ISL6520B Datasheet, PDF (1/10 Pages) Intersil Corporation – Single Synchronous Buck Pulse-Width Modulation PWM Controller

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Data Sheet
July 23, 2007
ISL6520B
FN9083.3
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6520B makes simple work out of implementing a
complete control scheme for a DC/DC stepdown converter.
Designed to drive N-channel MOSFETs in a synchronous
buck topology, the ISL6520B integrates the control, output
adjustment and monitoring functions into a single 8 Lead
package.
The ISL6520B 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%.
Ordering Information
PART
NUMBER
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
PKG.
DWG. #
ISL6520BCB* 6520 BCB 0 to +70 8 Ld SOIC M8.15
ISL6520BCBZ* 6520 BCBZ 0 to +70 8 Ld SOIC
(Note)
(Pb-free)
M8.15
ISL6520BCR* 65 20BCR 0 to +70 16 Ld 4x4 QFN L16.4x4
ISL6520BCRZ* 65 20BCRZ 0 to +70 16 Ld 4x4 QFN L16.4x4
(Note)
(Pb-free)
ISL6520BIR* 65 20BIR -40 to +85 16 Ld 4x4 QFN L16.4x4
ISL6520BIRZ* 65 20BIRZ -40 to +85 16 Ld 4x4 QFN L16.4x4
(Note)
(Pb-free)
ISL6520EVAL1 Evaluation Board
*Add “-T” suffix for tape and reel. Please refer to TB347 for details
on reel specifications.
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.
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
• 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
- SSTL-2 and DDR SDRAM Bus Termination Supply
• 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
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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