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DATASHEET
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
Improved Industry Standard Single-Ended Current Mode PWM Controller
FN9124
Rev 13.00
February 18, 2015
The ISL6840, ISL6841, ISL6842, ISL6843, ISL6844,
ISL6845 family of adjustable frequency, low power, pulse
width modulating (PWM) current mode controllers is
designed for a wide range of power conversion applications
including boost, flyback, and isolated output configurations.
Peak current mode control effectively handles power
transients and provides inherent overcurrent protection.
This advanced BiCMOS design is pin compatible with the
industry standard 384x family of controllers and offers
significantly improved performance. Features include low
operating current, 60µA start-up current, adjustable
operating frequency to 2MHz, and high peak current drive
capability with 20ns rise and fall times.
PART NUMBER
ISL6840
ISL6841
ISL6842
ISL6843
ISL6844
ISL6845
RISING UVLO (V) MAX. DUTY CYCLE (%)
7.0 100
7.0 50
14.4 100
8.4 100
14.4 50
8.4 50
Pinouts
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
(8 LD SOIC, MSOP)
TOP VIEW
COMP 1
FB 2
CS 3
RTCT 4
8 VREF
7 VDD
6 OUT
5 GND
Features
• 1A MOSFET Gate Driver
• 60µA Start-up Current, 100µA Maximum
• 25ns Propagation Delay Current Sense to Output
• Fast Transient Response with Peak Current Mode Control
• Adjustable Switching Frequency to 2MHz
• 20ns Rise and Fall Times with 1nF Output Load
• Trimmed Timing Capacitor Discharge Current for Accurate
Deadtime/Maximum Duty Cycle Control
• High Bandwidth Error Amplifier
• Tight Tolerance Voltage Reference Over Line, Load, and
Temperature
• Tight Tolerance Current Limit Threshold
• Pb-Free 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
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
(8 LD DFN)
TOP VIEW
COMP 1
FB 2
CS 3
RTCT 4
8 VREF
7 VDD
6 OUT
5 GND
FN9124 Rev 13.00
February 18, 2015
Page 1 of 14

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ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
Ordering Information
PART NUMBER
(Note 4)
PART MARKING
TEMP RANGE
(°C)
PACKAGE
PKG. DWG. #
ISL6840IRZ-T (Notes 2, 3)
40Z
-40 to +105
8 Ld 2x3 DFN (Pb-free)
L8.2x3
ISL6840IUZ (Notes 1, 3)
6840Z
-40 to +105
8 Ld MSOP (Pb-free)
M8.118
ISL6841IUZ (Notes 1, 3)
6841Z
-40 to +105
8 Ld MSOP (Pb-free)
M8.118
ISL6842IBZ (Notes 1, 3)
6842 IBZ
-40 to +105
8 Ld SOIC (Pb-free)
M8.15
ISL6842IRZ-T (Notes 2, 3) (No longer 42Z
available, recommended
replacement: ISL6842IBZ-T)
-40 to +105
8 Ld 2x3 DFN (Pb-free)
L8.2x3
ISL6842IUZ (Notes 1, 3) (No longer
available, recommended
replacement: ISL6842IBZ)
6842Z
-40 to +105
8 Ld MSOP (Pb-free)
M8.118
ISL6843IBZ (Notes 1, 3)
6843 IBZ
-40 to +105
8 Ld SOIC (Pb-free)
M8.15
ISL6843IU-T (No longer available,
recommended replacement:
ISL6843IUZ-T)
6843
-40 to +105
8 Ld MSOP
M8.118
ISL6843IUZ (Notes 1, 3)
6843Z
-40 to +105
8 Ld MSOP (Pb-free)
M8.118
ISL6844IBZ (Notes 1, 3) (No longer
available, recommended
replacement: ISL8844AABZ)
6844 IBZ
-40 to +105
8 Ld SOIC (Pb-free)
M8.15
ISL6845IBZ (Notes 1, 3) (No longer
available, recommended
replacement: ISL8845AABZ)
6845 IBZ
-40 to +105
8 Ld SOIC (Pb-free)
M8.15
ISL6841EVAL3Z
Evaluation Board
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. Contact Factory for Availability.
3. 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.
4. For Moisture Sensitivity Level (MSL), please see device information page for ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845.For more
information on MSL please see tech brief TB363.
FN9124 Rev 13.00
February 18, 2015
Page 2 of 14

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Functional Block Diagram
VDD
GND
UVLO
COMPARATOR
+ VDD OK
-
BG +-
2.5V
A
A = 0.5
VREF
5.00V
ENABLE
VREF FAULT -
+
VREF
UV COMPARATOR
4.65V 4.80V
BG
CS
ERROR
AMPLIFIER
+
FB -
COMP
RTCT
VREF
2.6V
0.7V
ON
OSCILLATOR
COMPARATOR
8.4mA
-
+
CLOCK
ON
100mV
PWM
COMPARATOR
+
-
2R
R
1.1V
CLAMP
ISL6841/ISL6844/ISL6845
ONLY
Q
T
Q
SQ
RQ
RESET
DOMINANT
P/N
-40, -41
-42, -44
-43, -45
UVLO ON/OFF
7.0/6.6V
14.3/8.8V
8.4/7.2V
VREF
OUT

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Typical Application - 48V Input Dual Output Flyback
VIN+
36V TO 75V
C1
R3
C2
C4
CR6
R1
C3
Q1
CR5
T1
C21 + C15
R21
C5 CR2
CR4
+
C22
C17 C19
+
C20
+3.3V
+ C16
+1.8V
RETURN
C6 R16 R17 R18
U2 R19
C14
VIN-
R6
Q3
VR1
R4
CR1
R22
R27
U4
R26
COMP VREF
CS VDD
FB OUT
RTCT GND
ISL684x
R10
C8
C13 R15
U3
R20
C12
R13 C11

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Typical Application - Boost Converter
VIN+
L1
Q1
R8 C10
CR1
R4
C1
VIN-
R1 R2
C4
U1
COMP
FB
CS
RTCT
VREF
VDD
OUT
GND
R3
C7
+
C2
+VOUT
C3
RETURN
R5
C9
R7
VIN+
C8
R6
C5
C6