NCP1442, NCP1443,
NCP1444, NCP1445
4.0 A 280 kHz/560 kHz
Boost Regulators
The NCP1442/3/4/5 products are 280 kHz/560 kHz switching
regulators with a high efficiency, 4.0 A integrated switch. These parts
operate over a wide input voltage range, from 2.7 V to 30 V. The
flexibility of the design allows the chips to operate in most power
supply configurations, including boost, flyback, forward, inverting,
and SEPIC. The ICs utilize current mode architecture, which allows
excellent load and line regulation, as well as a practical means for
limiting current. Combining high−frequency operation with a highly
integrated regulator circuit results in an extremely compact power
supply solution. The circuit design includes provisions for features
such as frequency synchronization, shutdown, and feedback controls
for either positive or negative voltage regulation.
1
Part Number
NCP1442
NCP1443
NCP1444
NCP1445
Frequency
280 kHz
280 kHz
560 kHz
560 kHz
Feedback Voltage Polarity
Positive
Negative
Positive
Negative
NC
P144xF
AWLYWW
1
7
PowerFLEX
7−PIN
1
7
7 LEAD, TO−220
NCP1442/4
1. V
C
2. FB
3. TEST
4. GND
5. V
SW
6. SS
7. V
CC
x
A
WL
Y
WW
NCP1443/5
1. V
C
2. TEST
3. NFB
4. GND
5. V
SW
6. SS
7. V
CC
NC
P144xT
AWLYWW
7
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PowerFLEX]
7−PIN
F SUFFIX
CASE 936J
1
7
7 LEAD, TO−220
T SUFFIX
CASE 821P
PIN CONNECTIONS AND
MARKING DIAGRAMS
Features
•
•
•
•
•
•
•
•
Pb−Free Packages are Available*
Integrated Power Switch: 4.0 A Guaranteed
Wide Input Range: 2.7 V to 30 V
High Frequency Allows for Small Components
Minimum External Components
Easy External Synchronization
Built−in Overcurrent Protection
Frequency Foldback Reduces Component Stress During an
Overcurrent Condition
•
Thermal Shutdown with Hysteresis
•
Regulates Either Positive or Negative Output Voltages
•
Shut Down Current: 50
mA
Maximum
Applications
Pin
•
•
•
•
•
Boost Converter
Inverting Converter
Distributed Power
Portable Computers
Battery Powered Systems
= Device Number 2, 3, 4, or 5
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2006
July, 2006
−
Rev. 8
1
Publication Order Number:
NCP1442/D
NCP1442, NCP1443, NCP1444, NCP1445
3.3 V
+
+
+
10
mH
33
mF
33
mF
33
mF
1
7
V
SW
MBRS320T3
V
SW
FB
GND
7.5 k
5
NCP1442/4
V
C
NC
SS
V
CC
5 V
OUT
/1.5 A
22 k
2
3
220 pF
0.01
mF
SS
5.1 k
4
6
+
+
+
33
mF
33
mF
33
mF
GND
GND
Figure 1. Application Diagram
−
NCP1442/4,
3.3 V to 5.0 V/1.5 A Boost Converter
MAXIMUM RATINGS
Rating
Thermal Resistance Junction−to−Air, TO220−7 Version In Air (Socketed)
Thermal Resistance Junction−to−Air, TO220−7 Version
On Cold Plate (25°C)
Thermal Resistance Junction−to−Air, PowerFLEX on 2.1 sq. in. 1 oz.
Junction Temperature Range, T
J
Storage Temperature Range, T
STORAGE
Lead Temperature Soldering: Reflow (Note 1)
ESD, Human Body Model
Value
66.7
1.45
53.8
0 to +150
−65
to +150
230 Peak
2.0
Unit
°C/W
°C/W
°C
°C
°C
kV
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. 60 second maximum above 183°C.
