ISL6522A Datasheet, PDF (1/13 Pages) Intersil Corporation – Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller

®
Data Sheet
April 13, 2005
ISL6522A
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
±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/µs slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0–100%.
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.
Ordering Information
TEMP.
PART NUMBER* RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6522ACB
25 to 70 14 Ld SOIC
M14.15
ISL6522ACBZ
(See Note)
25 to 70 14 Ld SOIC
(Pb-free)
M14.15
ISL6522ACR
25 to 70 16 Ld 5x5 QFN L16.5x5B
ISL6522ACRZ
(See Note)
25 to 70 16 Ld 5x5 QFN
(Pb-free)
L16.5x5B
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 “-T” suffix for tape and reel.
Features
• Drives two N-Channel MOSFETs
• Operates from +5V or +12V input
• Simple single-loop control design
- Voltage-mode PWM control
• Fast transient response
- High-bandwidth error amplifier
- Full 0-100% duty ratio
• Excellent output voltage regulation
- 0.8V internal reference
- ±0.5% over line voltage and temperature
• Overcurrent fault monitor
- Does not require extra current sensing element
- Uses MOSFETs r_DS(ON)
• Converter can source and sink current
• Small converter size
- Constant frequency operation
- 200kHz free-running oscillator programmable from
50kHz to over 1MHz
• 14 Ld SOIC and 16 Lead 5x5mm QFN Packages
• 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
• Pb-Free Available (RoHS Compliant)
Applications
• Power supply for Pentium^®, Pentium Pro, PowerPC^® and
AlphaPC™ microprocessors
• High-power 5V to 3.xV DC-DC regulators
• Low-voltage distributed power supplies
1
CCAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003-2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.