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®
Data Sheet
October 2003
ISL6529A
FN9127
Dual Regulator–Synchronous Rectified
Buck PWM and Linear Power Controller
The ISL6529A provides the power control and protection for
two output voltages in high-performance graphics cards and
other embedded processor applications. The dual-output
controller drives two N-Channel MOSFETs in a synchronous
rectified buck converter topology and one N-Channel
MOSFET in a linear configuration. The ISL6529A provides
both a regulated high current, low voltage supply and an
independent, lower current supply integrated in an 14-lead
SOIC package. The controller is ideal for graphic card
applications where regulation of both the graphics
processing unit (GPU) and memory supplies is required.
The synchronous rectified buck converter incorporates
simple, single feedback loop, voltage-mode control with fast
transient response. Both the switching regulator and linear
regulator provide a maximum static regulation tolerance of
±1% over line, load, and temperature ranges for the
ISL6529AC and ±2% for the ISL6529C. Each output is user-
adjustable by means of external resistors.
An integrated soft-start feature brings both supplies into
regulation in a controlled manner. Each output is monitored
via the FB pins for undervoltage events. If either output
drops below 51.5% of the nominal output level, both
converters are shutdown.
Ordering Information
PART
NUMBER TEMP. RANGE (oC) PACKAGE
PKG.
DWG. #
ISL6529ACB
0 to 70
14 Ld SOIC M14.15
ISL6529ACB-T 14 Ld SOIC Tape and Reel
ISL6529ACR
0 to 70
16 Ld 5x5 QFN L16.5x5B
ISL6529ACR-T 16 Ld 5x5 Tape and Reel
ISL6529EVAL1 Evaluation Board
Features
• Provides two regulated voltages
- One synchronous rectified buck PWM controller
- One linear controller
• Both controllers drive low cost N-Channel MOSFETs
• 12V direct drive saves external components
• Small converter size
- 600kHz constant frequency operation
- Small external component count
• Excellent output voltage regulation
- Both outputs: ±1% over temperature - ISL6529AC
- Both outputs: ±2% over temperature - ISL6529C
• 5V down conversion
• PWM and linear output voltage range: down to 0.8V
• Simple single-loop voltage-mode PWM control design
• Fast PWM converter transient response
- High-bandwidth error amplifier
- Full 0–100% duty ratio
• Linear controller drives N-Channel MOSFET pass transistor
• Fully-adjustable outputs
• Undervoltage fault monitoring on both outputs
• QFN Package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
Applications
Graphics–GPU and memory supplies
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies
Related Literature
• Technical Brief TB363 Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)
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. 2003. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

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Pinouts
ISL6529A (SOIC)
TOP VIEW
LGATE 1
PGND 2
GND 3
5VCC 4
DRIVE2 5
FB2 6
NC 7
14 UGATE
13 12VCC
12 NC
11 NC
10 COMP
9 FB
8 NC
NC = NO INTERNAL CONNECTION
ISL6529A
ISL6529A (QFN)
TOP VIEW
PGND 1
GND 2
5VCC 3
DRIVE2 4
16 15 14 13
12 12VCC
11 NC
10 COMP
9 FB
56 78
NC = NO INTERNAL CONNECTION
2

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Block Diagram
VOLTAGE
REFERENCE
5VCC
POWER-ON
RESET (POR)
FB2
12VCC
DRIVE2
EA2
INHIBIT
SOFT-START
GND
SHUTDOWN
SOFT-
START
AND FAULT
LOGIC
RESTART
+5VCC
OSCILLATOR
UV2
INHIBIT
SOFT-START
EA1
PWM
COMP1
UV1
FB COMP
+5V
GATE
LOGIC
12VCC
UGATE
LGATE
PGND

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Simplified Power System Diagram
+VIN
+12V
+5V
ISL6529A
VOUT2
+
Q3 LINEAR
CONTROLLER
PWM
CONTROLLER
ISL6529A
Q1
VOUT1
+
Q2
Typical Application
+VIN
(+5V or +3.3V)
VOUT2
2.5V
Q3
+
COUT2
+12V
+5V
CBP
5VCC
CBP
12VCC
DRIVE2
+
CIN
UGATE
FB2
ISL6529A
LGATE
Q1
PHASE
LOUT
Q2
FB
COMP
GND
PGND
VOUT1
1.5V
+
COUT1
4

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ISL6529A
Absolute Maximum Ratings
UGATE, LGATE, DRIVE2,. . . . . . . . . . . . . . . GND - 0.3V to 12VCC
5VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +7V
12VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +14V
FB, FB2, COMP, . . . . . . . . . . . . . . . . . GND - 0.3V to 5VCC + 0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 4kV
Operating Conditions
Supply Voltage on 5VCC . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±10%
Supply Voltage on 12VCC . . . . . . . . . . . . . . . . . . . . . . . +12V ±10%
Supply Voltage to drain of Upper MOSFETs . . . +3.3V to +5V ±10%
Ambient Temperature Range. . . . . . . . . . . . . . . . . . . . 0oC to 70oC
Junction Temperature Range . . . . . . . . . . . . . . . . . . 0oC to 125oC
Thermal Information
Thermal Resistance
θJA (oC/W) θJC
SOIC Package (Note 1) . . . . . . . . . . . . . . 68
N/A
QFN Package (Note 2, 3). . . . . . . . . . . . . . 36
6
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 high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
3. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Block and Simplified Power System
Diagrams, and Typical Application Schematic
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
VCC SUPPLY CURRENT
Nominal Supply Current 12VCC
Nominal Supply Current 5VCC
POWER-ON RESET
ICC UGATE, LGATE and DRIVE2 Open
ICC UGATE, LGATE and DRIVE2 Open
- 2.7 3.0 mA
- 3.5 4.5 mA
Rising 5VCC Threshold
12VCC = 12V
4.25 4.4 4.5 V
Falling 5VCCThreshold
12VCC = 12V
3.75 3.82
4.0
V
Rising 12VCC Threshold
5VCC = 5V
9.6 10.3 10.8 V
Falling 12VCCThreshold
5VCC = 5V
9.3 9.6 10.2 V
OSCILLATOR AND SOFT-START
Free Running Frequency
Ramp Amplitude
Soft-Start Interval
REFERENCE VOLTAGE
FOSC
DVOSC
TSS
550 600 650 kHz
- 1.5 - VP-P
3.1 3.45 3.75 ms
Reference Voltage
System Accuracy
VREF
For the ISL6529AC
- 0.800 -
-1.0 - +1.0
V
%
PWM CONTROLLER ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
Slew Rate
FB Input Current
COMP High Output Voltage
COMP Low Output Voltage
COMP High Output, Source Current
COMP Low Output, Sink Current
Undervoltage Level (VFB/VREF)
GBWP
SR
II
VOUT High
VOUT Low
IOUT High
IOUT Low
VUV
RL = 10k, CL = 10pf
RL = 10k, CL = 10pf
RL = 10k, CL = 10pf
VFB = 0.8V
- 80 - dB
- 15 - MHz
- 6 - V/µs
- 20 150 nA
3.0 4.5 - V
- 0.5 1.0 V
-2.5 -3.3
- mA
3.5 5.0
- mA
- 51.5 -
%
5