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ISL6520
Data Sheet
October 4, 2005
FN9009.4
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6520 makes simple work out of implementing a
complete control and protection scheme for a DC/DC
stepdown converter. Designed to drive N-channel MOSFETs
in a synchronous buck topology, the ISL6520 integrates the
control, output adjustment, monitoring and protection
functions into a single 8-pin package.
The ISL6520 provides simple, single feedback loop, voltage-
mode control with fast transient response. The output
voltage can be precisely regulated to as low as 0.8V, with a
maximum tolerance of
鹵1.5%
over temperature and line
voltage variations. A fixed frequency oscillator reduces
design complexity, while balancing typical application cost
and efficiency.
The error amplifier features a 15MHz gain-bandwidth
product and 8V/碌s slew rate which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
Protection from over-current conditions is provided by
monitoring the r
DS(ON)
of the upper MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
Features
鈥?Operates from +5V Input
鈥?0.8V to V
IN
Output Range
- 0.8V Internal Reference
- 鹵1.5% Over Line Voltage and Temperature
鈥?Drives N-Channel MOSFETs
鈥?Simple Single-Loop Control Design
- Voltage-Mode PWM Control
鈥?Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
鈥?Lossless, Programmable Over-Current Protection
- Uses Upper MOSFET鈥檚 r
DS(on)
鈥?Small Converter Size
- 300kHz Fixed Frequency Oscillator
- Internal Soft Start
- 8 Ld SOIC or 16Ld 4x4mm QFN
鈥?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
鈥?Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
PART
NUMBER
ISL6520CB
PART
TEMP.
MARKING RANGE (擄C)
6520CB
0 to 70
0 to 70
-40 to 85
-40 to 85
0 to 70
-40 to 85
PACKAGE
8 Ld SOIC
PKG.
DWG. #
M8.15
Applications
鈥?Power Supplies for Microprocessors
- PCs
- Embedded Controllers
鈥?Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
鈥?Cable Modems, Set Top Boxes, and DSL Modems
ISL6520CBZ 6520CBZ
(Note)
ISL6520IB
6520IB
8 Ld SOIC (Pb-free) M8.15
8 Ld SOIC
M8.15
ISL6520IBZ 6520IBZ
(Note)
ISL6520CR
ISL6520IR
ISL6520CR
ISL6520IR
8 Ld SOIC (Pb-free) M8.15
16 Ld 4x4mm QFN
16 Ld 4x4mm QFN
L16.4x4
L16.4x4
鈥?DSP and Core Communications Processor Supplies
鈥?Memory Supplies
鈥?Personal Computer Peripherals
鈥?Industrial Power Supplies
鈥?5V-Input DC/DC Regulators
鈥?Low-Voltage Distributed Power Supplies
ISL6520EVAL1
Evaluation Board
* Add 鈥?T鈥?suffix for tape and reel.
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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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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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