NCP1450ASN33T1G [ONSEMI]
PWM Step−up DC−DC Controller; PWM降压型DC- DC控制器
| 型号： | NCP1450ASN33T1G |
| 厂家： | 
ONSEMI |
| 描述： | PWM Step−up DC−DC Controller |
| 文件： | 总22页 (文件大小：221K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NCP1450A
PWM Step−up DC−DC
Controller
The NCP1450A series are PWM step−up DC−DC switching
controller that are specially designed for powering portable equipment
from one or two cells battery packs. The NCP1450A series have a
driver pin, EXT pin, for connecting to an external transistor. Large
output currents can be obtained by connecting a low ON−resistance
external power transistor to the EXT pin. The device will
automatically skip switching cycles under light load condition to
maintain high efficiency at light loads. With only six external
components, this series allows a simple means to implement highly
efficient converter for large output current applications.
Each device consists of an on−chip Pulse Width Modulation (PWM)
oscillator, PWM controller, phase−compensated error amplifier,
soft−start, voltage reference, and driver for driving external power
transistor. Additionally, a chip enable feature is provided to power
down the converter for extended battery life.
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5
1
TSOP−5
SN SUFFIX
CASE 483
MARKING DIAGRAM AND
PIN CONNECTIONS
The NCP1450A device series are available in the TSOP−5 package
with five standard regulated output voltages. Additional voltages that
range from 1.8 V to 5.0 V in 100 mV steps can be manufactured.
1
2
3
5
CE
OUT
NC
EXT
Features
• High Efficiency 86% at I = 200 mA, V = 2.0 V, V
= 3.0 V
= 5.0 V
O
IN
OUT
GND
4
88% at I = 400 mA, V = 3.0 V, V
O
IN
OUT
• Low Startup Voltage of 0.9 V typical at I = 1.0 mA
O
(Top View)
xxx =Specific Device Marking
• Operation Down to 0.6 V
• Five Standard Voltages: 1.9 V, 2.7 V, 3.0 V, 3.3 V, 5.0 V with High
Accuracy 2.5%
A
Y
W
G
= Assembly Location
= Year
= Work Week
• Low Conversion Ripple
= Pb−Free Package
• High Output Current up to 1000 mA
(Note: Microdot may be in either location)
(3.0 V version at V = 2.0 V, L = 10 ꢀ H, C
= 220 ꢀ F)
IN
OUT
• Fixed Frequency Pulse Width Modulation (PWM) at 180 kHz
• Chip Enable Pin with On−chip 150 nA Pullup Current Source
• Low Profile and Micro Miniature TSOP−5 Package
• Pb−Free Packages are Available
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 3 of this data sheet.
Typical Applications
• Personal Digital Assistant (PDA)
• Electronic Games
• Portable Audio (MP3)
• Digital Still Cameras
• Handheld Instruments
© Semiconductor Components Industries, LLC, 2005
1
Publication Order Number:
December, 2005 − Rev. 7
NCP1450A/D
NCP1450A
V
IN
V
OUT
CE
1
EXT
5
OUT
2
NC
3
GND
4
Figure 1. Typical Step−up Converter Application
OUT
2
Error
Amplifier
EXT
5
PWM
Controller
+
−
Driver
NC
3
Phase
Compensation
180 kHz
Oscillator
Voltage
Reference
Soft−Start
GND
4
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTION
Pin #
Symbol
Pin Description
1
CE
Chip Enable Pin
(1) The chip is enabled if a voltage equal to or greater than 0.9 V is applied.
(2) The chip is disabled if a voltage less than 0.3 V is applied.
(3) The chip is enabled if this pin is left floating.
2
3
4
5
OUT
NC
Output voltage monitor pin and also the power supply pin for the device.
No internal connection to this pin.
Ground pin.
GND
EXT
External transistor drive pin.
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2
NCP1450A
ORDERING INFORMATION (Note 1)
Output
Voltage
Switching
Frequency
†
Device
Marking
Package
Shipping
NCP1450ASN19T1
TSOP−5
1.9 V
DAY
TSOP−5
(Pb−Free)
NCP1450ASN19T1G
NCP1450ASN27T1G
NCP1450ASN27T1
NCP1450ASN30T1
NCP1450ASN30T1G
NCP1450ASN33T1
NCP1450ASN33T1G
NCP1450ASN50T1
NCP1450ASN50T1G
TSOP−5
2.7 V
3.0 V
3.3 V
5.0 V
DAZ
DBA
DBC
DBD
TSOP−5
(Pb−Free)
TSOP−5
3000 Units
on 7 Inch Reel
180 KHz
TSOP−5
(Pb−Free)
TSOP−5
TSOP−5
(Pb−Free)
TSOP−5
TSOP−5
(Pb−Free)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
1. The ordering information lists five standard output voltage device options. Additional devices with output voltage ranging from
1.8 V to 5.0 V in 100 mV increments can be manufactured. Contact your ON Semiconductor representative for availability.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage (Pin 2)
V
OUT
6.0
V
Input/Output Pins
EXT (Pin 5)
EXT Sink/Source Current
V
I
−0.3 to 6.0
−150 to 150
V
mA
EXT
EXT
CE (Pin 1)
Input Voltage Range
Input Current Range
V
I
−0.3 to 6.0
−150 to 150
V
mA
CE
CE
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation @ T = 25°C
P
500
250
mW
°C/W
A
D
Thermal Resistance Junction−to−Air
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
R
ꢁ
JA
T
A
−40 to +85
−40 to +150
−55 to +150
°C
°C
°C
T
J
T
stg
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
2. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM) $2.0 kV per JEDEC standard: JESD22−A114.
Machine Model (MM) $200 V per JEDEC standard: JESD22−A115.
3. Latchup Current Maximum Rating: $150 mA per JEDEC standard: JESD78.
4. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.
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3
NCP1450A
ELECTRICAL CHARACTERISTICS (For all values T = 25°C, unless otherwise noted.)
