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ISL6439
Data Sheet
July 2004
FN9057.4
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 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 3.3V to 5V Input
• 0.8V to V
IN
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 r
DS(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
• Pb-free available
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. 2003-2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL6439
Pinouts
14 LEAD SOIC
TOP VIEW
GND 1
LGATE
2
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 ENABLE
8 COMP
Ordering Information
TEMP
PART NUMBER RANGE (
o
C)
ISL6439CB
ISL6439CBZ
(See Note)
ISL6439IB
ISL6439IBZ
(See Note)
ISL6439AIB
ISL6439AIBZ
(See Note)
ISL6439IR
ISL6439IRZ
(See Note)
ISL6439AIR
12 PHASE
11 VCC
10 CPGND
9
5
NC
6
FB
7
COMP
8
ENABLE
NC
PACKAGE
14 lead SOIC
14 lead SOIC
(Pb-free)
14 lead SOIC
14 lead SOIC
(Pb-free)
14 lead SOIC
14 lead SOIC
(Pb-free)
PKG DWG. #
M14.15
M14.15
M14.15
M14.15
M14.15
M14.15
0 to 70
0 to 70
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
CPVOUT 3
CT1 4
CT2 5
OCSET 6
FB 7
16 LEAD 5x5 QFN
TOP VIEW
UGATE
LGATE
BOOT
GND
16 Lead 5x5 QFN L16.5x5B
16 Lead 5x5 QFN L16.5x5B
(Pb-free)
16 Lead 5x5 QFN L16.5x5B
16 Lead 5x5 QFN L16.5x5B
(Pb-free)
16
CPVOUT
CT1
CT2
OCSET
1
2
3
4
15
14
13
ISL6439AIRZ
(See Note)
ISL6439EVAL1
ISL6439EVAL2
ISL6439 SOIC Evaluation Board
ISL6439 QFN Evaluation Board
ISL6439AEVAL1 ISL6439A SOIC Evaluation Board
ISL6439AEVAL2 ISL6439A QFN Evaluation Board
Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is 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-020B.
2
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