ISL6528_06 Datasheet, PDF (1/13 Pages) Intersil Corporation – Dual Regulator - Standard Buck PWM and Linear Power Controller

®
Data Sheet
March 9, 2006
ISL6528
FN9038.4
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 ±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.
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL6528CB ISL6528CB 0 to 70 8 Ld SOIC M8.15
ISL6528CB-T ISL6528CB 8Ld SOIC Tape and Reel
ISL6528CBZ 6528CBZ
(See Note)
0 to 70 8 Ld SOIC M8.15
(Pb-free)
ISL6528CBZ-T 6528CBZ 8Ld SOIC Tape and Reel (Pb-free)
(See Note)
ISL6528EVAL1
Evaluation Board
NOTE: Intersil Pb-free plus anneal 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
• Pb-free plus anneal available (RoHS compliant)
• Provides two regulated voltages
- One standard buck PWM
- One linear controller
• Small converter size
- 600kHz constant frequency operation
- Small external component count
• Excellent output voltage regulation
- Both outputs: ±2% over temperature
• Single 5V bias and bootstrap supply
• Output voltage range: 0.8V to 3.3V
• 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 bipolar linear 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)
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.
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