A
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (V
= V
0.96, Note 5)
f
144
−
180
0.11
80
216
−
kHz
%/°C
%
OUT
SET
OSC
Frequency Temperature Coefficient (T = −40°C to 85°C)
ꢂ f
A
Maximum PWM Duty Cycle (V
= V
0.96)
D
MAX
70
−
90
0.9
−
OUT
SET
Minimum Startup Voltage (I = 0 mA)
V
0.8
V
O
start
Minimum Startup Voltage Temperature Coefficient (T = −40°C to 85°C)
ꢂ V
−
−1.6
0.6
mV/°C
V
A
start
Minimum Operation Hold Voltage (I = 0 mA)
V
−
0.7
250
O
hold
Soft−Start Time (V
= V
Note 6)
t
SS
−
100
ms
OUT
SET,
CE (PIN 1)
CE Input Voltage (V
= V
0.96)
V
OUT
SET
High State, Device Enabled
Low State, Device Disabled
V
V
0.9
−
−
−
−
0.3
CE(high)
CE(low)
CE Input Current (Note 6)
ꢀ
A
High State, Device Enabled (V
Low State, Device Disabled (V
= V = 5.0 V)
I
I
−0.5
0
0
0.15
0.5
0.5
OUT
OUT
CE
CE(high)
= 5.0 V, V = 0 V)
CE
CE(low)
EXT (PIN 5)
EXT “H” Output Current (V
Device Suffix:
19T1
= V
−0.4 V)
I
EXTH
mA
mA
EXT
OUT
−
−
−
−
−
−25.0
−35.0
−37.7
−40.0
−53.7
−20.0
−30.0
−30.0
−30.0
−35.0
27T1
30T1
33T1
50T1
EXT “L” Output Current(V
= 0.4 V)
I
EXTL
EXT
Device Suffix:
19T1
27T1
30T1
33T1
20.0
30.0
30.0
30.0
35.0
38.3
48.0
50.8
52.0
58.2
−
−
−
−
−
50T1
TOTAL DEVICE
Output Voltage
Device Suffix:
19T1
V
OUT
V
1.853
2.633
2.925
3.218
4.875
1.9
2.7
3.0
3.3
5.0
1.948
2.768
3.075
3.383
5.125
27T1
30T1
33T1
50T1
Output Voltage Temperature Coefficient (T = −40 to +85°C)
ꢂ
V
−
150
−
ppm/°C
ꢀ A
A
OUT
Operating Current (V
= V = V 0.96, Note 5)
SET
I
OUT
CE
DD
Device Suffix:
19T1
27T1
30T1
33T1
−
−
−
−
−
55
93
98
103
136
90
140
150
160
220
50T1
Standby Current (V
= V = V
+0.5 V)
I
I
−
−
15
20
ꢀ A
ꢀ A
OUT
CE
SET
STB
Off−State Current (V
= 5.0 V, V = 0 V, T = −40 to +85°C, Note 7)
0.6
1.5
OUT
CE
A
OFF
5. V
means setting of output voltage.
SET
6. This parameter is guaranteed by design.
7. CE pin is integrated with an internal 150 nA pullup current source.
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NCP1450A
2.1
2.0
1.9
1.8
1.7
1.6
3.2
3.1
3.0
2.9
V
V
= 2.5 V
= 2.0 V
IN
V
= 0.9 V
V
= 1.2 V
V
= 1.5 V
V
= 0.9 V
V
IN
= 1.2 V
V
IN
IN
IN
IN
IN
= 1.5 V
IN
NCP1450ASN19T1
L = 10 ꢀ H
Q = NTGS3446T1
NCP1450ASN30T1
L = 10 ꢀ H
Q = NTGS3446T1
= 220 ꢀ F
OUT
T = 25°C
A
2.8
2.7
C
= 220 ꢀ F
C
OUT
T = 25°C
A
0
200
400
600
800
1000
1000
1000
0
200
400
600
800
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 3. NCP1450ASN19T1 Output Voltage
vs. Output Current
Figure 4. NCP1450ASN30T1 Output Voltage
vs. Output Current
5.2
5.1
5.0
4.9
4.8
4.7
100
80
60
40
20
0
V
IN
= 1.5 V
V
V
= 4.5 V
= 4.0 V
IN
V
= 1.2 V
V
IN
= 2.0 V
V
= 1.2 V
IN
IN
IN
V
= 0.9 V
V
IN
= 2.5 V
V
= 3.0 V
V
= 1.5 V
IN
IN
IN
NCP1450ASN50T1
L = 10 ꢀ H
Q = NTGS3446T1
NCP1450ASN19T1
L = 10 ꢀ H
Q = NTGS3446T1
= 220 ꢀ F
OUT
T = 25°C
A
V
IN
= 0.9 V
C
= 220 ꢀ F
C
OUT
T = 25°C
A
0
200
400
600
800
0.01
0.1
1
10
100
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 5. NCP1450ASN50T1 Output Voltage
vs. Output Current
Figure 6. NCP1450ASN19T1 Efficiency vs.
Output Current
100
80
60
40
20
0
100
V
V
V
V
= 4.0 V
= 3.0 V
= 2.5 V
= 2.0 V
V
IN
= 4.5 V
IN
IN
IN
IN
V
IN
= 2.5 V
V
= 2.0 V
IN
80
60
40
20
0
V
= 1.5 V
IN
V
IN
= 1.2 V
V
= 1.5 V
V
IN
= 0.9 V
IN
NCP1450ASN30T1
L = 10 ꢀ H
Q = NTGS3446T1
NCP1450ASN50T1
L = 10 ꢀ H
Q = NTGS3446T1
= 220 ꢀ F
OUT
T = 25°C
A
V
= 1.2 V
IN
C
= 220 ꢀ F
C
OUT
V
IN
= 0.9 V
1
T = 25°C
A
0.01
0.1
10
100
0.01
0.1
1
10
100
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 7. NCP1450ASN30T1 Efficiency vs.
Output Current
Figure 8. NCP1450ASN50T1 Efficiency vs.
