®
ISL6529, ISL6529A
Data Sheet
April 12, 2005
FN9070.5
Dual Regulator–Synchronous Rectified
Buck PWM and Linear Power Controllers
The ISL6529, ISL6529A provide the power control and
protection for two output voltages in high-performance
graphics cards and other embedded processor applications.
The dual-output controllers drive two N-Channel MOSFETs
in a synchronous rectified buck converter topology and one
N-Channel MOSFET in a linear configuration. The ISL6529,
ISL6529A provide both a regulated high current, low voltage
supply and an independent, lower current supply integrated
in a 14-lead SOIC package. The controllers are ideal for
graphic card applications where regulation of both the
graphics processing unit (GPU) and memory supplies is
required.
The synchronous rectified buck converters incorporate
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 shut down.
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
•
Pb-Free Available (RoHS Compliant)
Ordering Information
PART NUMBER*
ISL6529ACB
ISL6529ACBZ (Note)
ISL6529ACR
ISL6529ACRZ (Note)
ISL6529CB
ISL6529CBZ (Note)
ISL6529CR
ISL6529CRZ (Note)
ISL6529EVAL1
TEMP.
RANGE (°C)
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
PACKAGE
14 Ld SOIC
PKG.
DWG. #
M14.15
14 Ld SOIC (Pb-free) M14.15
16 Ld 5x5 QFN
16 Ld 5x5 QFN
(Pb-free)
14 Ld SOIC
L16.5x5B
L16.5x5B
M14.15
Applications
• Graphics–GPU and memory supplies
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies
14 Ld SOIC (Pb-free) M14.15
16 Ld 5x5 QFN
16 Ld 5x5 QFN
(Pb-free)
L16.5x5B
L16.5x5B
Related Literature
• Technical Brief TB363
Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)
Evaluation Board
*Add
“-T” suffix for tape and reel.
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both
SnPb and Pb-free soldering operations. Intersil Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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. 2002-2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL6529, 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
Thermal Information
Thermal Resistance
θ
JA
(°C/W)
θ
JC
(°C/W)
SOIC Package (Note 1) . . . . . . . . . . . .
68
NA
QFN Package (Notes 2, 3). . . . . . . . . .
36
5
Maximum Junction Temperature (Plastic Package) . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C
(SOIC - Lead Tips Only)
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. . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Junction Temperature Range . . . . . . . . . . . . . . . . . . . 0°C to 125°C
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.
NOTES:
1.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2.
θ
JA
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
θ
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
VCC SUPPLY CURRENT
Nominal Supply Current 12VCC
Nominal Supply Current 5VCC
POWER-ON RESET
Rising 5VCC Threshold
Falling 5VCCThreshold
Rising 12VCC Threshold
Falling 12VCCThreshold
Recommended Operating Conditions, Unless Otherwise Noted. Refer to Block and Simplified Power System
Diagrams, and Typical Application Schematic
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
I
CC
I
CC
UGATE, LGATE and DRIVE2 Open
UGATE, LGATE and DRIVE2 Open
-
-
2.7
3.5
3.0
4.5
mA
mA
12VCC = 12V
12VCC = 12V
5VCC = 5V
5VCC = 5V
4.25
3.75
9.6
9.3
4.4
3.82
10.3
9.6
4.5
4.0
10.8
10.2
V
V
V
V
OSCILLATOR AND SOFT-START
Free Running Frequency
Ramp Amplitude
Soft-Start Interval
REFERENCE VOLTAGE
Reference Voltage
System Accuracy
V
REF
ISL6529C
ISL6529AC
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
GBWP
SR
I
I
V
OUT
High
V
OUT
Low
I
OUT
High
R
L
= 10K, C
L
= 10pF
R
L
= 10K, C
L
= 10pF
R
L
= 10K, C
L
= 10pF
V
FB
= 0.8V
-
-
-
-
3.0
-
-2.5
80
15
6
20
4.5
0.5
-6.8
-
-
-
150
-
1.0
-
dB
MHz
V/µs
nA
V
V
mA
-
-2.0
-1.0
0.800
-
-
-
+2.0
+1.0
V
%
%
F
OSC
DV
OSC
T
SS
550
-
3.1
600
1.5
3.45
650
-
3.75
kHz
V
P-P
ms
5
FN9070.5
April 12, 2005
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