T494D686K010AS [ONSEMI]
200 mA, PFM Step-Up Micropower Switching Regulator; 200毫安， PFM升压型微功率开关稳压器
| 型号： | T494D686K010AS |
| 厂家： | 
ONSEMI |
| 描述： | 200 mA, PFM Step-Up Micropower Switching Regulator |
| 文件： | 总18页 (文件大小：161K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NCP1402
200 mA, PFM Step−Up
Micropower Switching
Regulator
The NCP1402 series are monolithic micropower step−up DC to DC
converter that are specially designed for powering portable equipment
from one or two cell battery packs.These devices are designed to
start−up with a cell voltage of 0.8 V and operate down to less than
0.3 V. With only three external components, this series allow a simple
means to implement highly efficient converters that are capable of up
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5
to 200 mA of output current at V = 2.0 V, V
= 3.0 V.
in
OUT
1
Each device consists of an on−chip PFM (Pulse Frequency
Modulation) oscillator, PFM controller, PFM comparator, soft−start,
voltage reference, feedback resistors, driver, and power MOSFET
switch with current limit protection. Additionally, a chip enable
feature is provided to power down the converter for extended battery
life.
SOT23−5
(TSOP−5, SC59−5)
SN SUFFIX
CASE 483
The NCP1402 device series are available in the Thin SOT−23−5
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.
PIN CONNECTIONS AND
MARKING DIAGRAM
1
2
3
5
CE
OUT
NC
LX
Features
• Extremely Low Start−Up Voltage of 0.8 V
• Operation Down to Less than 0.3 V
GND
4
• High Efficiency 85% (V = 2.0 V, V
= 3.0 V, 70 mA)
in
OUT
xxx = Marking
• Low Operating Current of 30 m A (V
= 1.9 V)
OUT
Y
= Year
• Output Voltage Accuracy ± 2.5%
W
= Work Week
• Low Converter Ripple with Typical 30 mV
(Top View)
• Only Three External Components Are Required
• Chip Enable Power Down Capability for Extended Battery Life
• Micro Miniature Thin SOT−23−5 Packages
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 3 of this data sheet.
Typical Applications
• Cellular Telephones
• Pagers
• Personal Digital Assistants (PDA)
• Electronic Games
• Portable Audio (MP3)
• Camcorders
• Digital Cameras
• Handheld Instruments
Semiconductor Components Industries, LLC, 2003
1
Publication Order Number:
November, 2003 − Rev. 5
NCP1402/D
NCP1402
V
in
V
OUT
CE
1
LX
5
NCP1402
OUT
2
NC
3
GND
4
Figure 1. Typical Step−Up Converter Application
LX
5
OUT
2
V
LX
LIMITER
DRIVER
PFM
COMPARATOR
POWER
SWITCH
−
+
NC
3
PFM
CONTROLLER
VOLTAGE
REFERENCE
SOFT−START
PFM
OSCILLATOR
GND
4
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin #
Symbol
Pin Description
1
CE
Chip Enable pin
(1) The chip is enabled if a voltage which is equal to or greater than 0.9 V is applied
(2) The chip is disabled if a voltage which is less than 0.3 V is applied
(3) The chip will be enabled if it is left floating
2
3
4
5
OUT
NC
Output voltage monitor pin, also the power supply pin of the device
No internal connection to this pin
GND
LX
Ground pin
External inductor connection pin to power switch drain
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2
NCP1402
ORDERING INFORMATION
Device
NCP1402SN19T1
NCP1402SN27T1
NCP1402SN30T1
NCP1402SN33T1
NCP1402SN40T1
NCP1402SN50T1
Output Voltage
1.9 V
Device Marking
DAU
Package
Shipping
2.7 V
DAE
3.0 V
DAF
SOT23−5
3000 Units Per Reel
3.3 V
DAG
4.0 V
DCR
5.0 V
DAH
NOTE: The ordering information lists five standard output voltage device options. Additional device 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.
