1
®
FN6554.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL6744A
Intermediate Bus PWM Controller
The ISL6744A is a low cost, primary side, double-ended
controller intended for applications using full and half-bridge
topologies for unregulated DC/DC converters. It is a voltage-
mode PWM controller designed for half-bridge and full-
bridge power supplies. It provides precise control of
switching frequency, adjustable soft-start, precise deadtime
control with deadtimes as low as 35ns, and overcurrent
shutdown. The ISL6744A is identical to the ISL6744, but is
optimized for higher noise environments.
Low start-up and operating currents allow for easy biasing in
both AC/DC and DC/DC applications. This advanced
BiCMOS design features low start-up and operating
currents, adjustable switching frequency up to 1MHz, 1A
FET drivers, and very low propagation delays for a fast
response to overcurrent faults.
Features
• Precision Duty Cycle and Deadtime Control
• 100µA Start-up Current
• Adjustable Delayed Overcurrent Shutdown and Restart
• Adjustable Oscillator Frequency Up to 2MHz
• 1A MOSFET Gate Drivers
• Adjustable Soft-Start
• Internal Over Temperature Protection
• 35ns Control to Output Propagation Delay
• Small Size and Minimal External Component Count
• Input Undervoltage Protection
• Pb-Free (RoHS Compliant)
Applications
• Telecom and Datacom Isolated Power
• DC Transformers
• Bus Converters
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE (°C) PACKAGE
PKG.
DWG. #
ISL6744AAUZ
(Note)
6744A -40 to +105 8 Ld MSOP
(Pb-free)
M8.118
ISL6744AABZ
(Note)
6744AABZ -40 to +105 8 Ld SOIC
(Pb-free)
M8.15
*Add “-T” or “-TK” suffix for tape and reel. 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.
Pinout
ISL6744A
(SOIC, MSOP)
TOP VIEW
SS
1
RTD
CS
CT
GND
OUTA
OUTB
VDD
2
3
4
5
6
7
8
Data Sheet October 8, 2007
