®
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.
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