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage (Pin 2)
V
OUT
6.0
V
Input/Output Pins
LX (Pin 5)
LX Peak Sink Current
V
I
−0.3 to 6.0
400
V
mA
LX
LX
CE (Pin 1)
Input Voltage Range
Input Current Range
V
I
−0.3 to 6.0
−150 to 150
V
mA
CE
CE
Thermal Resistance Junction to Air
Operating Ambient Temperature Range (Note 2)
Operating Junction Temperature Range
Storage Temperature Range
R
250
°C/W
°C
θ
JA
T
−40 to +85
−40 to +125
−55 to +150
A
T
°C
J
T
°C
stg
NOTES:
1. 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.
2. The maximum package power dissipation limit must not be exceeded.
T
* T
J(max)
A
P
D
+
R
q
J
A
3. Latch−up 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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NCP1402
ELECTRICAL CHARACTERISTICS (For all values T = 25°C, unless otherwise noted.)
A
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Switch On Time (current limit not asserted)
Switch Minimum Off Time
t
t
3.6
1.0
70
−
5.5
1.45
78
7.6
1.9
85
0.95
−
m s
m s
on
off
Maximum Duty Cycle
D
%
MAX
Minimum Start−up Voltage (I = 0 mA)
V
start
0.8
−1.6
−
V
O
Minimum Start−up Voltage Temperature Coefficient (T = −40°C to 85°C)
D
V
−
mV/°C
V
A
start
hold
Minimum Operation Hold Voltage (I = 0 mA)
V
0.3
0.3
−
O
Soft−Start Time (V
u 0.8 V)
t
SS
2.0
−
ms
OUT
LX (PIN 5)
Internal Switching N−Channel FET Drain Voltage
V
LX
−
−
6.0
V
LX Pin On−State Sink Current (V = 0.4 V)
I
LX
mA
LX
Device Suffix:
19T1
27T1
30T1
33T1
110
130
130
130
130
130
145
180
190
200
210
215
−
−
−
−
−
−
40T1
50T1
Voltage Limit
V
0.45
−
0.65
0.5
0.9
1.0
V
LXLIM
Off−State Leakage Current (V = 6.0 V, T = −40°C to 85°C)
I
LKG
µA
LX
A
CE (PIN 1)
CE Input Voltage (V
= V
x 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)
µA
High State, Device Enabled (V
Low State, Device Disabled (V
= V = 6.0 V)
I
I
−0.5
−0.5
0
0.15
0.5
0.5
OUT
OUT
CE
CE(high)
= 6.0 V, V = 0 V)
CE
CE(low)
TOTAL DEVICE
Output Voltage
Device Suffix:
19T1
V
OUT
V
1.853
2.632
2.925
3.218
3.900
4.875
1.9
2.7
3.0
3.3
4.0
5.0
1.948
2.768
3.075
3.383
4.100
5.125
27T1
30T1
33T1
40T1
50T1
Output Voltage Temperature Coefficient (T = −40°C to +85°C)
D
V
ppm/°C
A
OUT
Device Suffix:
19T1
27T1
30T1
33T1
−
−
−
−
−
−
150
150
150
150
150
150
−
−
−
−
−
−
40T1
50T1
Operating Current 2 (V
= V = V
+0.5 V, Note 5)
I
I
I
−
−
13
15
µA
µA
µA
OUT
CE
SET
DD2
Off−State Current (V
= 5.0 V, V = 0 V, T = −40°C to +85°C, Note 6)
0.6
1.0
OUT
CE
A
OFF
DD1
Operating Current 1 (V
= V = V x 0.96)
SET
OUT
CE
Device Suffix:
19T1
27T1
30T1
33T1
−
−
−
−
−
−
30
39
42
45
55
70
50
60
60
60
100
100
40T1
50T1
5. V
means setting of output voltage.
