ISL6439CB Intersil, ISL6439CB Datasheet

IC CNTRLR PWM SYNC BUCK 14-SOIC

ISL6439CB

Manufacturer Part Number
ISL6439CB
Description
IC CNTRLR PWM SYNC BUCK 14-SOIC
Manufacturer
Intersil
Datasheet

Specifications of ISL6439CB

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
325kHz
Duty Cycle
100%
Voltage - Supply
3.3 V ~ 5 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Frequency-max
325kHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ISL6439CB
Manufacturer:
INTERSIL
Quantity:
20 000
Company:
Part Number:
ISL6439CB
Quantity:
50
Part Number:
ISL6439CBZ
Manufacturer:
INTERSIL
Quantity:
20 000
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
step-down 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
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
DS(ON)
of the upper MOSFET to inhibit PWM
®
1
Data Sheet
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Operates from 3.3V to 5V Input
• 0.8V to V
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
• Fast Transient Response
• Lossless, Programmable Overcurrent Protection
• Converter can Source and Sink Current
• Small Converter Size
• Internal Soft-Start
• 14 Pin SOIC or 16 Lead 5x5 QFN
• QFN Package:
• Pb-free (RoHS compliant)
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
- 0.8V Internal Reference
- ±1.5% Over Load, Line Voltage and Temperature
- Voltage-Mode PWM Control
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
- Uses Upper MOSFET’s r
- Internal Fixed Frequency Oscillator
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
- Near Chip Scale Package footprint, which improves
November 5, 2008
No Lead - Package Outline
PCB efficiency and has a thinner profile
- ISL6439: 300kHz
- ISL6439A: 600kHz
All other trademarks mentioned are the property of their respective owners.
Copyright © Intersil Americas Inc. 2003-2004, 2008. All Rights Reserved.
|
IN
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Output Range
ISL6439, ISL6439A
DS(on)
FN9057.5

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ISL6439CB Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | 1-888-INTERSIL or 1-888-468-3774 Intersil (and design registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003-2004, 2008. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ...

Page 2

... CPVOUT 3 CT1 4 5 CT2 OCSET Ordering Information PART NUMBER (See Note) PART MARKING ISL6439CBZ 6439CBZ ISL6439IBZ 6439IBZ ISL6439AIBZ 6439AIBZ ISL6439IRZ ISL6439 IRZ ISL6439AIRZ ISL6439 AIRZ ISL6439EVAL1 ISL6439 SOIC Evaluation Board ISL6439EVAL2 ISL6439 QFN Evaluation Board *Add “-T” suffix to part number for tape and reel packaging. Please refer to TB347 for details on reel specifications. ...

Page 3

Typical Application - 3.3V Input 3. CT1 C PUMP CT2 CPGND GND ENABLE DISABLE 3 ISL6439, ISL6439A VCC OCSET R CPVOUT ISL6439 D BOOT BOOT C BOOT UGATE PHASE LGATE COMP ...

Page 4

Typical Application - 5V Input + N/C DISABLE Block Diagram VCC CT1 CHARGE PUMP CT2 CPGND OCSET 20μ COMP 4 ISL6439, ISL6439A VCC OCSET CT1 CPVOUT ISL6439 D BOOT CT2 BOOT CPGND C BOOT ...

Page 5

... QFN Package (Note 2 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp For Recommended soldering conditions see Tech Brief TB389. SYMBOL TEST CONDITIONS I BIAS ...

Page 6

Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted V PARAMETER GATE DRIVERS Upper Gate Source Current Upper Gate Sink Current Lower Gate Source Current Lower Gate Sink Current PROTECTION / DISABLE OCSET Current Source Disable Threshold Functional Pin Description 14 ...

Page 7

CT1 and CT2 These pins are the connections for the external charge pump capacitor. A minimum of a 0.1μF ceramic capacitor is recommended for proper operation of the IC. CPVOUT This pin represents the output of the charge pump. The ...

Page 8

VIN VCC CPVOUT D1 BOOT C4 Q1 UGATE L PHASE ISL6439 Q2 LGATE FB C1 COMP C2 R2 FIGURE 2. OUTPUT VOLTAGE SELECTION The overcurrent function cycles the soft-start function in a hiccup mode to provide fault protection. A ...

Page 9

Application Guidelines Layout Considerations Layout is very important in high frequency switching converter design. With power devices switching ...

Page 10

OSC DRIVER OSC PWM COMPARATOR - DRIVER ΔV + OSC E REFERENCE ERROR AMP DETAILED COMPENSATION COMPONENTS ...

Page 11

A conservative approach is presented in Equation 6. I BiasAndGate × ------------------------------------ 1.5 × PUMP Output Capacitor Selection An output capacitor is required to filter the output and supply the load transient current. ...

Page 12

Some capacitor series available from reputable manufacturers are surge current tested. MOSFET Selection/Considerations The ISL6439 requires two N-Channel power MOSFETs. These should be selected based upon r requirements, and thermal management ...

Page 13

MOSFET. Initial calculations with V BOOT2 will quickly help narrow the bootstrap capacitor range. For example, consider an upper MOSFET is chosen with a ...

Page 14

Package Outline Drawing L16.5x5B 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 2, 02/08 5.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 14 ...

Page 15

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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