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/

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

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 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

• 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

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