SET
6. CE pin is integrated with an internal 10 MΩ pull−up resistor.
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NCP1402
2.1
2.0
1.9
1.8
1.7
1.6
4.0
3.5
3.0
2.5
2.0
1.5
NCP1402SN19T1
L = 47 µH
T = 25°C
A
NCP1402SN30T1
L = 47 µH
T = 25°C
A
V
= 2.5 V
in
V
= 2.0 V
in
V
in
= 0.9 V
V = 1.5 V
in
V
= 1.5 V
in
V
= 0.9 V
in
V
in
= 1.2 V
V
= 1.2 V
in
0
0
0
20
40 60
80 100 120 140 160 180 200
0
0
0
20
40 60
80 100 120 140 160 180 200
I , OUTPUT CURRENT (mA)
I , OUTPUT CURRENT (mA)
O
O
Figure 3. NCP1402SN19T1 Output Voltage vs.
Output Current
Figure 4. NCP1402SN30T1 Output Voltage vs.
Output Current
6.0
5.0
4.0
3.0
2.0
1.0
100
80
60
40
20
0
V
in
= 4.0 V
V
in
= 1.5 V
V
in
= 1.5 V
V
V
= 2.0 V
= 3.0 V
in
V
in
= 1.2 V
V
in
= 0.9 V
V = 1.2 V
in
in
V
= 0.9 V
in
NCP1402SN50T1
L = 47 µH
T = 25°C
NCP1402SN19T1
L = 47 µH
T = 25°C
A
A
20
40 60
80 100 120 140 160 180 200
20
40 60
80 100 120 140 160 180 200
I , OUTPUT CURRENT (mA)
I , OUTPUT CURRENT (mA)
O
O
Figure 5. NCP1402SN50T1 Output Voltage vs.
Output Current
Figure 6. NCP1402SN19T1 Efficiency vs.
Output Current
100
80
60
40
20
0
100
80
V
V
= 4.0 V
= 3.0 V
in
V
in
V
in
= 2.5 V
= 2.0 V
in
V
in
= 1.2 V
V
in
= 1.5 V
V
= 2.0 V
in
60
V
in
= 0.9 V
V
in
= 1.2 V
V = 1.5 V
in
V
in
= 0.9 V
40
NCP1402SN30T1
L = 47 µH
T = 25°C
NCP1402SN50T1
L = 47 µH
T = 25°C
A
20
0
A
20
40 60
80 100 120 140 160 180 200
20
40 60
80 100 120 140 160 180 200
I , OUTPUT CURRENT (mA)
O
I , OUTPUT CURRENT (mA)
O
Figure 7. NCP1402SN30T1 Efficiency vs.
Output Current
Figure 8. NCP1402SN50T1 Efficiency vs.
Output Current
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NCP1402
3.2
3.1
3.0
2.9
2.8
2.7
2.1
2.0
1.9
1.8
1.7
1.6
NCP1402SN19T1
= 1.9 V x 0.96
Open−Loop Test
NCP1402SN30T1
V = 3.0 V x 0.96
OUT
Open−Loop Test
V
OUT
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 9. NCP1402SN19T1 Output Voltage vs.
Temperature
Figure 10. NCP1402SN30T1 Output Voltage vs.
Temperature
5.2
5.1
5.0
4.9
4.8
4.7
100
80
60
40
20
0
NCP1402SN50T1
NCP1402SN19T1
V
OUT
= 5.0 V x 0.96
V
OUT
= 1.9 V x 0.96
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 11. NCP1402SN50T1 Output Voltage vs.
