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TM
Data Sheet
January 2002
ISL6524
FN9015.1
VRM8.5 PWM and Triple Linear Power
System Controller
The ISL6524 provides the power control and protection for
four output voltages in high-performance microprocessor
and computer applications. The IC integrates one PWM
controller and three linear controllers, as well as the
monitoring and protection functions into a 28-pin SOIC
package. The PWM controller regulates the microprocessor
core voltage with a synchronous-rectified buck converter.
One linear controller supplies the computer system’s AGTL+
1.2V bus power. The other two linear controllers regulate
power for the 1.5V AGP bus and the 1.8V power for the chip
set core voltage and/or cache memory circuits.
The ISL6524 includes an Intel VRM8.5 compatible, TTL
5-input digital-to-analog converter (DAC) that adjusts the
microprocessor core-targeted PWM output voltage from
1.050V to 1.825V in 25mV steps. The precision reference
and voltage-mode control provide ±1% static regulation. The
linear regulators use external N-channel MOSFETs or
bipolar NPN pass transistors to provide fixed output voltages
of 1.2V ±3% (VOUT2), 1.5V ±3% (VOUT3) and 1.8V ±3%
(VOUT4).
The ISL6524 monitors all the output voltages. A delayed-
rising VTT (VOUT2 output) Power Good signal is issued
before the core PWM starts to ramp up. Another system
Power Good signal is issued when the core is within ±10% of
the DAC setting and all other outputs are above their under-
voltage levels. Additional built-in overvoltage protection for
the core output uses the lower MOSFET to prevent output
voltages above 115% of the DAC setting. The PWM
controllers’ overcurrent function monitors the output current
by using the voltage drop across the upper MOSFET’s
rDS(ON), eliminating the need for a current sensing resistor.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ISL6524CB
0 to 70 28 Ld SOIC
ISL6524EVAL1
Evaluation Board
PKG.
NO.
M28.3
Features
• Provides 4 Regulated Voltages
- Microprocessor Core, AGTL+ Bus, AGP Bus Power,
and North/South Bridge Core
• Drives N-Channel MOSFETs
• Linear Regulator Drives Compatible with both MOSFET
and Bipolar Series Pass Transistors
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
- Core PWM Output: ±1% Over Temperature
- All Other Outputs: ±3% Over Temperature
• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core
Output Voltage Selection
- Wide Range - 1.050V to 1.825V
• Power-Good Output Voltage Monitors
- Separate delayed VTT Power Good
• Overcurrent Fault Monitor
- Switching Regulator Doesn’t Require Extra Current
Sensing Element, Uses MOSFET’s rDS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Internal Oscillator
Applications
Motherboard Power Regulation for Computers
Pinout
ISL6524 (SOIC)
TOP VIEW
DRIVE2 1
FIX 2
VID3 3
VID2 4
VID1 5
VID0 6
VID25 7
PGOOD 8
VTTPG 9
FAULT/RT 10
VSEN2 11
SS24 12
SS13 13
VSEN4 14
28 VCC
27 UGATE
26 PHASE
25 LGATE
24 PGND
23 OCSET
22 VSEN1
21 FB
20 COMP
19 VSEN3
18 DRIVE3
17 GND
16 VAUX
15 DRIVE4
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. 2002. All Rights Reserved

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Block Diagram
DRIVE3
DRIVE4
VSEN4
FIX
DRIVE2
VSEN2
VSEN3
VSEN1
OCSET
VCC
VAUX
EA3
-
+
+
-
EA4
1.5V or 1.26V
x0.75
x0.75
+ 1.8V or 1.26V
-
- UV3
+
+ UV4
-
x 1.10
x 0.90
x0.90
+
1.2V
-
UV2
SET
Q
CLK
QD
CLR
INHIBIT
-
+ EA2
FAULT
SOFT-
START
AND FAULT
LOGIC
OV
VCC
x 1.15
OSCILLATOR
28µA
4.5V
28µA
4.5V
POWER-ON
RESET (POR)
+ 200µA
-
+
-
+
-
OC +
-
VCC
DRIVE1
+
-
EA1
DACOUT
+
-
PWM
COMP
PWM
GATE
CONTROL
SYNCH
DRIVE
TTL D/A
CONVERTER
(DAC)
VCC
VAUX
PGOOD
UGATE
PHASE
LGATE
PGND
GND
VTTPG
FAULT/RT SS13
SS24
FIGURE 1.
FB COMP VID3 VID2 VID1 VID0 VID25

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+5VIN
VOUT2
Q3
+3.3VIN
VOUT3
Q4
ISL6524
LINEAR
CONTROLLER
PWM1
CONTROLLER
ISL6524
LINEAR
CONTROLLER
LINEAR
CONTROLLER
Q1
VOUT1
Q2
Q5
VOUT4
FIGURE 2. SIMPLIFIED POWER SYSTEM DIAGRAM
+12VIN
+5VIN
LIN
CIN
VCC
VOUT2
1.2V
COUT2
Q3 DRIVE2
FAULT/RT
FIX
VSEN2
OCSET
PGOOD
UGATE
PHASE
LGATE
PGND
POWERGOOD
Q1
LOUT1
VOUT1
1.3V to 3.5V
Q2 COUT1
VTT POWERGOOD
+3.3VIN
VOUT3
1.5V
COUT3
VOUT4
1.8V
COUT4
VTTPG
VAUX
Q4 DRIVE3
VSEN3
DRIVE4
Q5
VSEN4
SS24
CSS24
ISL6524
VSEN1
FB
COMP
GND
VID3
VID2
VID1
VID0
VID25
SS13
CSS13
FIGURE 3. TYPICAL APPLICATION
3

