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ISL6334, ISL6334A
®
www.DataSheet4U.com
Data Sheet
February 26, 2008
FN6482.0
VR11.1, 4-Phase PWM Controller with
Light Load Efficiency Enhancement and
Load Current Monitoring Features
The ISL6334, ISL6334A control microprocessor core voltage
regulation by driving up to 4 interleaved synchronous-rectified
buck channels in parallel. This multiphase architecture results
in multiplying channel ripple frequency and reducing input and
output ripple currents. Lower ripple results in fewer
components, lower cost, reduced power dissipation, and
smaller implementation area.
Microprocessor loads can generate load transients with
extremely fast edge rates and requires high efficiency at light
load. The ISL6334, ISL6334A utilizes Intersil’s proprietary
Active Pulse Positioning (APP), Adaptive Phase Alignment
(APA) modulation scheme, active phase adding and
dropping to achieve and maintain the extremely fast
transient response with fewer output capacitors and high
efficiency from light to full load.
The ISL6334, ISL6334A is designed to be completely
compliant with Intel VR11.1 specifications. It accurately
reports the load current via IMON pin to the microprocessor,
which sends an active low PSI# signal to the controller at low
power mode. The controller then enters 1- or 2-phase
operation with diode emulation option to reduce magnetic
core and switching losses, yielding high efficiency at light
load. After the PSI# signal is de-asserted, the dropped
phase(s) are added back to sustain heavy load transient
response and efficiency.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6334,
ISL6334A 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. The sensed current flows out of FB pin to develop the
precision voltage drop across the feedback resistor for droop
control. Current sensing circuits also provide the needed
signals for channel-current balancing, average overcurrent
protection and individual phase current limiting. An NTC
thermistor’s temperature is sensed via TM pin and internally
digitized for thermal monitoring and for integrated thermal
compensation of the current sense elements.
A unity gain, differential amplifier is provided for remote voltage
sensing and completely eliminates any potential difference
between remote and local grounds. This improves regulation
and protection accuracy. The threshold-sensitive enable input is
available to accurately coordinate the start-up of the ISL6334,
ISL6334A 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
• Intel VR11.1 Compliant
• Proprietary Active Pulse Positioning (APP) and Adaptive
Phase Alignment (APA) Modulation Scheme
• Proprietary Active Phase Adding and Dropping with Diode
Emulation Scheme For High Light Load Efficiency
• Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% Closed-loop System Accuracy Over Load, Line
and Temperature
- Bi-directional, Adjustable Reference-Voltage Offset
• Precision resistor or DCR Differential Current Sensing
- Accurate Load-Line (Droop) Programming
- Accurate Channel-Current Balancing
- Accurate Load Current Monitoring via IMON Pin
• Microprocessor Voltage Identification Input
- Dynamic VID™ Technology for VR11.1 Requirement
- 8-Bit VID, VR11 Compatible
• Average Overcurrent Protection and Channel Current Limit
• Precision Overcurrent Protection on IMON Pin
• Thermal Monitoring and Overvoltage Protection
• Integrated Programmable Temperature Compensation
• Integrated Open Sense Line Protection
• 1- to 4-Phase Operation, Coupled Inductor Compatibility
• Adjustable Switching Frequency up to 1MHz Per Phase
• Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
• Pb-Free (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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6334, ISL6334A
Ordering Information
www.DPaAtaRSTh(NeNoeUtt4eMU) B.cEoRm
PART
MARKING
TEMP. (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL6334IRZ*
ISL6334 IRZ
-40 to +85
40 Ld 6x6 QFN
L40.6x6
ISL6334AIRZ*
6334A IRZ
-40 to +85
40 Ld 6x6 QFN
L40.6x6
ISL6334CRZ*
ISL6334 CRZ
0 to +70
40 Ld 6x6 QFN
L40.6x6
ISL6334ACRZ*
6334A CRZ
0 to +70
40 Ld 6x6 QFN
L40.6x6
*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.
