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ISL6528
Data Sheet
December 28, 2004
FN9038.3
Dual Regulator - Standard Buck PWM
and Linear Power Controller
The ISL6528 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 an N-Channel MOSFET in a standard buck
topology and a NPN pass transistor in a linear configuration.
The ISL6528 provides both a regulated high current, low
voltage supply and an independent, lower current supply
integrated in an 8-lead SOIC package. The controller is ideal
for graphics card applications where both graphics
processing unit (GPU) and memory supplies are required.
The standard buck converter is a 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 卤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 52.5% of the internal reference voltage, both
regulators are shutdown.
Features
鈥?Pb-Free Available (RoHS Compliant)
鈥?Provides two regulated voltages
- One standard buck PWM
- One linear controller
鈥?Small converter size
- 600kHz constant frequency operation
- Small external component count
鈥?Excellent output voltage regulation
- Both outputs: 卤2% over temperature
鈥?Single 5V bias and bootstrap supply
鈥?Output voltage range: 0.8V to 3.3V
鈥?Simple single-loop voltage-mode PWM control design
鈥?Fast PWM converter transient response
- High-bandwidth error amplifier
- Full 0鈥?00% duty ratio
鈥?Linear controller drives bipolar linear pass transistor
鈥?Fully-adjustable outputs
鈥?Undervoltage fault monitoring on both outputs
Applications
鈥?Graphics鈥揋PU and memory supplies
鈥?ASIC power supplies
鈥?Embedded processor and I/O supplies
鈥?DSP supplies
Ordering Information
PART NUMBER TEMP. RANGE (
o
C)
ISL6528CB
ISL6528CB-T
ISL6528CBZ
(See Note)
ISL6528CBZ-T
(See Note)
ISL6528EVAL1
0 to 70
PACKAGE
8 Ld SOIC
PKG.
DWG. #
M8.15
8Ld SOIC Tape and Reel
0 to 70
8 Ld SOIC
(Pb-free)
M8.15
Related Literature
鈥?Technical Brief TB363
Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)
8Ld SOIC Tape and Reel (Pb-free)
Evaluation Board
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.
Pinout
ISL6528
(SOIC)
TOP VIEW
GND 1
VCC 2
DRIVE2 3
FB2 4
8 UGATE
7 BOOT
6 COMP
5 FB
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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