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®
Data Sheet
March 2003
ISL6561
FN9098.1
Multi-Phase PWM Controller with
Precision Rds(on) or DCR Differential
Current Sensing for VR10.X Application
The ISL6561 controls microprocessor core voltage regulation
by driving up to 4 synchronous-rectified buck channels in
parallel. Multi-phase 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 ISL6561 features a high
bandwidth control loop and ripple frequencies of >4MHz to
provide optimal response to the transients.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6561
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 over-current protection.
The accuracy of the current-sensing method is enhanced by
the ISL6561’s temperature compensation function. Droop
accuracy can be affected by increasing rDS(on) or DCR with
elevated temperature. The ISL6561 uses an internal
temperature-sensing element to provide programmable
temperature compensation. Correctly applied, temperature
compensation can completely nullify the effect of rDS(on) or
DCR temperature sensitivity.
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 ISL6561 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 ISL6561
uses 5V bias and has a built-in shunt regulator to allow 12V
bias using only a small external limiting resistor.
Ordering Information
PART NUMBER TEMP. (oC) PACKAGE PKG. NO.
ISL6561CR
0 to 105 40 Ld 6x6 QFN L40.6X6
Features
• Precision Multi-Phase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and
Temperature
- Adjustable Reference-Voltage Offset
• Precision RDS(on) or DCR Current Sensing
- Integrated Programmable Temperature Compensation
- 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
- Dynamic VID™ technology
- 6-Bit VID Input
- .8375V to 1.600V in 12.5mV Steps
• Threshold-Sensitive Enable Function for synchronizing
with driver POR
• Over Current Protection
• Over-Voltage Protection
- No Additional External Components Needed
- OVP Pin to drive opitional Crowbar Device
• 2, 3, or 4 Phase Operation
• Greater Than 1MHz Operation (> 4MHz Ripple)
• QFN 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
Pinout
ISL6561 (40-PIN QFN)
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
VID12.5 6
GND 7
OFS 8
TCOMP 9
DAC 10
30 ISEN4+
29 ISEN4-
28 ISEN2-
27 ISEN2+
26 PWM2
25 PWM1
24 ISEN1+
23 ISEN1-
22 ISEN3-
21 ISEN3+
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Dynamic VID™ is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved

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ISL6561CR Block Diagram
ISL6561
RGND
VSEN
VDIFF PGOOD
OVP
S OVP R
x1 LATCH
Q
VCC
POWER-ON
RESET (POR)
ENLL
1.24V
EN
OVP
+200mV
SOFT START
AND
FAULT LOGIC
CLOCK AND
SAWTOOTH
GENERATOR
PWM
TRI-STATE
FS
PWM1
OFS
OFFSET
PWM
PWM2
REF
DAC
VID4
VID3
VID2
VID1
VID0
VID12.5
COMP
FB
IDROOP
TCOMP
DYNAMIC
VID
D/A
T
PWM
PWM3
PWM
E/A
I_TRIP
OC
I_TOT
CHANNEL
CURRENT
BALANCE
CHANNEL
DETECT
SAMPLE
&
HOLD
PWM4
CHANNEL
CURRENT
SENSE
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
GND
2

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ISL6561
Typical Application - 4-Phase Buck Converter with Rds,on Sensing and External NTC
+5V
VIDPGOOD
FB
IDROOP
VDIFF
COMP REF
DAC
VSEN
RGND
VCC
ENLL
PGOOD
OVP
VID4
VID3
VID2
ISL6561
ISEN1+
ISEN1-
PWM1
PWM2
VID1
VID0
ISEN2+
ISEN2-
PWM3
VID12.5
ISEN3+
ISEN3-
OFS
FS
PWM4
ISEN4+
ISEN4-
RT TCOMP GND EN
+12V
+12V
VCC
BOOT
UGATE
PVCC
PWM
PHASE
HIP6601B
DRIVER
LGATE
GND
VIN
NTC
THERMISTOR
+12V
VCC
BOOT
PVCC
UGATE
PHASE
HIP6601B
PWM DRIVER
LGATE
GND
VIN
+12V
VCC
PVCC
PWM
BOOT
UGATE
HIP6601B
DRIVER
PHASE
LGATE
GND
VIN
µP
LOAD
+12V
VCC
BOOT
UGATE
PVCC
PWM
PHASE
HIP6601B
DRIVER
LGATE
GND
VIN
3

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ISL6561
Typical Application - 4-Phase Buck Converter with Rds,on Sensing and Internal PTC
+5V
VIDPGOOD
FB COMP REF
IDROOP
VDIFF
DAC
VSEN
RGND
VCC
ENLL
PGOOD
OVP
VID4
VID3
ISL6561
ISEN1+
ISEN1-
PWM1
VID2
PWM2
VID1
VID0
ISEN2+
ISEN2-
PWM3
VID12.5
ISEN3+
ISEN3-
OFS
PWM4
FS ISEN4+
ISEN4-
RT TCOMP GND EN
+12V
+12V
VCC
BOOT
UGATE
PVCC
PWM
HIP6601B
DRIVER
PHASE
LGATE
GND
VIN
+12V
VCC
BOOT
PVCC
UGATE
PHASE
HIP6601B
PWM
DRIVER
LGATE
GND
VIN
+12V
VCC
PVCC
PWM
BOOT
UGATE
HIP6601B
DRIVER
PHASE
LGATE
GND
VIN
µP
LOAD
+12V
VCC
BOOT
UGATE
PVCC
PWM
PHASE
HIP6601B
DRIVER
LGATE
GND
VIN
4

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ISL6561
Typical Application - 4-Phase Buck Converter with DCR Sensing and External NTC
+5V
VIDPGOOD
PGOOD
OVP
VID4
VID3
VID2
FB
IDROOP
VDIFF
COMP REF
DAC
VSEN
RGND
VCC
ENLL
ISL6561
ISEN1+
ISEN1-
PWM1
PWM2
VID1
VID0
ISEN2+
ISEN2-
PWM3
VID12.5
ISEN3+
ISEN3-
OFS
FS
PWM4
ISEN4+
ISEN4-
R T TCOMP GND EN
+12V
+12V
VCC
BOOT
UGATE
PVCC
PWM
PHASE
HIP6601B
DRIVER
LGATE
GND
VIN
NTC
THERMISTOR
+12V
VCC
BOOT
PVCC
UGATE
PHASE
HIP6601B
PWM
DRIVER
LGATE
GND
VIN
+12V
VCC
PVCC
PWM
BOOT
UGATE
HIP6601B
DRIVER
PHASE
LGATE
GND
VIN
µP
LOAD
+12V
VCC
BOOT
UGATE
PVCC
PWM
PHASE
HIP6601B
DRIVER
LGATE
GND
VIN
5