Temperature
Figure 12. NCP1402SN19T1 Operating
Current 1 vs. Temperature
100
80
60
40
20
0
100
80
60
40
20
0
NCP1402SN30T1
NCP1402SN50T1
V
OUT
= 3.0 V x 0.96
V
OUT
= 5.0 V x 0.96
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 13. NCP1402SN30T1 Operating
Current 1 vs. Temperature
Figure 14. NCP1402SN50T1 Operating
Current 1 vs. Temperature
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NCP1402
7.5
7.0
6.5
6.0
5.5
5.0
7.5
7.0
6.5
6.0
5.5
5.0
NCP1402SN19T1
= 1.9 V x 0.96
Open−Loop Test
NCP1402SN30T1
V = 3.0 V x 0.96
OUT
Open−Loop Test
V
OUT
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
100
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 15. NCP1402SN19T1 Switch On Time
vs. Temperature
Figure 16. NCP1402SN30T1 Switch On Time
vs. Temperature
7.0
6.5
6.0
5.5
5.0
4.5
1.9
1.8
1.7
1.6
NCP1402SN50T1
NCP1402SN19T1
1.5
1.4
V
OUT
= 5.0 V x 0.96
V
OUT
= 1.9 V x 0.96
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 17. NCP1402SN50T1 Switch On Time
vs. Temperature
Figure 18. NCP1402SN19T1 Minimum Switch
Off Time vs. Temperature
1.8
1.7
1.6
1.5
1.4
1.3
1.8
1.7
1.6
1.5
1.4
1.3
NCP1402SN30T1
NCP1402SN50T1
V
OUT
= 3.0 V x 0.96
V
OUT
= 5.0 V x 0.96
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 19. NCP1402SN30T1 Minimum Switch
Off Time vs. Temperature
Figure 20. NCP1402SN50T1 Minimum Switch
Off Time vs. Temperature
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NCP1402
100
90
80
70
60
50
40
100
90
80
70
60
NCP1402SN19T1
= 1.9 V x 0.96
Open−Loop Test
NCP1402SN30T1
V = 3.0 V x 0.96
OUT
Open−Loop Test
50
40
V
OUT
−50
−25
0
25
50
75
100
100
100
−50
−25
0
25
50
75
100
100
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 21. NCP1402SN19T1 Maximum Duty
Cycle vs. Temperature
Figure 22. NCP1402SN30T1 Maximum Duty
Cycle vs. Temperature
100
90
80
70
60
200
180
160
140
120
100
NCP1402SN19T1
V
V
= 1.9 V x 0.96
= 0.4 V
OUT
NCP1402SN50T1
50
40
LX
V
OUT
= 5.0 V x 0.96
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 23. NCP1402SN50T1 Maximum Duty
Cycle vs. Temperature
Figure 24. NCP1402SN19T1 LX Pin On−State
Current vs. Temperature
250
230
210
190
170
150
300
275
250
225
200
175
NCP1402SN30T1
NCP1402SN50T1
V
V
= 3.0 V x 0.96
= 0.4 V
V = 5.0 V x 0.96
OUT
OUT
V = 0.4 V
LX
LX
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
−50
−25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 25. NCP1402SN30T1 LX Pin On−State
Current vs. Temperature
Figure 26. NCP1402SN50T1 LX Pin On−State
Current vs. Temperature
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NCP1402
1.0
0.8
0.6
0.4
0.2
0.0
1.0
0.8
0.6
0.4
0.2
0.0
NCP1402SN19T1
Open−Loop Test
NCP1402SN30T1
Open−Loop Test