MAXIMUM RATINGS
Pin Name
IC Power Input
Shutdown/Sync
Loop Compensation
Voltage Feedback Input
Negative Feedback Input
(Transient, 10 ms)
Test Pin
Ground
Switch Input
Pin Symbol
V
CC
SS
V
C
FB
(NCP1442/4 only)
NFB
(NCP1443/5 only)
Test
GND
V
SW
V
MAX
30 V
30 V
6.0 V
10 V
10 V
6.0 V
0.3 V
40 V
V
MIN
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−10
V
−0.3
V
−0.3
V
−0.3
V
I
SOURCE
N/A
1.0 mA
10 mA
1.0 mA
1.0 mA
1.0 mA
9.0 A
10 mA
I
SINK
200 mA
1.0 mA
10 mA
1.0 mA
1.0 mA
1.0 mA
10 mA
9.0 A
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2
NCP1442, NCP1443, NCP1444, NCP1445
unless otherwise stated.) (See Note 2)
Characteristic
Positive and Negative Error Amplifiers
FB Reference Voltage (NCP1442/4 only)
NFB Reference Voltage (NCP1443/5 only)
FB Input Current (NCP1442/4 only)
NFB Input Current (NCP1443/5 only)
FB Reference Voltage Line Regulation
(NCP1442/4 only)
NFB Reference Voltage Line Regulation
(NCP1443/5 only)
Positive Error Amp Transconductance
Negative Error Amp Transconductance
Positive Error Amp Gain
Negative Error Amp Gain
V
C
Source Current
V
C
Sink Current
V
C
High Clamp Voltage
V
C
Low Clamp Voltage
V
C
Threshold
Oscillator
Base Operating Frequency
Reduced Operating Frequency
Maximum Duty Cycle
Base Operating Frequency
Reduced Operating Frequency
Maximum Duty Cycle
FB Frequency Shift Threshold
NFB Frequency Shift Threshold
Sync/Shutdown
Sync Range
Sync Range
Sync Pulse Transition Threshold
SS Bias Current
Shutdown Threshold
Shutdown Delay
2.7 V
≤
V
CC
≤
12 V
12 V < V
CC
≤
30 V
NCP1442/3
NCP1444/5
Rise time = 20 ns
SS = 0 V
SS = 3.0 V
−
−
−
−
−10
−
0.50
12
12
500
1000
2.5
−1.0
0.2
0.85
100
40
−
−
−
−
4.0
1.20
500
400
kHz
kHz
V
mA
mA
V
ms
ms
NCP1442/3, FB = 1.0 V or NFB =
−1.9
V
NCP1442/3, FB = 0 V or NFB = 0 V
NCP1442/3
NCP1444/5, FB = 1.0 V or NFB =
−1.9
V
NCP1444/5, FB = 0 V or NFB = 0 V
NCP1444/5
Frequency drops to reduced operating frequency
Frequency drops to reduced operating frequency
240
30
90
480
60
82
0.36
−0.80
280
68
96
560
120
92
0.40
−0.68
320
120
−
640
160
−
0.44
−0.50
kHz
kHz
%
kHz
kHz
%
V
V
V
C
tied to FB; measure at FB
V
C
= 1.25 V
FB = V
REF
NFB = NV
REF
V
C
= FB
V
C
= 1.25 V
I
VC
=
±
25
mA
I
VC
=
±
5.0
mA
(Note 3)
(Note 3)
