1
FN9009.6
ISL6520
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 Lead 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 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/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
• Operates from +5V Input
• 0.8V to V
IN
Output Range
- 0.8V Internal Reference
- ±1.5% Over Line Voltage and Temperature
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
• Lossless, Programmable Over-Current Protection
- Uses Upper MOSFET’s r
DS(on)
• Small Converter Size
- 300kHz Fixed Frequency Oscillator
- Internal Soft Start
- 8 Ld SOIC or 16Ld 4mmx4mm QFN
• 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
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Power Supplies for Microprocessors
-PCs
- Embedded Controllers
• Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
• Cable Modems, Set Top Boxes, and DSL Modems
• DSP and Core Communications Processor Supplies
• Memory Supplies
• Personal Computer Peripherals
• Industrial Power Supplies
• 5V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE (°C) PACKAGE
PKG.
DWG. #
ISL6520CB* 6520CB 0 to 70 8 Ld SOIC M8.15
ISL6520CBZ*
(Note)
6520 CBZ 0 to 70 8 Ld SOIC
(Pb-free)
M8.15
ISL6520IB* 6520IB -40 to 85 8 Ld SOIC M8.15
ISL6520IBZ*
(Note)
6520 IBZ -40 to 85 8 Ld SOIC
(Pb-free)
M8.15
ISL6520CR* ISL
6520CR
0 to 70 16 Ld 4x4mm QFN L16.4x4
ISL6520CRZ*
(Note)
65 20CRZ 0 to 70 16 Ld 4x4mm QFN
(Pb-free)
L16.4x4
ISL6520IR* ISL 6520IR -40 to 85 16 Ld 4x4mm QFN L16.4x4
ISL6520IRZ*
(Note)
65 20IRZ -40 to 85 16 Ld 4x4mm QFN
(Pb-free)
L16.4x4
ISL6520EVAL1 Evaluation Board
* Add “-T” 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.
Data Sheet April 3, 2007
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas LLC 2003, 2005, 2006, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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