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 27. NCP1402SN19T1 VLX Voltage Limit
vs. Temperature
Figure 28. NCP1402SN30T1 VLX Voltage Limit
vs. Temperature
1.0
0.8
0.6
0.4
0.2
0.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
NCP1402SN19T1
V
V
= 1.9 V x 0.96
= 0.4 V
OUT
NCP1402SN50T1
Open−Loop Test
LX
Open−Loop Test
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 29. NCP1402SN50T1 VLX Voltage Limit
vs. Temperature
Figure 30. NCP1402SN19T1 Switch−on
Resistance vs. Temperature
3.0
2.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
NCP1402SN30T1
NCP1402SN50T1
V
V
= 3.0 V x 0.96
= 0.4 V
V = 5.0 V x 0.96
OUT
OUT
V = 0.4 V
LX
LX
Open−Loop Test
Open−Loop Test
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 31. NCP1402SN30T1 Switch−on
Resistance vs. Temperature
Figure 32. NCP1402SN50T1 Switch−on
Resistance vs. Temperature
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NCP1402
1.0
0.8
1.0
0.8
V
start
V
start
NCP1402SN19T1
L = 22 µH
NCP1402SN30T1
L = 22 µH
0.6
0.4
0.2
0.0
0.6
0.4
0.2
0.0
C
I
= 10 µF
= 0 mA
C
I
= 10 µF
= 0 mA
OUT
OUT
O
O
V
hold
V
hold
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 33. NCP1402SN19T1 Startup/Hold
Voltage vs. Temperature
Figure 34. NCP1402SN30T1 Startup/Hold
Voltage vs. Temperature
1.0
0.8
2.0
1.5
1.0
V
start
V
start
NCP1402SN50T1
L = 22 µH
0.6
0.4
0.2
0.0
V
hold
C
= 10 µF
OUT
I
O
= 0 mA
NCP1402SN19T1
L = 47 µH
0.5
0.0
V
hold
C
= 68 µF
OUT
T = 25°C
A
0
10
20 30 40 50 60 70
I , OUTPUT CURRENT (mA)
80 90 100
−50
−25
0
25
50
75
100
TEMPERATURE (°C)
O
Figure 35. NCP1402SN50T1 Startup/Hold
Voltage vs. Temperature
Figure 36. NCP1402SN19T1 Startup/Hold
Voltage vs. Output Current
2.0
1.5
1.0
2.0
1.5
1.0
V
start
V
start
V
hold
NCP1402SN30T1
L = 47 µH
NCP1402SN50T1
L = 47 µH
0.5
0.0
0.5
0.0
V
hold
C
= 68 µF
C
= 68 µF
OUT
OUT
T = 25°C
A
T = 25°C
A
0
10
20 30 40 50 60 70
I , OUTPUT CURRENT (mA)
80 90 100
0
10
20 30 40 50 60 70
I , OUTPUT CURRENT (mA)
80 90 100
O
O
Figure 37. NCP1402SN30T1 Startup/Hold
Voltage vs. Output Current
Figure 38. NCP1402SN50T1 Startup/Hold
Voltage vs. Output Current
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NCP1402
5 m s/div
= 1.9 V, V = 1.2 V, I = 30 mA, L = 47 mH, C
5 m s/div
= 1.9 V, V = 1.2 V, I = 70 mA, L = 47 mH, C
V
OUT
= 68 mF
V
OUT
= 68 mF
OUT
in
O
OUT
in
O
1. V , 1.0 V/div
1. V , 1.0 V/div
LX
LX
2. V , 20 mV/div, AC coupled
OUT
2. V , 20 mV/div, AC coupled
OUT
3. I , 100 mA/div
3. I , 100 mA/div
L
L
Figure 39. NCP1402SN19T1 Operating
Waveforms (Medium Load)
Figure 40. NCP1402SN19T1 Operating
Waveforms (Heavy Load)
2 m s/div
2 m s/div
V
OUT
= 3.0 V, V = 1.2 V, I = 30 mA, L = 47 mH, C
= 68 mF
V
OUT
