ISL6529A Datasheet, PDF (1/15 Pages) Intersil Corporation – Dual Regulator.Synchronous Rectified Buck PWM and Linear Power Controller

®
Data Sheet
December 28, 2004
ISL6529A
FN9127.1
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
ISL6529ACBZ
(See Note)
0 to 70
14 Ld SOIC
(Pb-free)
M14.15
ISL6529ACR
0 to 70
16 Ld 5x5 QFN L16.5x5B
ISL6529ACRZ
(See Note)
0 to 70
16 Ld 5x5 QFN L16.5x5B
(Pb-free)
ISL6529EVAL1 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.
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)
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.
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