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ISL6524
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+15V
PGOOD, RT/FAULT, DRIVE, PHASE, and
GATE Voltage . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC + 0.3V
Input, Output or I/O Voltage . . . . . . . . . . . . . . . . . . GND -0.3V to 7V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 1
Recommended Operating Conditions
Supply Voltage, VCC . . . . . .
Ambient Temperature Range
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+12V ±10%
0oC to 70oC
Junction Temperature Range. . . . . . . . . . . . . . . . . . . 0oC to 125oC
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (oC/W)
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .
70
Maximum Junction Temperature (Plastic Package) . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Figures 1, 2 and 3
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
VCC SUPPLY CURRENT
Nominal Supply Current
ICC UGATE, LGATE, DRIVE2, DRIVE3, and
DRIVE4 Open
-9-
POWER-ON RESET
Rising VCC Threshold
- - 10.4
Falling VCC Threshold
8.2 -
-
Rising VAUX Threshold
- 2.5 -
VAUX Threshold Hysteresis
- 0.5 -
Rising VOCSET Threshold
OSCILLATOR
- 1.26 -
Free Running Frequency
Total Variation
Ramp Amplitude
DAC REFERENCE
FOSC
VOSC
6k< RT to GND < 200kΩ; Note 2
185 200 215
-15 - +15
- 1.9 -
DAC (VID25-VID3) Input Low Voltage
0.8
DAC (VID25-VID3) Input High Voltage
2.0
DACOUT Voltage Accuracy
-1.0 - +1.0
LINEAR REGULATORS (VOUT2, VOUT3, AND VOUT4)
Regulation Tolerance
-3-
VSEN3 Regulation Voltage
VSEN2 Regulation Voltage
VSEN3 Regulation Voltage
VSEN4 Regulation Voltage
VSEN3, 4 Undervoltage Level
VSEN3, 4 Undervoltage Hysteresis
VREG3 FIX = 0V
VREG2
VREG3 FIX = Open
VREG4 FIX = Open
VSEN3, 4UV VSEN3, 4 Rising
VSEN3, 4 Falling
- 1.26 -
- 1.2 -
- 1.5 -
- 1.8 -
- 75 -
7
Output Drive Current
VAUX-VDRIVE2,3,4 > 0.6V
SYNCHRONOUS PWM CONTROLLER ERROR AMPLIFIER
20 40
-
DC Gain
Note 2
- 88 -
UNITS
mA
V
V
V
V
V
kHz
%
VP-P
V
V
%
%
V
V
V
V
%
%
mA
dB
4

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ISL6524
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Figures 1, 2 and 3 (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
Gain-Bandwidth Product
GBWP Note 2
- 15 - MHz
Slew Rate
SR COMP = 10pF, Note 2
- 6 - V/µs
PWM CONTROLLERS GATE DRIVERS
UGATE Source
UGATE Sink
LGATE Source
LGATE Sink
PROTECTION
IUGATE
RUGATE
ILGATE
RLGATE
VCC = 12V, VUGATE = 6V
VGATE-PHASE = 1V
VCC = 12V, VLGATE = 1V
VLGATE = 1V
-1-
- 1.7 3.5
-1-
- 1.4 3.0
A
A
FAULT Sourcing Current
OCSET Current Source
Soft-Start Current
POWER GOOD
IOVP
IOCSET
ISS13,24
VFAULT/RT = 2.0V
VOCSET = 4.5VDC
VSS13,24 = 2.0VDC
- 8.5 -
170 200 230
- 28 -
mA
µA
µA
VSEN1 Upper Threshold
(VSEN1/DACOUT)
VSEN1 Rising
108 - 110
%
VSEN1 Undervoltage
(VSEN1/DACOUT)
VSEN1 Rising
92 - 94
%
VSEN1 Hysteresis (VSEN1/DACOUT)
VSEN1 Falling
-2-
%
PGOOD Voltage Low
VSEN2 Undervoltage
VPGOOD
IPGOOD = -4mA
VSEN2 Rising
- - 0.8
1.08
V
V
VSEN2 Hysteresis
VSEN2 Falling
- 48 -
mV
VTTPG Voltage Low
NOTE:
2. Guaranteed by design
VVTTPG IVTTPG = -4mA
- - 0.8 V
Typical Performance Curves
1000
100
RT PULLUP
TO +12V
10
RT PULLDOWN TO VSS
10 100
SWITCHING FREQUENCY (kHz)
FIGURE 4. RT RESISTANCE vs FREQUENCY
1000
100
CUGATE = CLGATE = C
VIN = 5V
80 VCC = 12V
C = 4800pF
60
C = 3600pF
40 C = 1500pF
20
C = 660pF
0
100 200 300 400 500 600 700 800 900 1000
SWITCHING FREQUENCY (kHz)
FIGURE 5. BIAS SUPPLY CURRENT vs FREQUENCY
5