= 3.0 V, V = 1.2 V, I = 70 mA, L = 47 mH, C
= 68 mF
in
O
OUT
in
O
OUT
1. V , 2.0 V/div
1. V , 2.0 V/div
LX
LX
2. V , 20 mV/div, AC coupled
OUT
2. V , 20 mV/div, AC coupled
OUT
3. I , 100 mA/div
3. I , 100 mA/div
L
L
Figure 41. NCP1402SN30T1 Operating
Waveforms (Medium Load)
Figure 42. NCP1402SN30T1 Operating
Waveforms (Heavy Load)
2 m s/div
2 m s/div
V
OUT
= 5.0 V, V = 1.5 V, I = 30 mA, L = 47 mH, C
= 68 mF
V
OUT
= 5.0 V, V = 1.5 V, I = 60 mA, L = 47 mH, C
= 68 mF
in
O
OUT
in
O
OUT
1. V , 2.0 V/div
1. V , 2.0 V/div
LX
LX
2. V , 20 mV/div, AC coupled
OUT
2. V , 20 mV/div, AC coupled
OUT
3. I , 100 mA/div
3. I , 100 mA/div
L
L
Figure 43. NCP1402SN50T1 Operating
Waveforms (Medium Load)
Figure 44. NCP1402SN50T1 Operating
Waveforms (Heavy Load)
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NCP1402
V
in
= 1.2 V, L = 47 mH, C
= 68 mF
V
in
= 1.2 V, L = 47 mH, C
= 68 mF
OUT
OUT
1. V
= 1.9 V (AC coupled), 100 mV/div
1. V
= 1.9 V (AC coupled), 100 mV/div
OUT
OUT
2. I = 0.1 mA to 80 mA
2. I = 80 mA to 0.1 mA
O
O
Figure 45. NCP1402SN19T1 Load Transient
Response
Figure 46. NCP1402SN19T1 Load Transient
Response
V
in
= 1.5 V, L = 47 mH, C
= 68 mF
V
in
= 1.5 V, L = 47 mH, C
= 68 mF
OUT
OUT
1. V
= 3.0 V (AC coupled), 100 mV/div
1. V
= 3.0 V (AC coupled), 100 mV/div
OUT
OUT
2. I = 0.1 mA to 80 mA
2. I = 80 mA to 0.1 mA
O
O
Figure 47. NCP1402SN30T1 Load Transient
Response
Figure 48. NCP1402SN30T1 Load Transient
Response
V
in
= 2.4 V, L = 47 mH, C
= 68 mF
V
in
= 2.4 V, L = 47 mH, C
= 68 mF
OUT
OUT
1. V
= 5.0 V (AC coupled), 100 mV/div
1. V
= 5.0 V (AC coupled), 100 mV/div
OUT
OUT
2. I = 0.1 mA to 80 mA
2. I = 80 mA to 0.1 mA
O
O
Figure 49. NCP1402SN50T1 Load Transient
Response
Figure 50. NCP1402SN50T1 Load Transient
Response
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12
NCP1402
100
80
100
80
NCP1402SN19T1
L = 47 µH
NCP1402SN30T1
L = 47 µH
C
= 68 m F
C
= 68 m F
OUT
OUT
T = 25°C
A
T = 25°C
A
V
= 2.0 V
= 2.5 V
in
60
60
V
in
= 1.5 V
V
in
= 0.9 V
V
in
= 1.2 V
V
= 1.5 V
in
40
20
0
40
20
0
V
V
in
= 1.2 V
in
V
= 0.9 V
in
0
20
40 60
80 100 120 140 160 180 200
0
1
1
20
40 60
80 100 120 140 160 180 200
I , OUTPUT CURRENT (mA)
I , OUTPUT CURRENT (mA)
O
O
Figure 51. NCP1402SN19T1 Ripple Voltage vs.
Output Current
Figure 52. NCP1402SN30T1 Ripple Voltage vs.
Output Current
100
80
100
80
V
in
= 4.0 V
V
in
= 2.0 V
85°C
25°C
V
in
= 1.5 V
60
60
V
= 3.0 V
in
−40°C
V
= 1.2 V
in
40
20
0
40
20
0
NCP1402SN50T1
L = 47 µH
NCP1402SNXXT1
= V x 0.96
C
= 68 m F
V
OUT
OUT
SET
T = 25°C
A
Open−loop Test
V
= 0.9 V
in
0
20
40 60
80 100 120 140 160 180 200
2
3
4
5
6
I , OUTPUT CURRENT (mA)
O
V , OUTPUT VOLTAGE (V)
OUT
Figure 53. NCP1402SN50T1 Ripple Voltage vs.