Output Current
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NCP1450A
2.1
2.0
1.9
1.8
1.7
1.6
3.2
3.1
3.0
2.9
2.8
2.7
NCP1450ASN19T1
L = 22 ꢀ H
NCP1450ASN30T1
L = 22 ꢀ H
I = 0 mA
O
I
O
= 0 mA
V
IN
= 1.2 V
V
IN
= 1.2 V
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
100
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 9. NCP1450ASN19T1 Output Voltage
vs. Temperature
Figure 10. NCP1450ASN30T1 Output Voltage
vs. Temperature
5.2
5.1
5.0
4.9
4.8
4.7
100
80
60
40
20
0
NCP1450ASN50T1
L = 22 ꢀ H
NCP1450ASN19T1
V
OUT
= 1.9 V x 0.96
I
O
= 0 mA
Open−Loop Test
V
IN
= 1.2 V
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 11. NCP1450ASN50T1 Output Voltage
vs. Temperature
Figure 12. NCP1450ASN19T1 Operating
Current vs. Temperature
140
120
100
80
200
180
160
140
120
100
NCP1450ASN30T1
NCP1450ASN50T1
60
V
OUT
= 3.0 V x 0.96
V
OUT
= 5.0 V x 0.96
Open−Loop Test
Open−Loop Test
−25
40
−50
−25
0
25
50
75
−50
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 13. NCP1450ASN30T1 Operating
Current vs. Temperature
Figure 14. NCP1450ASN50T1 Operating
Current vs. Temperature
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NCP1450A
25
20
15
10
5
25
20
15
10
5
NCP1450ASN19T1
= 1.9 V + 0.5 V
NCP1450ASN30T1
V = 3.0 V + 0.5 V
OUT
V
OUT
Open−Loop Test
Open−Loop Test
0
0
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 15. NCP1450ASN19T1 Standby Current
vs. Temperature
Figure 16. NCP1450ASN30T1 Standby Current
vs. Temperature
25
20
15
10
5
1.0
0.8
0.6
0.4
0.2
0.0
NCP1450ASN19T1
V
V
= 5.0 V
= 0 V
Open−Loop Test
OUT
CE
NCP1450ASN50T1
V
= 5.0 V + 0.5 V
OUT
Open−Loop Test
0
−50
−25
0
25
50
75
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 17. NCP1450ASN50T1 Standby Current
vs. Temperature
Figure 18. NCP1450ASN19T1 Off−State Current
vs. Temperature
1.0
0.8
0.6
0.4
0.2
0.0
1.2
1.0
0.8
0.6
0.4
0.2
NCP1450ASN30T1
NCP1450ASN50T1
= 5.0 V
OUT
= 0 V
CE
Open−Loop Test
V
V
= 5.0 V
= 0 V
Open−Loop Test
V
V
OUT
CE
−50
−25
0
25
50
75
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 19. NCP1450ASN30T1 Off−State Current
vs. Temperature
Figure 20. NCP1450ASN50T1 Off−State Current
vs. Temperature
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NCP1450A
300
250
200
150
100
50
300
250
200
150
100
50
NCP1450ASN19T1
= 1.9 V x 0.96
NCP1450ASN30T1
V = 3.0 V x 0.96
OUT
V
OUT
Open−Loop Test
Open−Loop Test
0
0
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
100
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 21. NCP1450ASN19T1 Oscillator
Frequency vs. Temperature
Figure 22. NCP1450ASN30T1 Oscillator
Frequency vs. Temperature
300
250
200
150
100
50
100
90
80
70
60
50
NCP1450ASN50T1
= 5.0 V x 0.96
Open−Loop Test
NCP1450ASN19T1
V
V
= 1.9 V x 0.96
OUT
OUT
Open−Loop Test
0
−50
40
−50
−25
0
25
50
75
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 23. NCP1450ASN50T1 Oscillator
Frequency vs. Temperature
Figure 24. NCP1450ASN19T1 Maximum Duty
Cycle vs. Temperature
100
90
100
90
80
80
70
70
60
50
60
50
NCP1450ASN30T1
= 3.0 V x 0.96
Open−Loop Test
NCP1450ASN50T1
V
OUT
V
= 5.0 V x 0.96
OUT
Open−Loop Test
40
−50
40
−50
−25
0
25
50
75
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 25. NCP1450ASN30T1 Maximum Duty
Cycle vs. Temperature
Figure 26. NCP1450ASN50T1 Maximum Duty
Cycle vs. Temperature
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NCP1450A
0
−10
−20
−30
−40
−50
−20
−30
−40
−50
−60
−70
NCP1450ASN19T1
NCP1450ASN30T1
V
V
= 1.9 V x 0.96
V
V
= 3.0 V x 0.96
OUT
OUT
= V
− 0.4 V
= V
− 0.4 V
EXT
OUT
EXT
OUT
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
100
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 27. NCP1450ASN19T1 EXT “H” Output
Current vs. Temperature
Figure 28. NCP1450ASN30T1 EXT “H” Output
Current vs. Temperature
−40
−50
−60
−70
−80
−90
50
40
30
20
10
0
NCP1450ASN50T1
NCP1450ASN19T1
V
V
= 5.0 V x 0.96
V
V
= 1.9 V x 0.96
= 0.4 V
OUT
OUT
= V
− 0.4 V
EXT
OUT
EXT
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 29. NCP1450ASN50T1 EXT “H” Output
Current vs. Temperature
Figure 30. NCP1450ASN19T1 EXT “L” Output
