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®
Data Sheet
March 2003
ISL6556B
FN9097.1
Optimized Multi-Phase PWM Controller
with 6-Bit DAC and Programmable
Internal Temperature Compensation for
VR10.X Application
The ISL6556B 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.
The ISL6556B utilizes rDS(ON) current sensing in each
phase for adaptive voltage positioning (droop), channel-
current balancing, and over-current protection. To ensure
the accuracy of droop, a programmable internal temperature
compensation function is implemented to nullify the effect of
rDS(on) temperature sensitivity.
A unity gain, differential amplifier is provided for remote
voltage sensing. Any potential difference between remote
and local grounds can be eliminated using the remote-sense
amplifier. The precision threshold-sensitive enable input is
available to accurately coordinate the start up of the
ISL6556B with Intersil MOSFET driver IC. 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 ISL6556B uses 5V bias and
has a built-in shunt regulator to allow 12V bias using only a
small external limiting resistor.
Pinouts
32-LEAD QFN
TOP VIEW
VID3 1
VID2 2
VID1 3
VID0 4
VID12.5 5
OFS 6
TCOMP 7
REF 8
24 PWM4
23 ISEN4
22 ISEN2
21 PWM2
20 PWM1
19 ISEN1
18 GND
17 ISEN3
Features
• Precision Multi-Phase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Temperature and Life
- Adjustable Reference-Voltage Offset
• Precision rDS(on) Current Sensing
- Integrated Programmable Temperature Compensation
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Low-Cost, Lossless Current Sensing
• Internal Shunt Regulator for 5V or 12V Biasing
• Microprocessor Voltage Identification Input
- Dynamic VID™ Technology
- 6-Bit VID Input
- 0.8375V to 1.600V in 12.5mV Steps
• Threshold Enable Function for Precision Sequencing
• Over Current Protection
• Over-Voltage Protection
- No Additional External Components Needed
- OVP Pin to drive opitional Crowbar Device
• 2, 3, or 4 Phase Operation up to 1.5MHz per Phase
• 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
Ordering Information
PART NUMBER TEMP. (oC) PACKAGE
ISL6556BCB
0 to 105 28-PIN SOIC
ISL6556BCR
0 to 105 32-PIN QFN
PKG. NO.
M28.3
L32.5X5B
OVP 1
PGOOD 2
VID4 3
VID3 4
VID2 5
VID1 6
VID0 7
VID12.5 8
OFS 9
TCOMP 10
REF 11
FB 12
COMP 13
VDIFF 14
28-PIN SOIC
TOP VIEW
28 FS
27 EN
26 VCC
25 PWM4
24 ISEN4
23 ISEN2
22 PWM2
21 PWM1
20 ISEN1
19 ISEN3
18 PWM3
17 GND
16 RGND
15 VSEN
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. 2002. All Rights Reserved

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ISL6565BCB Block Diagram
ISL6556B
RGND
VSEN
VDIFF PGOOD
OVP
x1
S OVP R
LATCH
Q
VCC
POWER-ON
RESET (POR)
OVP
+200mV
SOFT START
AND
FAULT LOGIC
CLOCK AND
SAWTOOTH
GENERATOR
PWM
OFS
OFFSET
PWM
1.24V
EN
TRI-STATE
FS
PWM1
PWM2
REF
VID4
VID3
VID2
VID1
VID0
VID12.5
COMP
FB
DYNAMIC
VID
D/A
TCOMP
T
PWM
PWM3
PWM
E/A
I_TRIP
OC
I_TOT
CHANNEL
CURRENT
BALANCE
CHANNEL
DETECT
SAMPLE
&
HOLD
PWM4
CHANNEL
CURRENT
SENSE
ISEN1
ISEN2
ISEN3
ISEN4
GND
2

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ISL6565BCR Block Diagram
ISL6556B
RGND
VSEN
VDIFF PGOOD
OVP
x1
S OVP R
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
OFSOUT
REF
OFFSET
VID4
VID3
VID2
VID1
VID0
VID12.5
COMP
FB
DYNAMIC
VID
D/A
TCOMP
T
PWM
PWM2
PWM
PWM3
PWM
E/A
I_TRIP
OC
I_TOT
CHANNEL
CURRENT
BALANCE
CHANNEL
DETECT
SAMPLE
&
HOLD
PWM4
CHANNEL
CURRENT
SENSE
ISEN1
ISEN2
ISEN3
ISEN4
GND
3

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Typical Application of ISL6556BCB
ISL6556B
+12V
+5V
FB
VDIFF
COMP VCC
TCOMP
VSEN
RGND
REF
PGOOD
OVP
ISL6556BCB
VID4
PWM1
ISEN1
VID3
VID2
VID1
PWM2
ISEN2
VID0
VID12.5
PWM3
ISEN3
OFS
FS
GND
RT
PWM4
ISEN4
EN
VID_PGOOD
(BUFFERED)
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
+12V
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
+12V
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
+12V
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
4
VIN
VIN
VIN
VIN
µP
LOAD

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Typical Application of ISL6556BCR
ISL6556B
+12V
+5V
FB
VDIFF
VSEN
RGND
COMP VCC
OFSOUT
TCOMP
PGOOD
OVP
REF
ISL6556BCR
VID4
VID3
VID2
ISEN1
PWM1
PWM2
VID1
ISEN2
VID0
VID12.5
PWM3
ISEN3
OFS
FS
GND ENLL
RT
PWM4
ISEN4
EN
+12V
VID_PGOOD
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
+12V
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
+12V
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
+12V
VCC BOOT
UGATE
PVCC
PHASE
HIP6601B
LGATE
PWM
GND
5
VIN
VIN
VIN
VIN
µP
LOAD