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ISL6522A
Data Sheet
April 13, 2005
FN9122.2
Buck and Synchronous Rectifier
Pulse-Width Modulator (PWM) Controller
The ISL6522A provides complete control and protection for
a DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive two
N-Channel MOSFETs in a synchronous rectified buck
topology. The ISL6522A integrates all of the control, output
adjustment, monitoring and protection functions into a single
package.
The output voltage of the converter can be precisely
regulated to as low as 0.8V, with a maximum tolerance of
卤0.5%
over temperature and line voltage variations.
The ISL6522A provides simple, single feedback loop,
voltage-mode control with fast transient response. It includes
a 200kHz free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz. The error
amplifier features a 15MHz gain-bandwidth product and
6V/碌s slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0鈥?00%.
The ISL6522A protects against overcurrent conditions by
inhibiting PWM operation. The ISL6522A monitors the
current by using the r
DS(ON)
of the upper MOSFET which
eliminates the need for a current sensing resistor.
Features
鈥?Drives two N-Channel MOSFETs
鈥?Operates from +5V or +12V input
鈥?Simple single-loop control design
- Voltage-mode PWM control
鈥?Fast transient response
- High-bandwidth error amplifier
- Full 0-100% duty ratio
鈥?Excellent output voltage regulation
- 0.8V internal reference
-
卤0.5%
over line voltage and temperature
鈥?Overcurrent fault monitor
- Does not require extra current sensing element
- Uses MOSFETs r
DS(ON)
鈥?Converter can source and sink current
鈥?Small converter size
- Constant frequency operation
- 200kHz free-running oscillator programmable from
50kHz to over 1MHz
鈥?14 Ld SOIC and 16 Lead 5x5mm QFN Packages
鈥?QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat
No Leads-Product Outline.
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile
鈥?Pb-Free Available (RoHS Compliant)
Ordering Information
PART NUMBER*
ISL6522ACB
ISL6522ACBZ
(See Note)
ISL6522ACR
ISL6522ACRZ
(See Note)
TEMP.
RANGE (掳C)
25 to 70
25 to 70
25 to 70
25 to 70
PACKAGE
14 Ld SOIC
14 Ld SOIC
(Pb-free)
16 Ld 5x5 QFN
16 Ld 5x5 QFN
(Pb-free)
PKG.
DWG. #
M14.15
M14.15
L16.5x5B
L16.5x5B
Applications
鈥?Power supply for Pentium
庐
, Pentium Pro, PowerPC
庐
and
AlphaPC鈩?microprocessors
鈥?High-power 5V to 3.xV DC-DC regulators
鈥?Low-voltage distributed power supplies
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.
*Add 鈥?T鈥?suffix for tape and reel.
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CCAUTION: 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. 2003-2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
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