Current vs. Temperature
80
70
60
50
40
30
90
80
70
60
NCP1450ASN30T1
NCP1450ASN50T1
V
V
= 3.0 V x 0.96
= 0.4 V
V
V
= 5.0 V x 0.96
= 0.4 V
OUT
OUT
50
40
EXT
EXT
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 31. NCP1450ASN30T1 EXT “L” Output
Current vs. Temperature
Figure 32. NCP1450ASN50T1 EXT “L” Output
Current vs. Temperature
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NCP1450A
25
20
15
10
5
25
20
15
10
5
NCP1450ASN19T1
NCP1450ASN30T1
V
V
= 1.9 V x 0.96
OUT
V
V
= 3.0 V x 0.96
OUT
= V
− 0.4 V
EXT
OUT
= V
− 0.4 V
EXT
OUT
Open−Loop Test
Open−Loop Test
0
0
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
100
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 33. NCP1450ASN19T1 EXT “H”
ON−Resistance vs. Temperature
Figure 34. NCP1450ASN30T1 EXT “H”
ON−Resistance vs. Temperature
25
20
15
10
5
25
20
15
10
5
NCP1450ASN50T1
NCP1450ASN19T1
V
V
= 5.0 V x 0.96
V
V
= 1.9 V x 0.96
= 0.4 V
OUT
OUT
= V
− 0.4 V
EXT
OUT
EXT
Open−Loop Test
Open−Loop Test
0
−50
0
−50
−25
0
25
50
75
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 35. NCP1450ASN50T1 EXT “H”
ON−Resistance vs. Temperature
Figure 36. NCP1450ASN19T1 EXT “L”
ON−Resistance vs. Temperature
25
20
15
10
5
25
20
15
10
5
NCP1450ASN30T1
NCP1450ASN50T1
V
V
= 3.0 V x 0.96
= 0.4 V
V
V
= 5.0 V x 0.96
= 0.4 V
OUT
OUT
EXT
EXT
Open−Loop Test
Open−Loop Test
0
−50
0
−50
−25
0
25
50
75
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 37. NCP1450ASN30T1 EXT “L”
ON−Resistance vs. Temperature
Figure 38. NCP1450ASN50T1 EXT “L”
ON−Resistance vs. Temperature
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10
NCP1450A
1.0
0.8
0.6
0.4
0.2
0.0
1.0
0.8
0.6
0.4
0.2
0.0
V
V
start
V
V
start
NCP1450ASN30T1
L = 22 ꢀ H
NCP1450ASN19T1
L = 22 ꢀ H
C
I
= 0.1 ꢀ F
= 0 mA
OUT
C
= 0.1 ꢀ F
O
OUT
I
O
= 0 mA
hold
hold
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 39. NCP1450ASN19T1 Startup/Hold
Voltage vs. Temperature
Figure 40. NCP1450ASN30T1 Startup/Hold
Voltage vs. Temperature
1.0
0.8
0.6
0.4
0.2
0.0
200
180
160
140
120
100
80
NCP1450ASN19T1
L = 10 ꢀ H
Q = NTGS3446T1
V
V
start
hold
C
= 220 ꢀ F
OUT
V
= 1.5 V
IN
T = 25°C
A
V
IN
= 1.2 V
V
IN
= 0.9 V
60
NCP1450ASN50T1
L = 22 ꢀ H
40
C
= 0.1 ꢀ F
OUT
20
I
O
= 0 mA
0
−50
−25
0
25
50
75
100
0
200
400
600
800
1000
TEMPERATURE (°C)
I , OUTPUT CURRENT (mA)
O
Figure 41. NCP1450ASN50T1 Startup/Hold
Voltage vs. Temperature
Figure 42. NCP1450ASN19T1 Ripple Voltage
vs. Output Current
200
180
160
140
120
100
80
200
180
160
140
120
100
80
NCP1450ASN30T1
L = 10 ꢀ H
Q = NTGS3446T1
NCP1450ASN50T1
L = 10 ꢀ H
Q = NTGS3446T1
V
= 2.0 V
IN
V
IN
= 1.5 V
V
IN
= 1.2 V
C
= 220 ꢀ F
OUT
V
IN
= 2.5 V
C
= 220 ꢀ F
OUT
V
IN
= 0.9 V
T = 25°C
A
T = 25°C
A
V
IN
= 1.2 V
V
IN
= 3.0 V
V
IN
= 0.9 V
V
IN
= 1.5 V
V
IN
= 2.5 V
60
60
V
IN
= 4.5 V
40
40
V
IN
= 2.0 V
V
IN
= 4.0 V
20
20
0
0
0
200
400
600
800
1000
0
200
400
600
800
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 43. NCP1450ASN30T1 Ripple Voltage
vs. Output Current
Figure 44. NCP1450ASN50T1 Ripple Voltage
vs. Output Current
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11
NCP1450A
2.0
1.6
1.2
0.8
0.4
0.0
2.0
1.6
NCP1450ASN19T1
L = 10 ꢀ H
Q = MMJT9410
V
start
V
V
start
C
= 220 ꢀ F
OUT
NCP1450ASN19T1
L = 10 ꢀ H
Q = NTGS3446T1
T = 25°C
A
1.2
0.8
0.4
0.0
C
= 220 ꢀ F
OUT
T = 25°C
A
hold
V
hold
0
0
0
20
40
60
80
100
100
100
0
0
0
20
40
60
80
100
100
100
I , OUTPUT CURRENT (mA)
I , OUTPUT CURRENT (mA)
O
O
Figure 45. NCP1450ASN19T1 Startup/Hold
Voltage vs. Output Current (Using MOSFET)
Figure 46. NCP1450ASN19T1 Startup/Hold
Voltage vs. Output Current (Using BJT)
2.0
1.6
1.2
0.8
0.4
0.0
2.0
1.6
1.2
0.8
0.4
0.0
V
start
V
V
start
NCP1450ASN30T1
L = 10 ꢀ H
Q = NTGS3446T1
C
= 220 ꢀ F
OUT
hold
T = 25°C
A
NCP1450ASN30T1
L = 10 ꢀ H
Q = MMJT9410
= 220 ꢀ F
T = 25°C
V
hold
C
OUT
A
20
40
60
80
20
40
60
80
I , OUTPUT CURRENT (mA)
I , OUTPUT CURRENT (mA)
O
O
Figure 47. NCP1450ASN30T1 Startup/Hold
Voltage vs. Output Current (Using MOSFET)
Figure 48. NCP1450ASN30T1 Startup/Hold
Voltage vs. Output Current (Using BJT)
2.0
