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ISL6840, ISL6841, ISL6842,
ISL6843, ISL6844, ISL6845
Data Sheet
February 23, 2012
FN9124.11
Improved Industry Standard Single-Ended
Current Mode PWM Controller
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
7.0
14.4
8.4
14.4
8.4
100
50
100
100
50
50
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
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
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
(8 LD DFN)
TOP VIEW
COMP
FB
CS
RTCT
VREF
VDD
OUT
GND
1
2
3
4
8
7
6
5
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2004, 2005, 2007, 2008, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
Ordering Information
PART NUMBER
(Note 4)
ISL6840IBZ (Notes 1, 3)
ISL6840IRZ-T (Notes 2, 3)
ISL6840IUZ (Notes 1, 3)
ISL6841IB-T
ISL6841IBZ (Notes 1, 3)
ISL6841IRZ-T (Notes 2, 3)
ISL6841IUZ (Notes 1, 3)
ISL6842IBZ (Notes 1, 3)
ISL6842IRZ-T (Notes 2, 3)
ISL6842IUZ (Notes 1, 3)
ISL6843CBZ (Notes 1, 3)
ISL6843IBZ (Notes 1, 3)
ISL6843IRZ-T (Notes 2, 3)
ISL6843IU-T
ISL6843IUZ (Notes 1, 3)
ISL6844IBZ (Notes 1, 3)
ISL6844IRZ-T (Notes 2, 3)
ISL6844IUZ (Notes 1, 3)
ISL6845IBZ (Notes 1, 3)
ISL6845IRZ-T (Notes 2, 3)
ISL6845IUZ (Notes 1, 3)
ISL6841EVAL3Z
ISL6844EVAL1Z
ISL6844EVAL2Z
ISL6844EVAL3Z
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.
PART MARKING
6840 IBZ
40Z
6840Z
ISL 6841IB
6841 IBZ
41Z
6841Z
6842 IBZ
42Z
6842Z
6843 CBZ
6843 IBZ
43Z
6843
6843Z
6844 IBZ
44Z
6844Z
6845 IBZ
45Z
6845Z
Evaluation Board
Evaluation Board
Evaluation Board
Evaluation Board
TEMP RANGE
(°C)
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
0 to +70
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
-40 to +105
PACKAGE
8 Ld SOIC (Pb-free)
8 Ld 2x3 DFN (Pb-free)
8 Ld MSOP (Pb-free)
8 Ld SOIC
8 Ld SOIC (Pb-free)
8 Ld 2x3 DFN (Pb-free)
8 Ld MSOP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld 2x3 DFN (Pb-free)
8 Ld MSOP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld 2x3 DFN (Pb-free)
8 Ld MSOP
8 Ld MSOP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld 2x3 DFN (Pb-free)
8 Ld MSOP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld 2x3 DFN (Pb-free)
8 Ld MSOP (Pb-free)
PKG. DWG. #
M8.15
L8.2x3
M8.118
M8.15
M8.15
L8.2x3
M8.118
M8.15
L8.2x3
M8.118
M8.15
M8.15
L8.2x3
M8.118
M8.118
M8.15
L8.2x3
M8.118
M8.15
L8.2x3
M8.118
2
FN9124.11
February 23, 2012
Functional Block Diagram
VDD
UVLO
COMPARATOR
ENABLE
+
-
BG +
-
V
DD
OK
V
REF
5.00V
VREF
VREF FAULT
-
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
+
VREF
UV COMPARATOR
4.65V 4.80V
A
2.5V
A = 0.5
BG
PWM
COMPARATOR
CS
+
-
+
-
100mV
ERROR
AMPLIFIER
FB
+
-
2R
1.1V
CLAMP
R
ISL6841/ISL6844/ISL6845
ONLY
Q
T
Q
COMP
OUT
VREF
2.6V
0.7V
ON
OSCILLATOR
COMPARATOR
-
+
8.4mA
FN9124.11
February 23, 2012
S Q
R Q
RESET
DOMINANT
RTCT
CLOCK
P/N
-40, -41
-42, -44
-43, -45
UVLO ON/OFF
7.0/6.6V
14.3/8.8V
8.4/7.2V
ON
+
-
3
GND
Typical Application - 48V Input Dual Output Flyback
CR5
+3.3V
T1
VIN+
C4
R3
C2
C5
CR6
36V TO 75V
C1
R1
C6
C3
Q1
R16
U2
R17
R19
C14
R18
C17
CR4
+
C22
+
C21
R21
+1.8V
+ C15
+ C16
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
CR2
C19
C20
RETURN
4
VIN-
R6
Q3
VR1
FN9124.11
February 23, 2012
R4
R22
U3
R27
C13
R15
R20
U4
R26
COMP
CS
FB
VREF
V DD
OUT
RTCT
GND
ISL684x
R10
CR1
C12
C8
R13
C11
Microchip MCU
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