intersil ISL6729 DATA SHEET
®
www.BDTIC.com/Intersil
ISL6729
Data Sheet December 1, 2005
Low-Cost Single-Ended Current-Mode
PWM for Microcontroller Based Power
Converters
The ISL6729 pulse width modulating (PWM) current mode
controller is designed for power conversion applications that
are based on a microcontroller or other device which can
generate a digital clock signal at the desired switching
frequency. Similar to the ISL684x family of products, the
ISL6729 provides the basic current mode PWM control
features, but eliminates the error amplifier, the oscillator, and
the reference. An external clock signal applied to the
oscillator input provides the time base and sets the
maximum duty cycle. The reduced feature set is ideal for
those applications where a microcontroller is available to
provide the monitor and control functions. The analog PWM
provides the cycle by cycle peak current mode control,
leaving the monitor and control overhead to the
microcontroller.
Ordering Information
PAR T
NUMBER
ISL6729IB ISL6729IB -40 to 105 8 Ld SOIC M8.15
ISL6729IBZ
(See Note)
ISL6729IU 6729 -40 to 105 8 Ld MSOP M8.118
ISL6729IUZ
(See Note)
Add -T to part number for Tape and Reel packaging.
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.
PAR T
MARKING
6729IBZ -40 to 105 8 Ld SOIC
6729Z -40 to 105 8 Ld MSOP
TEMP.
RANGE (°C) PACKAGE
(Pb-free)
(Pb-free)
PKG.
DWG. #
M8.15
M8.118
FN9152.2
Features
• 5V Operation
• 1A MOSFET gate driver
•400µA startup current
• 30ns propagation delay current sense to output
• Fast transient response with peak current mode control
• Switching frequency to 2MHz
• 20ns rise and fall times with 1nF output load
• Maximum Duty Cycle Determined by Clock Input Duty
Cycle
• Tight tolerance current limit threshold
• Pb-free plus anneal available (RoHS compliant)
Applications
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
• PC Power Supplies
• Isolated Buck and Flyback Regulators
• Boost Regulators
Pinout
ISL6729 (8 LD SOIC, MSOP)
TOP VIEW
COMP
N/C
CS
CLKS
1
2
3
4
8
N/C
7
VDD
6
OUT
5
GND
PART NUMBER RISING UVLO MAX. DUTY CYCLE
ISL6729 4.75V 100%
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 Inc.
Copyright © Intersil Americas Inc. 2004 - 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
Functional Block Diagram
www.BDTIC.com/Intersil
V
DD
2
GND
START/STOP
UV COMPARATOR
+
-
BG
OK
V
+
-
DD
+
CS
COMP
CLK
December 1, 2005
-
100mV
2R
R
+
-
1.1V
CLAMP
PWM
COMPARATOR
SRQ
OUT
Q
ISL6729
FN9152.2
Typical Application - Interleaved Multi-Phase Isolated Converter
www.BDTIC.com/Intersil
VOLTAGE FEEDBACK
5V
VDD
OUT
GND
VDD
OUT
GND
VDD
OUT
GND
8
7
6
54
CURRENT FEEDBACK
8
7
6
54
CURRENT FEEDBACK
8
7
6
54
1COMP
3
CLOCK φ1
CLOCK φ2
MICROCONTROLLER
CLOCK φ3
2
3
CS
CLK
ISL6729
1COMP
2
3
CS
CLK
ISL6729
1COMP
2
3
CS
CLK
ISL6729
ISOLATION
POWER STAGE
POWER STAGE
POWER STAGE
ERROR
AMPLIFIER
VOUT
ISL6729
December 1, 2005
FN9152.2
CURRENT FEEDBACK
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