1.6
1.2
0.8
0.4
0.0
2.0
1.6
1.2
0.8
0.4
0.0
V
V
V
V
start
start
hold
hold
NCP1450ASN50T1
L = 10 ꢀ H
Q = NTGS3446T1
NCP1450ASN50T1
L = 10 ꢀ H
Q = MMJT9410
= 220 ꢀ F
OUT
T = 25°C
A
C
= 220 ꢀ F
C
OUT
T = 25°C
A
20
40
60
80
20
40
60
80
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 49. NCP1450ASN50T1 Startup/Hold
Voltage vs. Output Current (Using MOSFET)
Figure 50. NCP1450ASN50T1 Startup/Hold
Voltage vs. Output Current (Using BJT)
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NCP1450A
2 ꢀ s/div
2 ꢀ s/div
V
OUT
= 1.9 V, V = 1.2 V, I = 20 mA, L = 10 ꢀ H,
V
OUT
= 1.9 V, V = 1.2 V, I = 500 mA, L = 10 ꢀ H,
IN
O
IN
O
C
= 220 ꢀ F
C
= 220 ꢀ F
OUT
OUT
1. V , 1.0 V/div
1. V , 1.0 V/div
L
L
2. I , 500 mA/div
2. I , 500 mA/div
L
L
3. V , 50 mV/div, AC coupled
OUT
3. V , 50 mV/div, AC coupled
OUT
Figure 51. NCP1450ASN19T1 Operating
Waveforms (Medium Load)
Figure 52. NCP1450ASN19T1 Operating
Waveforms (Heavy Load)
2 ꢀ s/div
2 ꢀ s/div
V
OUT
= 3.0 V, V = 1.8 V, I = 20 mA, L = 10 ꢀ H,
V
OUT
= 3.0 V, V = 1.8 V, I = 500 mA, L = 10 ꢀ H,
IN
O
IN
O
C
= 220 ꢀ F
C
= 220 ꢀ F
OUT
OUT
1. V , 2.0 V/div
1. V , 2.0 V/div
L
L
2. I , 500 mA/div
2. I , 500 mA/div
L
L
3. V , 50 mV/div, AC coupled
OUT
3. V , 50 mV/div, AC coupled
OUT
Figure 53. NCP1450ASN30T1 Operating
Waveforms (Medium Load)
Figure 54. NCP1450ASN30T1 Operating
Waveforms (Heavy Load)
2 ꢀ s/div
2 ꢀ s/div
V
OUT
= 5.0 V, V = 3.0 V, I = 20 mA, L = 10 ꢀ H,
V
OUT
= 5.0 V, V = 3.0 V, I = 500 mA, L = 10 ꢀ H,
IN
O
IN
O
C
= 220 ꢀ F
C
= 220 ꢀ F
OUT
OUT
1. V , 2.0 V/div
1. V , 2.0 V/div
L
L
2. I , 500 mA/div
2. I , 500 mA/div
L
L
3. V , 50 mV/div, AC coupled
OUT
3. V , 50 mV/div, AC coupled
OUT
Figure 55. NCP1450ASN50T1 Operating
Waveforms (Medium Load)
Figure 56. NCP1450ASN50T1 Operating
Waveforms (Heavy Load)
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NCP1450A
V
IN
= 1.5 V, L = 4.7 ꢀ H, C
= 220 ꢀ F
V
IN
= 1.5 V, L = 4.7 ꢀ H, C
= 220 ꢀ F
OUT
OUT
1. V , 1.9 V (AC coupled), 200 mV/div
OUT
1. V , 1.9 V (AC coupled), 200 mV/div
OUT
2. I , 1.0 mA to 100 mA
2. I , 100 mA to 1.0 mA
O
O
Figure 57. NCP1450ASN19T1 Load Transient
Response
Figure 58. NCP1450ASN19T1 Load Transient
Response
V
IN
= 2.0 V, L = 4.7 ꢀ H, C
= 220 ꢀ F
V
IN
= 2.0 V, L = 4.7 ꢀ H, C
= 220 ꢀ F
OUT
OUT
1. V , 3.0 V (AC coupled), 200 mV/div
OUT
1. V , 3.0 V (AC coupled), 200 mV/div
OUT
2. I , 1.0 mA to 100 mA
2. I , 100 mA to 1.0 mA
O
O
Figure 59. NCP1450ASN30T1 Load Transient
Response
Figure 60. NCP1450ASN30T1 Load Transient
Response
V
IN
= 3.0 V, L = 4.7 ꢀ H, C
= 220 ꢀ F
V
IN
= 3.0 V, L = 4.7 ꢀ H, C
= 220 ꢀ F
OUT
OUT
1. V , 5.0 V (AC coupled), 200 mV/div
OUT
1. V , 5.0 V (AC coupled), 200 mV/div
OUT
2. I , 1.0 mA to 100 mA
2. I , 100 mA to 1.0 mA
O
O
Figure 61. NCP1450ASN50T1 Load Transient
Response
Figure 62. NCP1450ASN50T1 Load Transient
Response
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14
NCP1450A
2.1
2.0
1.9
3.2
3.1
3.0
V
IN
= 1.5 V
V
IN
= 2.0 V
V
IN
= 2.5 V
NCP1450ASN19T1
L = 10 ꢀ H
Q = MMJT9410
NCP1450ASN30T1
L = 10 ꢀ H
Q = MMJT9410
V
= 1.5 V
IN
2.9
1.8
1.7
1.6
V
IN
= 0.9 V
V
IN
= 1.2 V
V
IN
= 1.2 V
V
IN
= 0.9 V
R = 560 ꢃ
b
R = 560 ꢃ
b
C = 0.003 ꢀ F
C = 0.003 ꢀ F
b
b
2.8
2.7
C
= 220 ꢀ F
C
= 220 ꢀ F
OUT
OUT
T = 25°C
A
T = 25°C
A
0
200
400
600
800
1000
0
200
400
600
800
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 63. NCP1450ASN19T1 Output Voltage
vs. Output Current (Ext. BJT)
Figure 64. NCP1450ASN30T1 Output Voltage
vs. Output Current (Ext. BJT)
5.2
5.1
5.0
4.9
4.8
4.7
100
80
V
V
= 4.5 V
= 4.0 V
IN
V
= 1.5 V
IN
IN
V
IN
= 1.2 V
V
IN
= 3.0 V
V
= 1.5 V
V
= 2.5 V
IN
IN
60
40
20
0
NCP1450ASN19T1
L = 10 ꢀ H
Q = MMJT9410
NCP1450ASN50T1
L = 10 ꢀ H
V
IN
= 2.0 V
Q = MMJT9410
R = 560 ꢃ
V
= 1.2 V
b
IN
R = 560 ꢃ
b
C = 0.003 ꢀ F
b
V
= 0.9 V
IN
C = 0.003 ꢀ F
b
OUT
C = 220 ꢀ F
OUT
T = 25°C
A
V
IN
= 0.9 V
1
C
= 220 ꢀ F
T = 25°C
A
0
200
400
600
800
1000
0.01
0.1
10
100
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 65. NCP1450ASN50T1 Output Voltage
vs. Output Current (Ext. BJT)
Figure 66. NCP1450ASN19T1 Efficiency vs.
