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®
Data Sheet
February 15, 2007
ISL6312A
FN9290.2
Four-Phase Buck PWM Controller with
Integrated MOSFET Drivers for Intel VR10,
VR11, and AMD Applications
The ISL6312A four-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
multiphase product families. By reducing the number of
external parts, this integration is optimized for a cost and
space saving power management solution.
One outstanding feature of this controller IC is its
multi-processor compatibility, allowing it to work with both
Intel and AMD microprocessors. Included are programmable
VID codes for Intel VR10, VR11, as well as AMD DAC
tables. 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.
The ISL6312A also includes advanced control loop features
for optimal transient response to load apply and removal.
One of these features is highly accurate, fully differential,
continuous DCR current sensing for load line programming
and channel current balance. Active Pulse Positioning (APP)
modulation is another unique feature, allowing for quicker
initial response to high di/dt load transients.
This controller also allows the user the flexibility to choose
between PHASE detect or LGATE detect adaptive dead time
schemes. This ability allows the ISL6312A to be used in a
multitude of applications where either scheme is required.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Furthermore, the ISL6312A 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 Multiphase Power Conversion
- 2-Phase or 3-Phase Operation with Internal Drivers
- 4-Phase Operation with External PWM Driver Signal
• Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
• Optimal Transient Response
- Active Pulse Positioning (APP) Modulation
- Adaptive Phase Alignment (APA)
• Fully Differential, Continuous DCR Current Sensing
- Accurate Load Line Programming
- Precision Channel Current Balancing
• User Selectable Adaptive Dead Time Scheme
- PHASE Detect or LGATE Detect for Application
Flexibility
• Variable Gate Drive Bias: 5V to 12V
• Multi-Processor Compatible
- Intel VR10 and VR11 Modes of Operation
- AMD Mode of Operation
• Microprocessor Voltage Identification Inputs
- 8-bit DAC
- Selectable between Intel’s Extended VR10, VR11, AMD
5-bit, and AMD 6-bit DAC Tables
- Dynamic VID Technology
• Overcurrent Protection
• Load Current Indicator
• Multi-Tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
PART NUMBER PART
(Note)
MARKING
TEMP.
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6312ACRZ* ISL6312 ACRZ 0 to +70 48 Ld 7x7 QFN L48.7x7
ISL6312AIRZ* ISL6312 AIRZ -40 to +85 48 Ld 7x7 QFN L48.7x7
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.
*Add “-T” suffix for tape and reel.
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, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Pinout
ISL6312A
ISL6312A
(48 LD QFN)
TOP VIEW
48 47 46 45 44 43 42 41 40 39 38 37
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
VRSEL 6
DRSEL 7
OVPSEL 8
SS 9
VCC 10
REF 11
OFS 12
49
GND
36 EN
35 ISEN1+
34 ISEN1-
33 PHASE1
32 UGATE1
31 BOOT1
30 LGATE1
29 PVCC1_2
28 LGATE2
27 BOOT2
26 UGATE2
25 PHASE2
13 14 15 16 17 18 19 20 21 22 23 24
ISL6312A Integrated Driver Block Diagram
DRSEL
PWM
SOFT-START
AND
FAULT LOGIC
GATE
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
PVCC
BOOT
UGATE
20kΩ
PHASE
10kΩ
LGATE
2 FN9290.2
February 15, 2007

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Block Diagram
VSEN
RGND
VDIFF
OPEN SENSE
LINE PREVENTION
x1
UNDERVOLTAGE
DETECTION
LOGIC
ISL6312A
PGOOD SS
SOFT-START
AND
FAULT LOGIC
OVERVOLTAGE
DETECTION
LOGIC
0.2V
EN
0.85V
POWER-ON
RESET
MOSFET
DRIVER
VCC
PVCC1_2
BOOT1
UGATE1
PHASE1
LGATE1
OVPSEL
LOAD APPLY
TRANSIENT
ENHANCEMENT
VRSEL
MODE / DAC
SELECT
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
REF
FB
COMP
OFS
DYNAMIC
VID
D/A
OFFSET
IOUT
x1
OC
I_TRIP
E/A
I_AVG
OCP
CLOCK AND
MODULATOR
WAVEFORM
GENERATOR
PWM1
PWM2
PWM3
PWM4
CHANNEL
CURRENT
BALANCE
I_AVG 1
N
VOCP
CH1
CURRENT
SENSE
CH2
CURRENT
SENSE
CH3
CURRENT
SENSE
CH4
CURRENT
SENSE
ISEN1- ISEN1+ ISEN2- ISEN2+ ISEN3- ISEN3+ ISEN4- ISEN4+
3
MOSFET
DRIVER
DRSEL
FS
BOOT2
UGATE2
PHASE2
LGATE2
CHANNEL
DETECT
PH4 POR/
DETECT
MOSFET
DRIVER
EN_PH4
PVCC3
BOOT3
UGATE3
PHASE3
LGATE3
PWM4
SIGNAL
LOGIC
PWM4
GND
FN9290.2
February 15, 2007

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ISL6312A
Typical Application - ISL6312A (4-Phase)
+5V
+12V
FB
COMP
VSEN
RGND
VCC
VDIFF
OFS
FS
REF
BOOT1
UGATE1
PHASE1
LGATE1
ISEN1-
ISEN1+
PVCC1_2
SS BOOT2
UGATE2
PHASE2
OVPSEL
LGATE2
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
PGOOD
ISL6312A
ISEN2-
ISEN2+
PVCC3
BOOT3
UGATE3
PHASE3
LGATE3
ISEN3-
ISEN3+
EN
IOUT
DRSEL
GND
EN_PH4
PWM4
ISEN4-
ISEN4+
+12V
+12V
+12V
+12V
BOOT
VCC UGATE
PVCC
PHASE
ISL6612
LGATE
PWM GND
+12V
4
LOAD
FN9290.2
February 15, 2007

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ISL6312A
Typical Application - ISL6312A with NTC Thermal Compensation (4-Phase)
+5V
+12V
FB
COMP
VSEN
RGND
VCC
OFS
FS
REF
VDIFF
BOOT1
UGATE1
PHASE1
LGATE1
ISEN1-
ISEN1+
PVCC1_2
+12V
+12V
SS
OVPSEL
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VRSEL
PGOOD
BOOT2
UGATE2
PHASE2
LGATE2
ISL6312A
ISEN2-
ISEN2+
PVCC3
BOOT3
UGATE3
PHASE3
EN
IOUT
LGATE3
ISEN3-
ISEN3+
+12V
+12V
DRSEL
GND
EN_PH4
PWM4
ISEN4-
ISEN4+
BOOT
VCC UGATE
PVCC PHASE
ISL6612
LGATE
PWM GND
+12V
NTC
PLACE IN
CLOSE
PROXIMITY
LOAD
5 FN9290.2
February 15, 2007