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DATASHEET
ISL6334D
VR11.1, 4-Phase PWM Controller with Phase Dropping, Droop Disabled and Load
Current Monitoring Features
FN6802
Rev 4.00
Apr 29, 2016
The ISL6334D controls voltage regulator 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 ISL6334D 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 ISL6334D is designed to be completely compliant with
Intel VR11.1 specifications. It accurately reports the load
current via the 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 a 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.
The ISL6334D 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 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 the 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 ISL6334D
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 with droop disabled
• Proprietary Active Pulse Positioning (APP) and Adaptive
Phase Alignment (APA) modulation scheme
• Proprietary active phase adding and dropping 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 channel-current balancing
- Accurate load current monitoring via the 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) package outline
• Pb-free (RoHS compliant)
FN6802 Rev 4.00
Apr 29, 2016
Page 1 of 28

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ISL6334D
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ISL6334D Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Application: 4-Phase VR with PSI# and No Droop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Application - 4-Phase Couple Inductor VR with 2-Phase PSI# and No Droop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Functional Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Multiphase Power Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Interleaving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PWM Modulation Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PWM and PSI# Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Channel-Current Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Voltage Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output-Voltage Offset Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Dynamic VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operation Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Enable and Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Soft-Start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Current Sense Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fault Monitoring and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
VR_RDY Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Undervoltage Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Thermal Monitoring (VR_HOT/VR_FAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Temperature Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Integrated Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Design Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
External Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
General Design Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Power Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Current Sensing Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Output Filter Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Switching Frequency Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Input Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Voltage-Regulator (VR) Design Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
FN6802 Rev 4.00
Apr 29, 2016
Page 2 of 28

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ISL6334D
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL6334DIRZ
6334D IRZ
-40 to +85
40 Ld 6x6 QFN
L40.6x6
ISL6334DCRZ
6334D CRZ
0 to +70
40 Ld 6x6 QFN
L40.6x6
NOTES:
1. Add “-T” suffix for a 4k unit tape and reel option. Please refer to TB347 for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6334D. For more information on MSL please see techbrief TB363.
INTERSIL PN
ISL6336
ISL6336A
ISL6336D
ISL6334
ISL6334A
ISL6334D
NUMBER OF PHASES
6
6
6
4
4
4
TABLE 1. ISL6336x/4x FAMILY SUMMARY
DIODE
EMULATION
DROOP
H_CPURST_N INPUT
Yes Yes
No
No Yes
No
No No
No
Yes Yes
No
No Yes
No
No No
No
Pin Configuration
ISL6334D
(40 LD QFN)
TOP VIEW
TARGETED APPLICATIONS
VR11.x CPU
VR11.x CPU
General Purpose, Memory
VR11.x CPU
VR11.x CPU
General Purpose, Memory
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
FN6802 Rev 4.00
Apr 29, 2016
Page 3 of 28

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ISL6334D
ISL6334D Block Diagram
VDIFF VR_RDY FS PSI#
RGND
VSEN
-
X1
+
CLOCK AND
RAMP GENERATOR
N
+
OVP
-
SOFT-START
AND
FAULT LOGIC
P O W ER -O N
RESET (POR)
- 0.870
+ EN_VTT
- 0.870
+ 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
FN6802 Rev 4.00
Apr 29, 2016
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
+
OCP
-
I_TRIP
1
N
TEMPERATURE
COMPENSATION
TEMPERATURE
COMPENSATION
GAIN ADJUST
CHANNEL
DETECT
N
CHANNEL
CURRENT
SENSE
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
TCOMP
FIGURE 1. BLOCK DIAGRAM
GND
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ISL6334D
Typical Application: 4-Phase VR with PSI# and No Droop
+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+
ISL6334D
PWM2
ISEN2-
ISEN2+
PWM3
ISEN3-
ISEN3+
EN_PWR
+5V GND
IMON
TCOMP
PWM4
ISEN4-
ISEN4+
TM OFS FS SS
+5V +5V
NTC
NTC: NTHS0805N02N6801,
6.8k, VISHAY
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
+12V
PVCC
BOOT
VCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
VIN
VIN
VIN
FIGURE 2. 4-PHASE VR WITH PSI# AND NO DROOP
FN6802 Rev 4.00
Apr 29, 2016
µP
LOAD
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