ISL6439(2003) データシートの表示（PDF） - Intersil

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ISL6439
(Rev.:2003)

Single Sync Buck PWM Controller for Broadband Gateway Applications

Intersil 

®

Data Sheet

Single Sync Buck PWM Controller for

Broadband Gateway Applications

The ISL6439 makes easy 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 ISL6439

integrates the control, output adjustment, monitoring and

protection functions into a single package.

The ISL6439 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 6V/µs slew rate which enables high converter

bandwidth for fast transient performance. The resulting

PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by

monitoring the rDS(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

TEMP

PART NUMBER RANGE (oC)

PACKAGE

PKG DWG. #

ISL6439CB

0 to 70 14 lead SOIC M14.15

ISL6439ACB

0 to 70 14 lead SOIC M14.15

ISL6439CR

0 to 70 16 Lead 5x5 QFN L16.5x5B

ISL6439ACR

0 to 70 16 Lead 5x5 QFN L16.5x5B

ISL6439IB

-40 to 85 14 lead SOIC M14.15

ISL6439AIB

-40 to 85 14 lead SOIC M14.15

ISL6439IR

-40 to 85 16 Lead 5x5 QFN L16.5x5B

ISL6439AIR

-40 to 85 16 Lead 5x5 QFN L16.5x5B

ISL6439EVAL1 ISL6439 SOIC Evaluation Board

ISL6439EVAL2 ISL6439 QFN Evaluation Board

ISL6439AEVAL1 ISL6439A SOIC Evaluation Board

ISL6439AEVAL2 ISL6439A QFN Evaluation Board

ISL6439

July 2003

FN9057.3

Features

• Operates from 3.3V to 5V Input

• 0.8V to VIN Output Range

- 0.8V Internal Reference

- ±1.5% Over Load, 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 Overcurrent Protection

- Uses Upper MOSFET’s rDS(on)

• Converter can Source and Sink Current

• Small Converter Size

- Internal Fixed Frequency Oscillator

- ISL6439: 300kHz

- ISL6439A: 600kHz

• Internal Soft-Start

• 14 Pin SOIC or 16 Lead 5x5 QFN

• QFN Package:

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat

No Lead - Package Outline

- Near Chip Scale Package footprint, which improves

PCB efficiency and has a thinner profile

Applications

• Cable Modems, Set Top Boxes, and DSL Modems

• DSP and Core Communications Processor Supplies

• Memory Supplies

• Personal Computer Peripherals

• Industrial Power Supplies

• 3.3V-Input DC-DC Regulators

• Low-Voltage Distributed Power Supplies

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright © Intersil Americas Inc. 2003. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.

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