOR
VTT
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
VR_FAN
VR_HOT
+5V
FB COMP REF
IDROOP
VDIFF
DAC
VSEN
RGND
VCC
EN_VTT
ISL6306
ISEN1+
ISEN1-
PWM1
PWM2
ISEN2+
ISEN2-
PWM3
ISEN3+
ISEN3-
PWM4
ISEN4+
ISEN4-
GND
TM EN_PWR
TCOMP OFS FS SS
ROFS RT
+12V
NTC
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+12V
VCC
PVCC
PWM
BOOT
UGATE
ISL6612
DRIVER
PHASE
LGATE
GND
VIN
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
µP
LOAD
4 FN9226.0
March 9, 2006

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ISL6306
Typical Application - 4-Phase Buck Converter with RDS(ON) Sensing and Integrated TCOMP
+12V
VCC
BOOT
VIN
UGATE
PVCC
PWM
ISL6612
DRIVER
PHASE
LGATE
+5V GND
VTT
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
FB
IDROOP
VDIFF
VSEN
RGND
EN_VTT
COMP REF
DAC
VCC
ISL6306
ISEN1+
ISEN1-
PWM1
PWM2
ISEN2+
ISEN2-
PWM3
ISEN3+
ISEN3-
PWM4
ISEN4+
ISEN4-
VR_FAN
GND
VR_HOT
TM EN_PWR
+5V TCOMP OFS FS SS
+5V
ROFS RF
RS
NTC
+12V
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+12V
VCC
PVCC
PWM
BOOT
UGATE
ISL6612
DRIVER
PHASE
LGATE
GND
VIN
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
µP
LOAD
5 FN9226.0
March 9, 2006