Output Current (Ext. BJT)
100
80
100
V
IN
V
IN
V
IN
V
IN
V
IN
= 2.5 V
= 2.0 V
= 1.5 V
= 1.2 V
= 0.9 V
V
V
V
= 4.0 V
= 3.0 V
= 2.5 V
= 2.0 V
= 0.9 V
V
= 4.5 V
IN
IN
IN
IN
80
60
40
20
0
V
IN
V
IN
60
40
20
0
V
IN
V
IN
= 1.5 V
= 1.2 V
NCP1450ASN30T1
L = 10 ꢀ H
NCP1450ASN50T1
L = 10 ꢀ H
Q = MMJT9410
Q = MMJT9410
R = 560 ꢃ
R = 560 ꢃ
b
b
C = 0.003 ꢀ F
C = 0.003 ꢀ F
b
b
OUT
C
= 220 ꢀ F
C
= 220 ꢀ F
OUT
T = 25°C
T = 25°C
A
A
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 67. NCP1450ASN30T1 Efficiency vs.
Output Current (Ext. BJT)
Figure 68. NCP1450ASN50T1 Efficiency vs.
Output Current (Ext. BJT)
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NCP1450A
10
1
100
A. V
B. V
C. V
D. V
E. V
F. V
= 1.9 V, R = 1 kꢃ
b
OUT
OUT
OUT
OUT
OUT
NCP1450ASNXXT1
L = 10 ꢀ H
Q = NTGS3446T1
F
= 3.0 V, R = 1 kꢃ
b
= 5.0 V, R = 1 kꢃ
b
C
E
= 1.9 V, R = 560 ꢃ
b
10
= 3.0 V, R = 560 ꢃ
C
= 220 ꢀ F
b
OUT
= 5.0 V, R = 560 ꢃ
OUT
b
T = 25°C
A
B
D
NCP1450ASNXXT1
L = 10 ꢀH
Q = MMJT9410
1
0.1
V
3
= 5.0 V
OUT
C
T
= 220 ꢀF
= 25°C
OUT
0.1
0.01
A
A
V
= 3.0 V
4
OUT
V
OUT
= 1.9 V
2
0.01
1
5
0
1
2
3
4
5
V
IN
, INPUT VOLTAGE (V)
V , INPUT VOLTAGE (V)
IN
Figure 69. NCP1450ASNXXT1 No Load Input
Current vs. Input Voltage (Using MOSFET)
Figure 70. NCP1450ASNXXT1 No Load Input
Current vs. Input Voltage (Using BJT)
Components Supplier
Parts
Supplier
Part Number
CD54−100MC
MBRM110L
Description
Phone
Inductor: L1, L2
Schottky Diode: D1, D2
MOSFET: Q1
Sumida Electric Co. Ltd.
ON Semiconductor
ON Semiconductor
ON Semiconductor
KEMET Electronics Corp.
Inductor 10 ꢀ H/1.44 A
(852) 2880−6688
(852) 2689−0088
(852) 2689−0088
(852) 2689−0088
(852) 2305−1168
Schottky Power Rectifier
Power MOSFET N−Channel
Bipolar Power Transistor
NTGS3446T1
MMJT9410
BJT: Q2
Output Capacitor: C1, C3
T494D227K006AS
Low ESR Tantalum Capacitor
220 ꢀ F/6.0 V
Input Capacitor: C2, C4
KEMET Electronics Corp.
T491C106K016AS
Low Profile Tantalum Capacitor
(852) 2305−1168
10 ꢀ F/16 V
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16
NCP1450A
DETAILED OPERATING DESCRIPTION
Soft Start
Operation
The NCP1450A series are monolithic power switching
controllers optimized for battery powered portable products
where large output current is required.
There is a soft start circuit in NCP1450A. When power is
applied to the device, the soft start circuit first pumps up the
output voltage to approximately 1.5 V at a fixed duty cycle.
This is the voltage level at which the controller can operate
normally. In addition to that, the startup capability with
heavy loads is also improved.
The NCP1450A series are low noise fixed frequency
voltage−mode PWM DC−DC controllers, and consist of
startup circuit, feedback resistor divider, reference voltage,
oscillator, loop compensation network, PWM control
circuit, and low ON resistance driver. Due to the on−chip
feedback resistor and loop compensation network, the
system designer can get the regulated output voltage from
1.8 V to 5.0 V with 0.1 V stepwise with a small number of
external components. The quiescent current is typically
Oscillator
The oscillator frequency is internally set to 180 kHz at an
accuracy of "20% and with low temperature coefficient of
0.11%/°C.
Regulated Converter Voltage (VOUT
)
93 ꢀ A (V
= 2.7 V, f
= 180 kHz), and can be further
OUT
OSC
The V
is set by an integrated feedback resistor
OUT
reduced to about 1.5 ꢀ A when the chip is disabled (V
t
CE
network. This is trimmed to a selected voltage from 1.8 V to
5.0 V range in 100 mV steps with an accuracy of "2.5%.
0.3 V).
The NCP1450A operation can be best understood by
referring to the block diagram in Figure 2. The error
amplifier monitors the output voltage via the feedback
resistor divider by comparing the feedback voltage with the
reference voltage. When the feedback voltage is lower than
the reference voltage, the error amplifier output will
decrease. The error amplifier output is then compared with
the oscillator ramp voltage at the PWM controller. When the
ramp voltage is higher than the error amplifier output, the
high−side driver is turned on and the low−side driver is
turned off which will then switch on the external transistor;
and vice versa. As the error amplifier output decreases, the
high−side driver turn−on time increases and duty cycle
increases. When the feedback voltage is higher than the
reference voltage, the error amplifier output increases and
the duty cycle decreases. When the external power switch is
on, the current ramps up in the inductor, storing energy in the
magnetic field. When the external power switch is off, the
energy stored in the magnetic field is transferred to the
output filter capacitor and the load. The output filter
capacitor stores the charge while the inductor current is
higher than the output current, then sustains the output
voltage until the next switching cycle.
Compensation
The device is designed to operate in continuous
conduction mode. An internal compensation circuit was
designed to guarantee stability over the full input/output
voltage and full output load range.
Enable/Disable Operation
The NCP1450A series offer IC shutdown mode by chip
enable pin (CE pin) to reduce current consumption. When
voltage at pin CE is equal or greater than 0.9 V, the chip will
be enabled, which means the controller is in normal
operation. When voltage at pin CE is less than 0.3 V, the chip
is disabled, which means IC is shutdown.
Important: DO NOT apply a voltage between 0.3 V to 0.9 V
to pin CE as this is the CE pin’s hysteresis voltage range.
Clearly defined output states can only be obtained by
applying voltage out of this range.
