ISL6439.pdf 데이터시트 (총 16 페이지) - 파일 다운로드 ISL6439 데이타시트 다운로드

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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
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/s 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.
ISL6439, ISL6439A
September 15, 2015
FN9057.6
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
• 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
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) is a registered trademark of Intersil Americas LLC.
Copyright © Intersil Americas LLC. 2003-2004, 2008, 2015. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

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ISL6439, ISL6439A
Pinouts
ISL6439, ISL6439A
(14 LEAD SOIC)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
CT1 4
CT2 5
OCSET 6
FB 7
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 ENABLE
8 COMP
ISL6439, ISL6439A
(16 LEAD 5x5 QFN)
TOP VIEW
16 15 14 13
CPVOUT 1
CT1 2
CT2 3
OCSET 4
12 PHASE
11 VCC
10 CPGND
9 NC
5678
Ordering Information
PART NUMBER
(See Note)
PART MARKING
TEMP RANGE (°C)
PACKAGE
(RoHS Compliant)
PKG DWG. #
ISL6439CBZ (No longer
available, recommended
replacement: ISL6439IBZ)
6439CBZ
0 to +70
14 lead SOIC
M14.15
ISL6439IBZ
6439IBZ
-40 to +85
14 lead SOIC
M14.15
ISL6439AIBZ
6439AIBZ
-40 to +85
14 lead SOIC
M14.15
ISL6439IRZ (No longer
available or supported)
ISL6439 IRZ
-40 to +85
16 Lead 5x5 QFN
L16.5x5B
ISL6439AIRZ (No longer
available or supported)
ISL6439 AIRZ
-40 to +85
16 Lead 5x5 QFN
L16.5x5B
ISL6439EVAL1
ISL6439 SOIC Evaluation Board
*Add “-T” suffix to part number for tape and reel packaging. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is 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.
2 FN9057.6
September 15, 2015

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ISL6439, ISL6439A
Typical Application - 3.3V Input
3.3V
VIN
DISABLE
CIN
CPUMP
VCC
CT1 OCSET
ROCSET
CBULK
ISL6439
CT2
CPGND
GND
ENABLE
COMP
CPVOUT
BOOT
UGATE
PHASE
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
3 FN9057.6
September 15, 2015

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Typical Application - 5V Input
+5V
VIN
ISL6439, ISL6439A
DISABLE
VCC
CT1 OCSET
ROCSET
N/C CT2
ISL6439
CPVOUT
DBOOT
CPGND
GND
BOOT
UGATE
PHASE
CBOOT
ENABLE
COMP
LGATE
FB
CIN
CBULK
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET
CHARGE
PUMP
20A
+
-
OC
COMPARATOR
POWER-ON
RESET (POR)
SOFTSTART
+
0.8V
-
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
GATE
CONTROL
PWM LOGIC
FB
COMP
OSCILLATOR
FIXED 300kHz or 600kHz
GND
4
ENABLE
BOOT
UGATE
PHASE
LGATE
FN9057.6
September 15, 2015

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ISL6439, ISL6439A
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7V
Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . . . . +6.0V
Input, Output or I/O Voltage . . . . . . . . . . GND - 0.3V to VCC + 0.3V
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.3V ±10%
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°C
Thermal Information
Thermal Resistance
JA (°C/W) JC (°C/W)
SOIC Package (Note 1) . . . . . . . . . . . .
67
N/A
QFN Package (Note 2). . . . . . . . . . . . .
35
5
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.
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. JC, the
“case temp” is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
3. Limits established by characterization and are not production tested.
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted VCC = 3.3V±5% and TA = +25°C
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
VCC SUPPLY CURRENT
Nominal Supply
POWER-ON RESET
IBIAS
6.1 6.9 7.7
Rising CPVOUT POR Threshold
POR Commercial
4.25 4.30 4.42
Industrial
4.10 4.30 4.50
CPVOUT POR Threshold Hysteresis
0.3 0.6 0.9
OSCILLATOR
Frequency
fOSC
IC = ISL6439C, Commercial
IC = ISL6439I, Industrial
275 300 325
250 300 340
IC = ISL6439AC, Commercial
554 600 645
IC = ISL6439AI, Industrial
524 600 650
Ramp Amplitude
REFERENCE
VOSC
- 1.5 -
Reference Voltage Tolerance
- - 1.5
Nominal Reference Voltage
Charge Pump
VREF
- 0.800 -
Nominal Charge Pump Output
Charge Pump Output Regulation
VCPVOUT VVCC = 3.3V, No Load
- 5.1 -
-2-
ERROR AMPLIFIER
DC Gain
Note 3
- 88 -
Gain-Bandwidth Product
GBWP
- 15 -
Slew Rate
SR
-6-
SOFT START
Soft Start Slew Rate
Commercial
6.2 7.3
Industrial
6.2 7.6
UNITS
mA
V
V
V
kHz
kHz
kHz
kHz
VP-P
%
V
V
%
dB
MHz
V/s
ms
ms
5 FN9057.6
September 15, 2015