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TM
Data Sheet
ISL6554
November 2001 File Number 9003.1
Microprocessor CORE Voltage Regulator
Using Multi-Phase Buck PWM Control
Without Programmable Droop
The ISL6554 is the first controller in the Intersil Multi-Phase
family without the programmable droop feature. The ISL6554
in combination with the HIP6601A, HIP6602A or HIP6603A
companion gate drivers and Intersil MOSFETs form a
complete solution for high-current, high slew-rate
applications. The ISL6554 regulates output voltage,
balances load currents and provides protective functions for
two to four synchronous-rectified buck-converter channels.
A novel approach to current sensing is used to reduce
overall solution cost. The voltage developed across the lower
MOSFET’s parasitic on-resistance during conduction is
sampled and fed back to the controller. This lossless current-
sensing approach allows the controller to maintain phase-
current balance between the power channels and
overcurrent protection.
A 5-bit DAC allows digital programming of the output voltage
in 25mV steps over a range from 0.95V to 1.70V with a
system accuracy of ±1%. Internal pull ups on each DAC
input make external pull-up resistors unnecessary when
interfacing with open-drain output signals.
The PGOOD signal is held low during Soft-Start until the
output voltage increases to within 4% of the programmed.
When the CORE voltage falls 9% below the programmed
VID level, an undervoltage condition is detected and results
in PGOOD transitioning low.
In the event of an overvoltage condition, The converter shuts
down and turns ON the lower MOSFETs to clamp and
protect the microprocessor. Overcurrent protection reduces
the regulator RMS output current to 41% of the programmed
overcurrent trip value. These features provide monitoring
and protection for the microprocessor and power system.
Features
• Multi-Phase Power Conversion
• Precision Channel Current Balance
- Lossless Current Sampling - Uses rDS(ON)
• Precision CORE Voltage Regulation
- ±1% System Accuracy Over Temperature
- No Programmable Droop
• Microprocessor Voltage Identification Input
- 5-Bit VID Decoder
- 0.95V to 1.70V in 25mV Steps
• Fast Transient Response
• Over Current Protection
• Selection of 2, 3, or 4 Phase Operation
• High Ripple Frequency (80kHz to 2MHz)
Applications
• Power Supply Controller for Intel® Itanium™ Processor
Family
• Voltage Regulator Modules
• Servers and Workstations
Ordering Information
PART NUMBER TEMP. (oC) PACKAGE PKG. NO.
ISL6554CB
0 to 70 20 Ld SOIC M20.3
ISL6554CB-T
20 Ld SOIC Tape and Reel
Pinout
ISL6554 (SOIC)
TOP VIEW
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
FS/DIS 8
GND 9
VSEN 10
20 VCC
19 PGOOD
18 PWM4
17 ISEN4
16 ISEN1
15 PWM1
14 PWM2
13 ISEN2
12 ISEN3
11 PWM3
Intel™ is a trademark of Intel Corporation.
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 trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001. All Rights Reserved
Intel® is a registered trademark of Intel Corporation. Itanium™ is a trademark of Intel Corporation

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Block Diagram
ISL6554
PGOOD
VCC
VSEN
COMP
VID4
VID3
VID2
VID1
VID0
FB
X 0.9
X1.15
UV
+
-
OVP
+
-
OV
LATCH
S
POWER-ON
RESET (POR)
CLOCK AND
SAWTOOTH
GENERATOR
THREE
STATE
+
-
PWM
+
-
SOFT-
START
AND FAULT
LOGIC
+
-
PWM
+
-
+
-
PWM
+
-
D/A
+ E/A
-
+
-
PWM
+
-
CURRENT
CORRECTION
I_TOT
+
+
-+
OC I_TRIP
+
+
PHASE
NUMBER CHANNEL
DETECTOR
FS/EN
PWM1
PWM2
PWM3
PWM4
ISEN1
ISEN2
ISEN3
ISEN4
GND
2

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Simplified Power System Diagram
ISL6554
VSEN
PWM 1
PWM 2
ISL6554
PWM 3
PWM 4
VID
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
MICROPROCESSOR
Functional Pin Description
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
FS/DIS 8
GND 9
VSEN 10
20 VCC
19 PGOOD
18 PWM4
17 ISEN4
16 ISEN1
15 PWM1
14 PWM2
13 ISEN2
12 ISEN3
11 PWM3
VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4)
and VID0 (Pin 5)
Voltage Identification inputs from microprocessor. These
pins respond to TTL and 3.3V logic signals. The ISL6554
decodes VID bits to establish the output voltage. See
Table 1.
COMP (Pin 6)
Output of the internal error amplifier. Connect this pin to the
external feedback and compensation network.
FB (Pin 7)
Inverting input of the internal error amplifier.
FS/DIS (Pin 8)
Channel frequency, FSW, select and disable. A resistor from
this pin to ground sets the switching frequency of the
3
converter. Pulling this pin to ground disables the converter
and three states the PWM outputs. See Figure 10.
GND (Pin 9)
Bias and reference ground. All signals are referenced to this
pin.
VSEN (Pin 10)
Power good monitor input. Connect to the microprocessor-
CORE voltage.
PWM1 (Pin 15), PWM2 (Pin 14), PWM3 (Pin 11) and
PWM4 (Pin 18)
PWM outputs for each driven channel in use. Connect these
pins to the PWM input of a HIP6601/2/3 driver. For systems
which use 3 channels, connect PWM4 high. Two channel
systems connect PWM3 and PWM4 high.
ISEN1 (Pin 16), ISEN2 (Pin 13), ISEN3 (Pin 12) and
ISEN4 (Pin 17)
Current sense inputs from the individual converter channel’s
phase nodes. Unused sense lines MUST be left open.
PGOOD (Pin 19)
Power good. This pin provides a logic-high signal when the
microprocessor CORE voltage is within specified limits and
Soft-Start has timed out.
VCC (Pin 20)
Bias supply. Connect this pin to a 5V supply.

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ISL6554
Typical Application - 2 Phase Converter Using HIP6601 Gate Drivers
+5V
FB COMP
VSEN
VCC
PGOOD
VID4
PWM4
PWM3
PWM2
VID3
VID2
VID1
PWM1
MAIN
CONTROL
ISL6554
VID0
FS/DIS
GND
ISEN4
ISEN3
ISEN2
ISEN1
NC
NC
+12V
PVCC
VCC
BOOT
UGATE
PHASE
PWM
DRIVER
HIP6601
LGATE
GND
+12V
PVCC
BOOT
UGATE
VCC
PWM
DRIVER
HIP6601
PHASE
LGATE
GND
VIN = +5V
VIN = +5V
+VCORE
4

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ISL6554
Typical Application - 4 Phase Converter Using HIP6602 Gate Drivers
+5V
FB
VSEN
COMP
VCC
ISEN1
PGOOD
PWM1
VID4
PWM2
VID3
VID2
VID1
ISEN2
MAIN
CONTROL
ISL6554
VID0
FS/DIS
ISEN3
PWM3
PWM4
GND ISEN4
+12V
VCC
BOOT1
VIN = +12V
UGATE1
PHASE1
LGATE1
DUAL
DRIVER
HIP6602
PVCC
+5V
BOOT2
VIN +12V
PWM1
PWM2
UGATE2
PHASE2
LGATE2
GND
+12V
VCC
BOOT3
V IN+12V
UGATE3
PHASE3
LGATE3
DUAL
DRIVER
HIP6602
PVCC
+5V
BOOT4
VIN +12V
PWM3
PWM4
UGATE4
PHASE4
LGATE4
GND
L01
L02
L03
L04
5
+VCORE