As the load current is decreased, the switch transistor turns
on for a shorter duty cycle. Under the light load condition,
the controller will skip switching cycles to reduce power
consumption, so that high efficiency is maintained at light
loads.
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17
NCP1450A
APPLICATION CIRCUIT INFORMATION
Step−up Converter Design Equations
Calculate the maximum inductance value which can
generate the desired current output and the preferred delta
inductor current to average inductor current ratio:
The NCP1450A PWM step−up DC−DC controller is
designed to operate in continuous conduction mode and can
be defined by the following equations. External components
values can be calculated from these equations, however, the
optimized value should obtained through experimental
results.
2
(3.3V ) 0.3V * 2.4V)(1 * 0.364)
180000Hz 1A 0.2
L v
+ 13.5ꢀ H
Determine the average inductor current and peak inductor
current:
Calculation
Equation
) V * V
IN
1
I
+
+ 1.57A
L
1 * 0.364
D
V
V
OUT
D
v
) V * V
OUT
D
S
0.2
I
+ 1.57A (1 )
) + 1.73A
PK
2
I
L
I
O
Therefore, a 12 ꢀ H inductor with saturation current larger
than 1.73 A can be selected as the initial trial.
Calculate the delta charge stored in the output capacitor
during the charging up period in each switching cycle:
(1 * D)
L
2
(V
) V * V )(1 * D)
IN
OUT
D
f I DIR
O
I
DIR
2
PK
I (1 )
)
L
(1.57A * 1A)(1 * 0.364)
ꢂ
Q
+
+ 2.01ꢀ C
18000Hz
ꢂ
Q
( I * I )(1 * D)
L
O
f
Determine the output capacitance value for the desired
output ripple voltage:
V
PP
ꢂ
Q
[
) ( I * I ) ESR
L O
C
OUT
Assume the ESR of the output capacitor is 0.15 ꢃ,
NOTES:
2.01ꢀ C
D
− On−time duty cycle
− Average inductor current
− Peak inductor current
C
u
+ 138.6ꢀ F
OUT
I
L
100mV * (1.57A * 1A) 0.15ꢃ
I
PK
Therefore, a Tantalum capacitor with value of 150 ꢀ F to
220 ꢀ F and ESR of 0.15 ꢃ can be used as the output
capacitor. However, according to experimental result,
220ꢄ ꢀ F output capacitor gives better overall operational
stability and smaller ripple voltage.
DIR − Delta inductor current to average inductor current ratio
I
O
− Desired dc output current
− Nominal operating dc input voltage
− Desired dc output voltage
− Diode forward voltage
− Saturation voltage of the external transistor switch
V
V
V
V
IN
OUT
D
S
− Charge stores in the C
− Equivalent series resistance of the output capacitor
during charging up
ꢂ
Q
OUT
External Component Selection
ESR
Inductor Selection
Design Example
The NCP1450A is designed to work well with a 6.8 to
12 ꢀ H inductors in most applications 10 ꢀ H is a sufficiently
low value to allow the use of a small surface mount coil, but
large enough to maintain low ripple. Lower inductance
values supply higher output current, but also increase the
ripple and reduce efficiency.
Higher inductor values reduce ripple and improve
efficiency, but also limit output current.
The inductor should have small DCR, usually less than
It is supposed that a step−up DC−DC controller with 3.3 V
output delivering a maximum 1000 mA output current with
100 mV output ripple voltage powering from a 2.4 V input
is to be designed.
Design parameters:
V
= 2.4 V
= 3.3 V
= 1.0 A
= 100 mV
IN
V
OUT
I
V
O
pp
1ꢄ ꢃ, to minimize loss. It is necessary to choose an inductor
with a saturation current greater than the peak current which
the inductor will encounter in the application.
f = 180 kHZ
DIR = 0.2 (typical for small output ripple voltage)
Assume the diode forward voltage and the transistor
saturation voltage are both 0.3 V. Determine the maximum
steady state duty cycle at V = 2.4 V:
IN
3.3V ) 0.3V * 2.4V
D +
+ 0.364
3.3V ) 0.3V * 0.3V
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18
NCP1450A
Diode
more efficient switch than a BJT transistor. However, the
The diode is the largest source of loss in DC−DC
converters. The most importance parameters which affect
MOSFET requires a higher voltage to turn on as compared
with BJT transistors. An enhancement N−channel MOSFET
can be selected by the following guidelines:
their efficiency are the forward voltage drop, V , and the
D
reverse recovery time, trr. The forward voltage drop creates
a loss just by having a voltage across the device while a
current flowing through it. The reverse recovery time
generates a loss when the diode is reverse biased, and the
current appears to actually flow backwards through the
diode due to the minority carriers being swept from the P−N
1. Low ON−resistance, R
2. Low gate threshold voltage, V
, typically < 0.1 ꢃ.
DS(on)
, must be <
GS(th)
V , typically < 1.5 V, it is especially important
OUT
for the low V
device, like V
= 1.9 V.
OUT
OUT
3. Rated continuous drain current, I , should be
D
larger than the peak inductor current, i.e. I > I
.
D
PK
junction.
A
Schottky diode with the following
4. Gate capacitance should be 1200 pF or less.
characteristics is recommended:
For bipolar NPN transistor, medium power transistor with
Small forward voltage, V t 0.3 V
continuous collector current typically 1 A to 5 A and V
F
CE(sat)
< 0.2 V should be employed. The driving capability is
Small reverse leakage current
determined by the DC current gain, H , of the transistor and
FE
Fast reverse recovery time/switching speed
the base resistor, Rb; and the controller’s EXT pin must be
able to supply the necessary driving current.
Rated current larger than peak inductor current,
I
u I
PK
rated
Reverse voltage larger than output voltage,
u V
Rb can be calculated by the following equation:
V
reverse
OUT
V
0.7
0.4
OUT *
Rb +
*
|
|
Ib
I
Input Capacitor
EXTH
The input capacitor can stabilize the input voltage and
minimize peak current ripple from the source. The value of
the capacitor depends on the impedance of the input source
used. Small Equivalent Series Resistance (ESR) Tantalum
or ceramic capacitor with a value of 10 ꢀ F should be
suitable.
I
H
PK
FE
Ib +
Since the pulse current flows through the transistor, the
exact Rb value should be finely tuned by the experiment.
