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®
Data Sheet
March 20, 2007
ISL6564A
FN6285.1
Multiphase PWM Controller with Linear
6-Bit DAC Capable of Precision rDS(ON) or
DCR Differential Current Sensing
The ISL6564A is a Multiphase PWM controller which controls
microprocessor core voltage regulation by driving up to
4 synchronous-rectified buck channels. It features a high
bandwidth control loop to provide optimal response to the load
transients. With switching frequency up to 1.5MHz per phase,
the ISL6564A based voltage regulator requires minimum
components and PCB area in DC/DC converter application.
The ISL6564A 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 their conduction intervals. Current sensing
provides the needed signals for precision droop, channel-
current balancing, and overcurrent protection.
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 ISL6564A 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. The ISL6564A
uses a 5V bias and has a built-in shunt regulator to allow
12V bias using only a small external limiting resistor.
Ordering Information
PART
PART NUMBER MARKING
TEMP.
(°C)
PKG.
PACKAGE DWG. #
ISL6564ACRZ* ISL6564 ACRZ 0 to +70 40 Ld 6x6 QFN L40.6x6
(Note)
(Pb-free)
ISL6564AIRZ* ISL6564 AIRZ -40 to +85 40 Ld 6x6 QFN L40.6x6
(Note)
(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
- Adjustable Reference-Voltage Offset
• Precision rDS(ON) or DCR Current Sensing
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Differential Current Sense
- Low-Cost, Lossless Current Sensing
• Internal Shunt Regulator for 5V or 12V Biasing
• Microprocessor Voltage Identification Input
- Self Clocked Dynamic VID™ Control Technology
- 6-Bit VID Input
- 0.525V to 1.300V in 12.5mV Steps
• Threshold-Sensitive Enable Function for Power
Sequencing Control
• Overcurrent Protection
• Overvoltage Protection
- No Additional External Components Needed
- OVP Pin to Drive Crowbar Device
• 1, 2, 3, or 4 Phase Operation
• Up to 1.5MHz Per Phase Operation (>6MHz Ripple)
• QFN Package
- 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. 2006-2007. 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
ISL6564A
ISL6564A
(40 LD QFN)
TOP VIEW
40 39 38 37 36 35 34 33 32 31
VID5 1
VID4 2
VID3 3
VID2 4
VID1 5
VID0 6
GND 7
OFS 8
IOUT 9
DAC 10
GND
30 ISEN4+
29 ISEN4-
28 ISEN2-
27 ISEN2+
26 PWM2
25 PWM1
24 ISEN1+
23 ISEN1-
22 ISEN3-
21 ISEN3+
11 12 13 14 15 16 17 18 19 20
2 FN6285.1
March 20, 2007

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ISL6564A Block Diagram
ISL6564A
RGND
VSEN
VDIFF PGOOD
OVP
DRVEN
VCC
x1
S OVP R
LATCH
POWER-ON
RESET (POR)
Q
ENLL
1.29V
EN
OVP
+200mV
SOFT-START
AND
FAULT LOGIC
CLOCK AND
SAWTOOTH
GENERATOR
PWM
THREE-STATE
FS
PWM1
OFS
OFFSET
PWM
PWM2
REF
DAC
VID5
VID4
VID3
VID2
VID1
VID0
COMP
FB
IDROOP
DYNAMIC
VID
D/A
IOUT
PWM
PWM3
PWM
E/A
I_TRIP
OC
CHANNEL
CURRENT
BALANCE
I_TOT
CHANNEL
DETECT
SAMPLE
&
HOLD
CHANNEL
CURRENT
SENSE
GND
PWM4
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
3 FN6285.1
March 20, 2007

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ISL6564A
Typical Application for Voltage Regulation without Droop Using rDS(ON) Sensing
VIDPGOOD
PGOOD
OVP
VID5
VID4
VID3
VID2
VID1
VID0
DRVEN
+5V
FB COMP REF
IDROOP
VDIFF
DAC
VSEN
RGND
VCC
ENLL
EN
ISL6564A
ISEN1+
ISEN1-
PWM1
PWM2
OFS
FS
IOUT
ISEN2+
ISEN2-
PWM3
ISEN3+
ISEN3-
PWM4
ISEN4+
GND ISEN4-
NTC
NETWORK
VOLTAGE PROPOTIONAL
TO LOAD CURRENT
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+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 FN6285.1
March 20, 2007

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ISL6564A
Typical Application for Voltage Regulation without Droop Using DCR Sensing
VIDPGOOD
PGOOD
OVP
VID5
VID4
VID3
VID2
VID1
VID0
DRVEN
+5V
FB
IDROOP
VDIFF
VSEN
RGND
COMP REF
DAC
VCC
ENLL
EN
ISL6564A
ISEN1+
ISEN1-
PWM1
PWM2
OFS
FS
IOUT
ISEN2+
ISEN2-
PWM3
ISEN3+
ISEN3-
PWM4
ISEN4+
GND ISEN4-
NTC
NETWORK
VOLTAGE PROPOTIONAL
TO LOAD CURRENT
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+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 FN6285.1
March 20, 2007