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®
Data Sheet
October 8, 2007
ISL6744A
FN6554.0
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.
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL6744AAUZ 6744A
(Note)
-40 to +105 8 Ld MSOP M8.118
(Pb-free)
ISL6744AABZ 6744AABZ
(Note)
-40 to +105 8 Ld SOIC M8.15
(Pb-free)
*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.
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
Pinout
ISL6744A
(SOIC, MSOP)
TOP VIEW
SS 1
RTD 2
CS 3
CT 4
8 VDD
7 OUTB
6 OUTA
5 GND
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. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Internal Architecture
VDD
GND
UVLO
+
-
INTERNAL
BG OT SHUTDOWN
130 - 150 C
VBIAS
5.00 V
VBIAS
RTD
IRTD
VBIAS
160 uA
ON
CT
2.0 V
2.8 V
0.8 V
- PEAK
+
- VALLEY
+
CLK
SQ
RQ
RESET
DOMINANT
IDCH
ON
CS + OC DETECT
0.6 V -
SS COMPARATOR
CT +
-
SS
0.8
FL
Q
T
Q
PWM TOGGLE
SS CLAMP
-
+
VBIAS
4.0 V
+
-
SS CHARGED
SQ
RQ
OC LATCH
VDD
OUTA
VBIAS
ON
OUTB
70uA
+
-
3.9 V
SS
15 uA
Q
50 µS
Q
RETRIGGERABLE
ONE SHOT
SQ
RQ
PWM LATCH
SET
DOMINANT
VBIAS UV
4.65V 4.80V
SS LOW
+ 0.27 V
-
SS
FAULT LATCH
SET DOMINANT
SQ
FL
RQ
-
+
BG
VBIAS

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Typical Application using ISL6744A - 48V Input DC Transformer, 12V @ 8A Output
VIN+
L1
C2
QH
L3
QR1
T1
C13
TP1 R10
C1
T2
CR3
R2
QR2
QL
C14 R11
C11
R8
SP1
+12V
QR3
C9
L2
C8
RTN
QR4
R9
C12
R1
VIN-
TP6
C3
C7
C4
C5
R7
Q5
U4
ISL6700
VDD LO
HB VSS
HO LI
HS HI
CR2
CR1
R5
TP4
R6
TP5
D2
U1
GND
OUTB
OUTA
VDD
SS
CS
CT
RTD
C15
TP2
C10
C18
D1
C6
C16
R12

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ISL6744A
Absolute Maximum Ratings
Supply Voltage, VDD . . . . . . . . . . . . . . . . . . . GND - 0.3V to +20.0V
OUTA, OUTB . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VDD
Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 5V
Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1A
ESD Classification
Human Body Model (Per MIL-STD-883 Method 3015.7) . . .2000V
Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .100V
Charged Device Model (Per EOS/ESD DS5.3, 4/14/93) . . .1000V
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (°C/W)
8 Lead MSOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
128
8 Lead SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
98
Maximum Junction Temperature . . . . . . . . . . . . . . .-55°C to +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
Operating Conditions
Temperature Range
ISL6744AAxx . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Supply Voltage Range (Typical). . . . . . . . . . . . . . . 9VDC to 16VDC
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.
NOTES:
1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2. All voltages are to be measured with respect to GND, unless otherwise specified.
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
schematic. 9V < VD < 16V, RTD = 51.1kΩ, CT = 470pF, TA = -40°C to +105°C (Note 3), Typical values are at
TA = +25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY VOLTAGE
Start-Up Current, IDD
Operating Current, IDD
UVLO START Threshold
VDD < START Threshold
RLOAD, COUTA,B = 0
COUTA,B = 1nF
- - 175 μA
- 2.89 -
mA
- 5 8.5 mA
5.9 6.3 6.6
V
UVLO STOP Threshold
5.3 5.7 6.3
V
Hysteresis
- 0.6 -
V
CURRENT SENSE
Current Limit Threshold
0.55 0.6 0.65
V
CS to OUT Delay
(Note 4)
- 35 - ns
CS Sink Current
8 10 - mA
Input Bias Current
-1 - 1 μA
PULSE WIDTH MODULATOR
Minimum Duty Cycle
Maximum Duty Cycle
CT to SS Comparator Input Gain
SS to SS Comparator Input Gain
VERROR < CT Offset
CT = 470pF, RTD = 51.1kΩ
CT = 470pF, RTD = 1.1kΩ (Note 4)
(Note 4)
(Note 4)
- - 0%
- 94 - %
- 99 - %
- 1 - V/V
- 0.8 - V/V
4 FN6554.0
October 8, 2007

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ISL6744A
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
schematic. 9V < VD < 16V, RTD = 51.1kΩ, CT = 470pF, TA = -40°C to +105°C (Note 3), Typical values are at
TA = +25°C (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
OSCILLATOR
Charge Current
143 156 170
μA
RTD Voltage
Discharge Current Gain
1.925 2 2.075 V
45 - 65 μA/μA
CT Valley Voltage
CT Peak Voltage
SOFT-START
Charging Current
0.75
2.70
45
0.8
2.80
-
0.85
2.90
68
V
V
µA
SS Clamp Voltage
3.8 4.0 4.2
V
Overcurrent Shutdown Threshold Voltage
(Note 4)
- 3.9 -
V
Overcurrent Discharge Current
12 15 23 μA
Reset Threshold Voltage
(Note 4)
0.25 0.27 0.30
V
OUTPUT
High Level Output Voltage (VOH)
Low Level Output Voltage (VOL)
Rise Time
Fall Time
THERMAL PROTECTION
VDD - VOUTA or VOUTB,
IOUT = -100mA
IOUT = 100mA
CGATE = 1nF, VDD = 12V
CGATE = 1nF, VDD = 12V
-
0.5 2.0
V
-
0.5 1.0
V
- 17 60 ns
- 20 60 ns
Thermal Shutdown
(Note 4)
- 145 -
°C
Thermal Shutdown Clear
(Note 4)
- 130 -
°C
Hysteresis, Internal Protection
(Note 4)
- 15 - °C
NOTES:
3. Specifications at -40°C and +105°C are guaranteed by +25°C test with margin limits.
4. Limits established by characterization and are not production tested.
5 FN6554.0
October 8, 2007