FB = 1.0 V or NFB =
−1.9
V, V
C
= 1.25 V
FB = 1.5 V or NFB =
−3.1
V, V
C
= 1.25 V
FB = 1.0 V or NFB =
−1.9
V; V
C
sources 25
mA
FB = 1.5 V or NFB =
−3.1
V, V
C
sinks 25
mA
Reduce V
C
from 1.5 V until switching stops
1.246
−2.60
−1.0
−16
−0.03
−0.05
300
115
200
100
−90
200
1.5
0.30
0.70
1.276
−2.475
0.1
−10
0.01
0.01
550
160
500
180
−50
460
1.64
0.47
1.05
1.300
−2.40
1.0
−5.0
0.03
0.05
800
225
−
320
−25
1500
1.9
0.70
1.30
V
V
mA
mA
%/V
%/V
mMho
mMho
V/V
V/V
mA
mA
V
V
V
ELECTRICAL CHARACTERISTICS
(2.7 V < V
CC
< 30 V; 0°C < T
A
< 85°C; 0°C < T
J
< 125°C; For all NCP1442/3/4/5 specifications
Test Conditions
Min
Typ
Max
Unit
2. For the FR4 suffix parts, production testing is performed at 25°C and 85°C; limits at 0°C are guaranteed by design.
3. Guaranteed by design, not 100% tested in production.
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3
NCP1442, NCP1443, NCP1444, NCP1445
ELECTRICAL CHARACTERISTICS
(continued)
(2.7 V < V
CC
< 30 V; 0°C < T
A
< 85°C; 0°C < T
J
< 125°C; For all
NCP1442/3/4/5 specifications unless otherwise stated.) (See Note 2)
Characteristic
Power Switch
Switch Saturation Voltage
I
SWITCH
= 4.0 A
I
SWITCH
= 10 mA, 2.7 V < V
CC
< 12 V
I
SWITCH
= 10 mA,
12 V < V
CC
< 30 V
50% duty cycle (Note 4)
80% duty cycle (Note 4)
FB = 0 V or NFB = 0 V, I
SW
= 4.0 A (Note 4)
2.7 V
≤
V
CC
≤
12 V, 10 mA
≤
I
SW
≤
4.0 A
12 V < V
CC
≤
30 V, 10 mA
≤
I
SW
≤
4.0 A
V
SW
= 40 V, V
CC
= 0V
−
−
−
5.0
4.0
200
−
−
−
0.6
0.14
0.9
6.0
−
250
8.0
10
2.0
1.0
0.5
0.4
8.0
−
300
30
50
20
V
V
V
A
A
ns
mA/A
mA
Test Conditions
Min
Typ
Max
Unit
Switch Current Limit
Minimum Pulse Width
Switch Transconductance,
DI
CC
/
DIV
SW
Switch Leakage
General
Operating Current
Shutdown Mode Current
Minimum Operation Input Voltage
Thermal Shutdown
Thermal Hysteresis
I
SW
= 0
V
C
< 0.8 V, SS = 0 V, 2.7 V
≤
V
CC
≤
12 V
V
C
< 0.8 V, SS = 0 V, 12 V
≤
V
CC
≤
30 V
V
SW
switching, maximum I
SW =
10 mA
(Note 4)
(Note 4)
−
−
−
−
150
−
15
16
25
2.2
180
25
27
60
60
2.6
210
−
mA
mA
V
°C
°C
4. Guaranteed by design, not 100% tested in production.
PACKAGE PIN DESCRIPTION
Package Pin Number
1
Pin Symbol
V
C
Function
Loop compensation pin. The V
C
pin is the output of the error amplifier and is used for loop
compensation, current limit and soft start. Loop compensation can be implemented by a sim-
ple RC network as shown in the application diagram on page 2.
Positive regulator feedback pin. This pin senses a positive output voltage and is referenced to
1.276 V. When the voltage at this pin falls below 0.4 V, chip switching frequency reduces to
20% of the nominal frequency.
These pins are connected to internal test logic and should either be left floating or tied to
ground. Connection to a voltage between 2.0 V and 6.0 V shuts down the internal oscillator
and leaves the power switch running.
Negative feedback pin. This pin senses a negative output voltage and is referenced to
−2.475
V. When the voltage at this pin goes above
−0.65
V, chip switching frequency reduces to 20%
of the nominal frequency.
Ground pin. This pin provides a ground for the controller circuitry and the internal power
switch. This pin is internally connected to the metal pad of the package to provide an addition-
al ground connection as well as an effective means of dissipating heat.
High current switch pin. This pin connects internally to the collector of the power switch. The
open voltage across the power switch can be as high as 40 V. To minimize radiation, use a
trace as short as practical.
Synchronization and shutdown pin. This pin may be used to synchronize the part to nearly
twice the base frequency. A TTL low will shut the part down and put it into low current mode.
If synchronization is not used, this pin should be either tied high or left floating for normal
operation.
Input power supply pin. This pin supplies power to the part and should have a bypass capaci-
tor connected to GND.
2 (NCP1442/4 only)
FB
2 (NCP1443/5 only)
3 (NCP1442/4 only)
3 (NCP1443/5 only)
Test
NFB
4
GND
5
V
SW
6
SS
7
V
CC
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4
NCP1442, NCP1443, NCP1444, NCP1445
V
CC
Shutdown
Delay
Timer
SS
Sync
Frequency
Shift 5:1
200 k
2.0 V
NFB
NCP1443/5
only
250 k
Negative
Error Amp
+
−
Thermal
Shutdown
2.0 V
Regulator
Oscillator
S PWM
Latch
R
Q
Driver
Switch
V
SW
×5
Slope
Compensation
15 mW
Ramp
Summer
+
GND
−0.65
V Detector
0.4 V Detector
FB
NCP1442/4
only
−
+
−
PWM
Comparator
1.276 V
Positive
Error Amp
V
C
Figure 2. Block Diagram
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