ISL6520 Datasheet, PDF (1/11 Pages) Intersil Corporation – Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

®
Data Sheet
October 4, 2005
ISL6520
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 ±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/µs 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.
Ordering Information
PART
PART
TEMP.
NUMBER MARKING RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6520CB 6520CB
0 to 70 8 Ld SOIC
M8.15
ISL6520CBZ 6520CBZ
(Note)
0 to 70 8 Ld SOIC (Pb-free) M8.15
ISL6520IB 6520IB
-40 to 85 8 Ld SOIC
M8.15
ISL6520IBZ 6520IBZ
(Note)
-40 to 85 8 Ld SOIC (Pb-free) M8.15
ISL6520CR ISL6520CR 0 to 70 16 Ld 4x4mm QFN L16.4x4
ISL6520IR ISL6520IR -40 to 85 16 Ld 4x4mm QFN 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.
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 4x4mm 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
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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