intersil ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A DATA SHEET
...
®
www.BDTIC.com/Intersil
ISL8840A, ISL8841A, ISL8842A,
ISL8843A, ISL8844A, ISL8845A
Data Sheet April 18, 2007
High Performance Industry Standard
Single-Ended Current Mode PWM
Controller
The ISL884xA is a high performance drop-in replacement for
the popular 28C4x and 18C4x PWM controllers suitable for a
wide range of power conversion applications including
boost, flyback, and isolated output configurations. Its fast
signal propagation and output switching characteristics
make this an ideal product for existing and new designs.
Features include 30V operation, low operating current, 90μA
start-up current, adjustable operating frequency to 2MHz,
and high peak current drive capability with 20ns rise and fall
times.
PART NUMBER RISING UVLO MAX. DUTY CYCLE
ISL8840A 7.0 100%
ISL8841A 7.0 50%
ISL8842A 14.4V 100%
ISL8843A 8.4V 100%
ISL8844A 14.4V 50%
ISL8845A 8.4V 50%
Pinout
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
(8 LD SOIC, MSOP)
TOP VIEW
COMP
FB
CS
RTCT
1
2
3
4
8
7
5
6
VREF
VDD
OUT
GND
FN6320.3
Features
• 1A MOSFET gate driver
•90μA start-up current, 125μA maximum
• 35ns propagation delay current sense to output
• Fast transient response with peak current mode control
• 30V operation
• 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
• 1.5MHz bandwidth error amplifier
• Tight tolerance voltage reference over line, load and
temperature
• ±3% current limit threshold
• Pb-free plus anneal available and ELV, WEEE, 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
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. 2005, 2006, 2007. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
www.BDTIC.com/Intersil
Ordering Information
PART
NUMBER*
ISL8840AABZ
(See Note)
ISL8840AAUZ
(See Note)
ISL8840AMBZ
(See Note)
ISL8840AMUZ
(See Note)
ISL8841AABZ
(See Note)
ISL8841AAUZ
(See Note)
ISL8841AMBZ
(See Note)
ISL8841AMUZ
(See Note)
ISL8842AABZ
(See Note)
ISL8842AAUZ
(See Note)
ISL8842AMBZ
(See Note)
ISL8842AMUZ
(See Note)
ISL8843AABZ
(See Note)
ISL8843AAUZ
(See Note)
PART
MARKING
8840 AABZ -40 to +105 8 Ld SOIC M8.15
40AAZ -40 to +105 8 Ld MSOP M8.118
8840 AMBZ -55 to +125 8 Ld SOIC M8.15
40AMZ -55 to +125 8 Ld MSOP M8.118
8841 AABZ -40 to +105 8 Ld SOIC M8.15
41AAZ -40 to +105 8 Ld MSOP M8.118
8841 AMBZ -55 to +125 8 Ld SOIC M8.15
41AMZ -55 to +125 8 Ld MSOP M8.118
8842 AABZ -40 to +105 8 Ld SOIC M8.15
42AAZ -40 to +105 8 Ld MSOP M8.118
8842 AMBZ -55 to +125 8 Ld SOIC M8.15
42AMZ -55 to +125 8 Ld MSOP M8.118
8843 AABZ -40 to +105 8 Ld SOIC M8.15
43AAZ -40 to +105 8 Ld MSOP M8.118
TEMP.
RANGE (°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
Ordering Information (Continued)
PART
NUMBER*
ISL8843AMBZ
(See Note)
ISL8843AMUZ
(See Note)
ISL8844AABZ
(See Note)
ISL8844AAUZ
(See Note)
ISL8844AMBZ
(See Note)
ISL8844AMUZ
(See Note)
ISL8845AABZ
(See Note)
ISL8845AAUZ
(See Note)
ISL8845AMBZ
(See Note)
ISL8845AMUZ
(See Note)
*Add “-T” suffix for tape and reel.
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.
PART
MARKING
8843 AMBZ -55 to +125 8 Ld SOIC M8.15
43AMZ -55 to +125 8 Ld MSOP M8.118
8844 AABZ -40 to +105 8 Ld SOIC M8.15
44AAZ -40 to +105 8 Ld MSOP M8.118
8844 AMBZ -55 to +125 8 Ld SOIC M8.15
44AMZ -55 to +125 8 Ld MSOP M8.118
8845 AABZ -40 to +105 8 Ld SOIC M8.15
45AAZ -40 to +105 8 Ld MSOP M8.118
8845 AMBZ -55 to +125 8 Ld SOIC M8.15
45AMZ -55 to +125 8 Ld MSOP M8.118
TEMP.
RANGE (°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
2
FN6320.3
April 18, 2007
Functional Block Diagram
www.BDTIC.com/Intersil
V
DD
3
GND
CS
FB
COMP
ERROR
AMPLIFIER
VREF
START/STOP
UV COMPARATOR
+
-
+
-
2.5V
+
-
A
A = 0.5
VF TOTAL = 1.15V
DD
OKV
ENABLE
+
-
100mV
2R
COMPARATOR
R
V
REF
5.00V
PWM
+
-
1.1V
CLAMP
ONLY
ISL8841A/
ISL8844A/
ISL8845A
Q
T
Q
SRQ
Q
RESET
DOMINANT
VREF FAULT
VREF
UV COMPARATOR
4.65V 4.80V
-
+
-
+
36k
VREF
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
OUT
100k
150k
RTCT
April 18, 2007
FN6320.3
2.9V
1.0V
OSCILLATOR
COMPARATOR
8.4mA
ON
<10ns
+
ON
CLOCK
Typical Application - 48V Input Dual Output Flyback
www.BDTIC.com/Intersil
VIN+
4
R1
36V TO 75V
C1
C2
C3
R3
C4
CR6
Q1
C5
CR2
T1
C17
C6
R21
CR5
CR4
C19
+
R16
U2
C21
C15 C16
+
C22
+
C20
R17
R19
C14
R18
+3.3V
+
+1.8V
RETURN
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
R4
-
V
IN
R6
CR1
Q3
VR1
April 18, 2007
FN6320.3
C8
R26
R22
COMP
CS
FB
RTCT
R27
U4
VREF
ISL884xA
R10
V
DD
OUT
GND
R13
U3
C13
R15
R20
C12
C11
Typical Application - Boost Converter
www.BDTIC.com/Intersil
VIN+
R8
L1
CR1
C10
+VOUT
+
C2
C3
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
5
RETURN
R5
R6
C1
Q1
R1
C4
R2
R4
COMP
FB
CS
RTCT
U1
ISL884xA
VREF
VDD
OUT
GND
R7
VIN+
C9
C8
C7
VIN-
April 18, 2007
FN6320.3
R3
C5
C6
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