Generally, a small Rb value can increase the output current
capability, but the efficiency will decrease due to more
energy is used to drive the transistor.
Moreover, a speed−up capacitor, Cb, should be connected
in parallel with Rb to reduce switching loss and improve
efficiency. Cb can be calculated by the equation below:
Output Capacitor
The output capacitor is used for sustaining the output
voltage when the external MOSFET or bipolar transistor is
switched on and smoothing the ripple voltage. Low ESR
capacitor should be used to reduce output ripple voltage. In
general, a 100 ꢀ F to 220 ꢀ F low ESR (0.10 ꢃ to 0.30 ꢃ)
Tantalum capacitor should be appropriate.
1
Cb v
2ꢅ Rb f
OSC
0.7
It is due to the variation in the characteristics of the
transistor used. The calculated value should be used as the
initial test value and the optimized value should be obtained
by the experiment.
External Switch Transistor
An enhancement N−channel MOSFET or a bipolar NPN
transistor can be used as the external switch transistor.
For enhancement N−channel MOSFET, since
enhancement MOSFET is a voltage driven device, it is a
External Component Reference Data
Inductor
Inductor
Value
External
Transistor
Output
Capacitor
Model
CD54
CD54
CD54
CD54
CD54
CD54
Device
V
Diode
OUT
NCP1450ASN19T1
NCP1450ASN30T1
NCP1450ASN50T1
NCP1450ASN19T1
NCP1450ASN30T1
NCP1450ASN50T1
1.9 V
3.0 V
5.0 V
1.9 V
3.0 V
5.0 V
12 ꢀ H
10 ꢀ H
10 ꢀ H
12 ꢀ H
10 ꢀ H
10 ꢀ H
NTGS3446T1
NTGS3446T1
NTGS3446T1
MMJT9410
MBRM110L
MBRM110L
MBRM110L
MBRM110L
MBRM110L
MBRM110L
220 ꢀ F
220 ꢀ F
220 ꢀ F
220 ꢀ F
220 ꢀ F
220 ꢀ F
MMJT9410
MMJT9410
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19
NCP1450A
An evaluation board of NCP1450A has been made in the
ON Semiconductor representative for availability. The
evaluation board schematic diagrams are shown in
Figures 73 and 74.
small size of 89 mm x 51 mm. The artwork and the silk
screen of the surface−mount evaluation board PCB are
shown in Figures 71 and 72. Please contact your
51 mm
89 mm
Figure 71. NCP1450A PWM Step−up DC−DC Controller Evaluation Board Silkscreen
51 mm
89 mm
Figure 72. NCP1450A PWM Step−up DC−DC Controller Evaluation Board Artwork (Component Side)
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20
NCP1450A
L1
10 ꢀ H
D1
MBRM110L
JP1
TP1
TP3
V
IN
V
OUT
NTGS3446T1
CE
1
EXT
5
ON
CE
OFF
Q1
C2
10 ꢀ F
C1
220 ꢀ F
OUT
2
IC1
C3
0.1 ꢀ F
NC
GND
4
TP2
GND
TP4
GND
3
Figure 73. NCP1450A Evaluation Board Schematic Diagram 1 (Step−up
DC−DC Converter Using External MOSFET Switch)
L2
10 ꢀ H
D2
MBRM110L
JP2
TP5
TP7
V
IN
V
OUT
Rb
560
CE
1
EXT
5
ON
CE
OFF
Q2
MMJT9410
C5
10 ꢀ F
C4
220 ꢀ F
OUT
2
IC2
Cb
3000 pF
C6
0.1 ꢀ F
NC
3
GND
4
TP6
TP8
GND
GND
Figure 74. NCP1450A Evaluation Board Schematic Diagram 2 (Step−up
DC−DC Converter Using External Bipolar Transistor Switch)
PCB Layout Hints
Grounding
Output Capacitor
One point grounding should be used for the output power
return ground, the input power return ground, and the device
switch ground to reduce noise. In Figure 73, e.g.: C2 GND,
C1 GND, and IC1 GND are connected at one point in the
evaluation board. The input ground and output ground traces
must be thick enough for current to flow through and for
reducing ground bounce.
The output capacitor should be placed close to the output
terminals to obtain better smoothing effect on the output
ripple.
Switching Noise Decoupling Capacitor
A 0.1 ꢀ F ceramic capacitor should be placed close to the
OUT pin and GND pin of the NCP1450A to filter the
switching spikes in the output voltage monitored by the
OUT pin.
Power Signal Traces
Low resistance conducting paths should be used for the
power carrying traces to reduce power loss so as to improve
efficiency (short and thick traces for connecting the inductor
L can also reduce stray inductance), e.g.: short and thick
traces listed below are used in the evaluation board:
1. Trace from TP1 to L1
2. Trace from L1 to anode pin of D1
3. Trace from cathode pin of D1 to TP3
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21
NCP1450A
PACKAGE DIMENSIONS
TSOP−5
SN SUFFIX
CASE 483−02
ISSUE E
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
D
2. CONTROLLING DIMENSION: MILLIMETER.
3. MAXIMUM LEAD THICKNESS INCLUDES
LEAD FINISH THICKNESS. MINIMUM LEAD
THICKNESS IS THE MINIMUM THICKNESS
OF BASE MATERIAL.
4. A AND B DIMENSIONS DO NOT INCLUDE
MOLD FLASH, PROTRUSIONS, OR GATE
BURRS.
5
4
3
B
C
S
1
2
L
MILLIMETERS
INCHES
MIN MAX
0.1142 0.1220
G
DIM
A
B
C
D
G
H
J
K
L
MIN
2.90
1.30
0.90
0.25
0.85
0.013
0.10
0.20
1.25
0
MAX
3.10
A
1.70 0.0512 0.0669
1.10 0.0354 0.0433
0.50 0.0098 0.0197
1.05 0.0335 0.0413
0.100 0.0005 0.0040
0.26 0.0040 0.0102
0.60 0.0079 0.0236
1.55 0.0493 0.0610
J
0.05 (0.002)
H
M
K
M
S
10
0
10
_
_
_
_
2.50
3.00 0.0985 0.1181
SOLDERING FOOTPRINT*
1.9
0.074
0.95
0.037
2.4
0.094
1.0
0.039
0.7
0.028
mm
inches
ǒ
Ǔ
SCALE 10:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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NCP1450A/D
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