Pinout
ISL6334, ISL6334A
(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
PSI# 8
OFS 9
IMON 10
GND
30 ISEN3-
29 ISEN3+
28 ISEN1+
27 ISEN1-
26 PWM1
25 PWM4
24 ISEN4-
23 ISEN4+
22 ISEN2+
21 ISEN2-
11 12 13 14 15 16 17 18 19 20
2 FN6482.0
February 26, 2008

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ISL6334, ISL6334A
Controller and Driver Recommendation
CONTROLLER
www.DataSheet4U.com
COMMENTS
ISL6334
When PSI# is asserted low, the remained channel transmits a special PWM protocol that can be recognized only by the dedicated
VR11.1 drivers ISL6622/ISL6620 for Diode Emulation (DCM) operation. The dropped channel remains in tri-state.
ISL6334A
When PSI# is asserted low, the remained channel transmits normal CCM PWM that can be recognized by any Intersil driver such
as ISL6612/ISL6614, ISL6596, ISL6610, and even ISL6622/ISL6620. The dropped channel remains in tri-state.
DRIVER
GATE # OF
DRIVE GATE
VOLTAGE DRIVES
DIODE
EMULATION
(DE)
GATE DRIVE
DROP
(GVOT)
COMMENTS
ISL6622
12V Dual
Yes
Yes For PSI# channel and its coupled channel in coupled inductor
applications or all channels
ISL6622A,
ISL6622B
12V Dual
Yes
No For PSI# channel and its coupled channel in coupled inductor
applications or all channels.
ISL6620, ISL6620A
5V
Dual
Yes
No For PSI# channel and its coupled channel in coupled inductor
applications or all channels
ISL6612, ISL6612A 12V
Dual
No
No For dropped phases or all channels with ISL6634A
ISL6596
5V Dual
No
No For dropped phases or all channels with ISL6634A
ISL6614, ISL6614A 12V
Quad
No
No For dropped phases or all channels with ISL6634A
ISL6610, ISL6610A
5V
Quad
No
No For dropped phases or all channels with ISL6634A
NOTE: Note: Intersil 5V and 12V drivers are mostly pin-to-pin compatible and allow dual footprint layout to optimize MOSFET selection and efficiency.
Dual = One Synchronous Channel; Quad = Two Synchronous Channels.
3 FN6482.0
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ISL6334, ISL6334A
ISL6334 and ISL6334A Block Diagram
www.DataSheet4U.com
VDIFF VR_RDY FS
PSI#
RGND
VSEN
-
X1
+
CLOCK AND
RAMP GENERATOR
N
POWER-ON
RESET (POR)
+
OVP
-
SOFT-START
AND
FAULT LOGIC
- 0.875
+
EN_VTT
- 0.875
+ EN_PWR
+175mV
SS
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
DAC
DYNAMIC
VID
D/A
OFS
REF
FB
COMP
OFFSET
IMON
1.11V
+
OCP
-
1.11V
VR_HOT
VR_FAN
THERMAL
MONITOR
TM
APP and APA
MODULATOR
APP and APA
MODULATOR
PWM1
PWM2
APP and APA
MODULATOR
PWM3
APP and APA
MODULATOR
PWM4
+
E/A
-
CHANNEL
CURRENT
BALANCE
AND PEAK
CURRENT LIMIT
CHANNEL
DETECT
N
+
OCP
-
I_TRIP
Σ1
N
TEMPERATURE
COMPENSATION
CHANNEL
CURRENT
SENSE
TEMPERATURE
COMPENSATION
GAIN ADJUST
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
TCOMP
GND
4 FN6482.0
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ISL6334, ISL6334A
Typical Application: 4-Phase VR with Integrated Thermal Compensation, PSI# (DE and GVOT)
www.DataSheet4U.com
+12V
PVCC
BOOT
VIN
+5V
VTT
VR_RDY
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
PSI#
VR_FAN
VR_HOT
VIN
FB COMP VCC DAC
REF
VDIFF
VSEN
RGND
EN_VTT
PWM1
ISEN1-
ISEN1+
ISISLL6633334 4
PWM2
ISEN2-
ISEN2+
PWM3
ISEN3-
ISEN3+
EN_PWR
+5V GND
IMON
TCOMP
PWM4
ISEN4-
ISEN4+
TM OFS FS SS
+5V +5V
NTC
NTC: NTHS0805N02N6801,
6.8kΩ, VISHAY
VCC
PWM
ISL6622
DRIVER
UGATE
PHASE
LGATE
GND
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
µP
LOAD
5 FN6482.0
February 26, 2008