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®
Data Sheet
February 2003
ISL6529
FN9070.2
Dual Regulator–Synchronous Rectified
Buck PWM and Linear Power Controller
The ISL6529 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 ISL6529 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
±2% over line, load, and temperature ranges. 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. NO.
ISL6529CB
0 to 70
14 Ld SOIC M14.15
ISL6529CB-T 14Ld SOIC Tape and Reel
ISL6529CR
0 to 70
16 Ld 5x5 MLFP L16.5x5B
ISL6529CR-T 16 Ld 5x5 Tape and Reel
ISL6529EVAL1 Evaluation Board
Pinouts
ISL6529 (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
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: ±2% over temperature
• 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
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)
ISL6529 (MLFP)
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
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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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
ISL6529
+VIN
+12V
+5V
VOUT2
+
Q1
Q3 LINEAR
CONTROLLER
PWM
VOUT1
CONTROLLER
+
Q2
ISL6529
Typical Application
+VIN
(+5V or +3.3V)
VOUT2
2.5V
Q3
+
COUT2
+12V
+5V
CBP
5VCC
CBP
12VCC
DRIVE2
+
CIN
UGATE
FB2
ISL6529
LGATE
Q1
PHASE
LOUT
Q2
FB
COMP
GND
PGND
VOUT1
1.5V
+
COUT1
3

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ISL6529
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)
SOIC Package (Note 1) . . . . . . . . . . . . . . . . . . . . . .
68
MLFP Package (Note 2). . . . . . . . . . . . . . . . . . . . . .
36
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.
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
- 0.800 -
-2.0 - +2.0
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)
PWM CONTROLLER GATE DRIVERS
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 -
%
UGATE and LGATE Maximum Voltage
UGATE and LGATE Minimum Voltage
UGATE and LGATE Source Current
VHGATE
VLGATE
IGATE
12VCC = 12V
12VCC = 12V
12VCC = 12V
11 12 - V
- 0 0.5 V
- -1 - A
4

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ISL6529
Electrical Specifications
Recommended Operating Conditions, Unless Otherwise Noted. Refer to Block and Simplified Power System
Diagrams, and Typical Application Schematic (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
UGATE and LGATE Sink Current
UGATE and LGATE OUTPUT IMPEDANCE
LINEAR REGULATOR (DRIVE2)
IGATE
RDS(on)
12VCC = 12V
12VCC = 12V
- 1 -A
- 3.1 4.3
DC Gain
Gain-Bandwidth Product
Slew Rate
FB2 Input Current
Drive2 High Output Voltage
Drive2 Low Output Voltage
Drive2 High Output Source Current
Drive2 Low Output Sink Current
Over-Voltage Level (VFB2/VREF)
Under-Voltage Level (VFB2/VREF)
REGULATOR ISOLATION
Change in Linear Regulator Output Voltage3
Change in PWM Regulator Output Voltage3
GBWP
SR
II
VOUT High
VOUT Low
IOUT High
IOUT Low
VOV
VUV
Vout
Vout
RL = 10k, CL = 10pf
RL = 10k, CL = 10pf
RL = 10k, CL = 10pf
VFB2 = 0.8V
Percent of Nominal
Percent of Nominal
Linear Output = 2.5V, 6A Load Change on PWM
PWM Output = 1.5V, 1A Load Change on Linear
-
-
-
-
9.5
-
-0.7
0.85
-
-
-
-
80
15
6
20
10.3
0.1
-1.4
1.2
160
51.5
<0.5
<0.5
- dB
- MHz
- Vs
150 nA
V
1.0 V
- mA
- mA
-%
-%
-%
-%
NOTE:
3. Measured in the evaluation board.
Functional Pin Descriptions
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
LGATE (Pin 1), (Pin 16 MLFP)
Lower gate drive output. Connect to gate of the low-side
MOSFET.
PGND (Pin 2), (Pin 1 MLFP)
This pin is the power ground return for the lower gate driver.
GND (Pin 3), (Pin 2 MLFP)
Signal ground for the IC. All voltage levels are measured with
respect to this pin. Place via close to pin to minimize
impedance path to ground plane.
5VCC (Pin 4), (Pin 3 MLFP)
Provide a well decoupled 5V bias supply for the IC to this
pin. The voltage at this pin is monitored for Power-On Reset
(POR) purposes.
DRIVE2(Pin 5), (Pin 4 MLFP)
Connect this pin to the gate terminal of an external
N-Channel MOSFET transistor. This pin provides the gate
voltage for the linear regulator pass transistor. It also
provides a means of compensating the error amplifier for
applications where the user needs to optimize the regulator
transient response.
FB2 (Pin 6), (Pin 5 MLFP)
Connect the output of the linear regulator to this pin
through a properly sized resistor divider. The voltage at this
pin is regulated to 0.8V. This pin is also monitored for
undervoltage events.
Pulling and holding FB2 above 1.28V shuts down both
regulators. Releasing FB2 initiates soft-start on both regulators.
NC (Pins 7, 8, 11, and 12), (Pins 6, 7, 8, 11, 13 and
15 MLFP)
No internal connection.
FB (Pin 9), (Pin 9 MLFP) and COMP (Pin 10), (Pin
10 MLFP).
FB and COMP are the available external pins of the error
amplifier. The FB pin is the inverting input of the error amplifier
and the COMP pin is the error amplifier output. These pins are
used to compensate the voltage-mode control feedback loop of
the standard synchronous rectified buck converter.
12VCC(Pin 13), (Pin 12 MLFP)
Provides bias voltage for the gate drivers.The voltage at this
pin is monitored for Power-On Reset (POR) purposes.
UGATE (Pin 14), (Pin 14 MLFP)
Connect UGATE to the upper MOSFET gate. This pin
provides the gate drive for the MOSFET.
5