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Data Sheet
ISL6722A, ISL6723A
September 29, 2015
FN9237.2
Flexible Single Ended Current Mode PWM
Controllers
The ISL6722A and the ISL6723A are low power,
single-ended pulse width modulating (PWM) current mode
controllers designed for a wide range of DC/DC conversion
applications including boost, flyback, and isolated output
configurations. Similar to, and pin compatible with the
ISL6721, the ISL6722A and ISL6723A offer a modified
feature set. The ISL6722A replaces external synchronization
with a low power SLEEP feature that reduces standby
current to under 200µA. The ISL6723A changes the supply
voltage UVLO threshold to 13V. Additionally, the internal
over temperature protection has been removed in both
controllers. Other features remain the same and include a
low power mode during overvoltage and overcurrent
shutdown faults where the supply current drops to 200µA.
An internal 300ms delay timer prevents rapid “hiccup”
behavior when a shutdown fault does occur.
This advanced BiCMOS design features low operating
current, adjustable operating frequency up to 1MHz, and
adjustable soft-start.
Applications
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
• Isolated Buck and Flyback Regulators
• Boost Regulators
Features
• 1A MOSFET Gate Driver
• 100µA Start-up Current
• Fast Transient Response with Peak Current Mode Control
• Adjustable Switching Frequency up to 1MHz
• Low Power Sleep Mode (ISL6722A)
• Low Power Shutdown Mode
• Delayed Restart from OV and OC Shutdown Faults
• Adjustable Slope Compensation
• Adjustable Soft-Start
• Adjustable Overcurrent Shutdown Delay
• Adjustable UV and OV Monitors
• Leading Edge Blanking
• 1% Tolerance Voltage Reference
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinouts
ISL6722A, ISL6723A (16 LD SOIC, TSSOP)
GATE 1
ISENSE 2
SYNC/SLEEP 3
SLOPE 4
UV 5
OV 6
RTCT 7
ISET 8
16 VC
15 PGND
14 VCC
13 VREF
12 LGND
11 SS
10 COMP
9 FB
ISL6722A (16 LD QFN)
16 15 14 13
SYNC/SLEEP 1
SLOPE 2
UV 3
OV 4
12 VCC
11 VREF
10 LGND
9 SS
5678
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 LLC. 2005, 2007, 2015. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

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ISL6722A, ISL6723A
Ordering Information
PART NUMBER*
(Note)
PART
MARKING
TEMP.
RANGE (°C)
PACKAGE
(RoHS Compliant)
PKG. DWG. #
ISL6722AABZ
6722AABZ
-40 to +105
16 Ld SOIC
M16.15
ISL6723AABZ
6723AABZ
(No longer available or supported)
-40 to +105
16 Ld SOIC
M16.15
ISL6722AAVZ
6722AAVZ
-40 to +105
16 Ld TSSOP
M16.173
ISL6722AARZ
22AZ
-40 to +105
16 Ld QFN
L16.3x3B
*Add “-T” suffix 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.
2 FN9237.2
September 29, 2015

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ISL6722A, ISL6723A
Functional Block Diagram (ISL6723A)
VCC
LGND
ISET
ISENSE
5k
SLOPE
COMP
SS
VFB
START/STOP
UV COMPARATOR
VREF
5V
1%
+ ENABLE
-
BG +-
RESTART
DELAY
0.8
SS CHARGE
VOLTAGE CLAMP
SS CHARGED
VREF
+
S
53µA + 100mV
- OC DETECT
+
OVERCURRENT
COMPARATOR
SHTDN
SOFT-START
CHARGE 70µA
CURRENT
ON
OC
FAULT
OC
25µA
+
-
4.375V
SS DCHGON
OVERCURRENT
SHUTDOWN
DELAY
SS CHG
0.1
SS CLAMP
+
-
2.5V
ERROR
AMPLIFIER
+
-
PWM
COMPARATOR
+
-
1/3 100nS START
BLANKING
SS LOW
-
+
FAULT
LATCH
SS LOW 270mV
COMPARATOR
SQ
RQ
SET DOMINANT
VREF
UV COMPARATOR
4.65V -
+
BG
VREF
VREF
SS
15µA
VREF
20k
3.0V/
1.5V
12k
ON
30k
RTCT
VREF
OSCILLATOR
COMPARATOR
-
+
1mA
ON
BI-DIRECTIONAL
SYNCHRONIZATION
OSC IN
CLK OUT
4V
+
-
NO EXT SYNC
2V
-
+
EXT SYNC BLANKING
SYNC IN SYNC OUT
VREF
SQ
RQ
BLANKING
COMPARATOR 3.0V
-
+
+
-
2.50V
-
+
1.45V
36k
OV
UV
VC
GATE
PGND
SYNC
100
4.5k
3 FN9237.2
September 29, 2015

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ISL6722A, ISL6723A
Functional Block Diagram (ISL6722A)
VCC
LGND
SLEEP
ISET
ISENSE
5k
START/STOP
UV COMPARATOR
VREF
5V
+ ENABLE
-
BG +-
RESTART
DELAY
0.8
SS CHARGE
VOLTAGE CLAMP
SS CHARGED
VREF
+
S
53µA + 100mV
- OC DETECT
+
OVERCURRENT
COMPARATOR
SHTDN
SOFT-START
CHARGE
CURRENT 70µA
ON
OC
FAULT
OC
25µA
+
-
4.375V
SS DCHG ON
OVERCURRENT
SHUTDOWN
DELAY
SS CHG
SLOPE
0.1
COMP
SS SS CLAMP
+
-
VFB
2.5V
ERROR
AMPLIFIER
+
-
PWM
COMPARATOR
+
-
1/3 100ns START
BLANKING
SS LOW -
+
SS LOW 270mV
FAULT COMPARATOR
LATCH
SQ
RQ
SET DOMINANT
VREF
VREF
UV COMPARATOR
4.65V -
+
BG
VREF
SS
15µA
VREF
20k
3.0V/
1.5V
12k
ON
30k
OSCILLATOR
COMPARATOR
-
+
1mA
ON
BLANKING
COMPARATO3.R0V
-
+
+
-
2.50V
-
+
1.45V
OV
UV
S Q VC
RQ
GATE
36k
PGND
4 FN9237.2
September 29, 2015

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Typical Application - 48V Input Dual Output Flyback, 3.3V @ 2.5A, 1.8V @ 1.0A
SP1 SP2
VIN+ P9
36V TO 75V
C1
VIN-
R1
R2
SLEEP
R5
R6
Q3
VR1
R24
C2
C18
CR6
C3 TP1
Q1
T1
ISOLATION
XFMR
CR5
R21
C21 + C15
C5 CR2
CR4
C19 +
C17
C22
+
C20
R16 R17
C6 R19
U2
C14
+3.3V
C16
+1.8V
RETURN
R18
R4 R3
R23
R25
Q2 C4
D1
TP3
TP5
D2
R22
TP2
U4
GATE
ISENSE
SLEEP
SLOPE
UV
OV
RTCT
ISET
VC
PGND
VCC
VREF
LGND
SS
COMP
VFB
R8
R10
C7 C8
R7 R11 R12
R9
R15 C13
U3
R20
R26
R27
C9
R13
R14
TP4
C12
C11
C10