Output Current
Figure 54. NCP1402SNXXT1 Operating
Current 1 vs. Output Voltage
300
260
220
3.5
3.0
2.5
NCP1402SNXXT1
−40°C
V
V
= V
= 0.4 V
x 0.96
OUT
SET
LX
Open−loop Test
25°C
85°C
85°C
25°C
180
140
100
2.0
1.5
1.0
NCP1402SNXXT1
V
V
= V
= 0.4 V
x 0.96
OUT
SET
−40°C
LX
Open−loop Test
1
2
3
4
5
6
2
3
4
5
6
V , OUTPUT VOLTAGE (V)
OUT
V , OUTPUT VOLTAGE (V)
OUT
Figure 55. NCP1402SNXXT1 Pin On−state
Current vs. Output Voltage
Figure 56. NCP1402SNXXT1 Switch−On
Resistance vs. Output Voltage
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13
NCP1402
150
125
100
75
400
NCP1402SNXXT1
L = 47 µH
= 0 mA
3.3 V
5.0 V
5.0 V
I
O
3.0 V
2.7 V
300
T = 25°C
A
3.3 V
3.0 V
200
100
0
1.9 V
50
25
2.7 V
NCP1402SNXXT1
L = 47 µH
T = 25°C
A
1.9 V
0
0
1
2
3
4
5
6
0
1
2
3
4
5
V , INPUT VOLTAGE (V)
in
V , INPUT VOLTAGE (V)
in
Figure 57. NCP1402SNXXT1 No Load Input
Current vs. Input Voltage
Figure 58. NCP1402SNXXT1 Maximum Output
Current vs. Input Voltage
DETAILED OPERATING DESCRIPTION
Operation
Soft Start
The NCP1402 series are monolithic power switching
regulators optimized for applications where power drain
must be minimized. These devices operate as variable
frequency, voltage mode boost regulators and designed to
operate in continuous conduction mode. Potential
applications include low powered consumer products and
battery powered portable products.
The NCP1402 series are low noise variable frequency
voltage−mode DC−DC converters, and consist of soft−start
circuit, feedback resistor, reference voltage, oscillator, PFM
comparator, PFM control circuit, current limit circuit and
power switch. Due to the on−chip feedback resistor network,
the system designer can get the regulated output voltage
from 1.8 V to 5 V with a small number of external
components. The operating current is typically 30 m A
There is a soft start circuit in NCP1402. When power is
applied to the device, the soft start circuit pumps up the output
voltage to approximately 1.5 V at a fixed duty cycle, the level
at which the converter can operate normally. What is more,
the start−up capability with heavy loads is also improved.
Regulated Converter Voltage (VOUT
)
The V
is set by an internal feedback resistor network.
OUT
This is trimmed to a selected voltage from 1.8 to 5.0 V range
in 100 mV steps with an accuracy of $2.5%.
Current Limit
The NCP1402 series utilizes cycle−by−cycle current
limiting as a means of protecting the output switch
MOSFET from overstress and preventing the small value
inductor from saturation. Current limiting is implemented
by monitoring the output MOSFET current build−up during
conduction, and upon sensing an overcurrent conduction
immediately turning off the switch for the duration of the
oscillator cycle.
The voltage across the output MOSFET is monitored and
compared against a reference by the VLX limiter. When the
threshold is reached, a signal is sent to the PFM controller
block to terminate the power switch conduction. The current
limit threshold is typically set at 350 mA.
(V
= 1.9 V), and can be further reduced to about 0.6 m A
OUT
when the chip is disabled (V < 0.3 V).
CE
The NCP1402 operation can be best understood by
examining the block diagram in Figure 2. PFM comparator
monitors the output voltage via the feedback resistor. When
the feedback voltage is higher than the reference voltage, the
power switch is turned off. As the feedback voltage is lower
than reference voltage and the power switch has been off for
at least a period of minimum off−time decided by PFM
oscillator, the power switch is then cycled on for a period of
on−time also decided by PFM oscillator, or until current
limit signal is asserted. When the power switch is on, current
ramps up in the inductor, storing energy in the magnetic
field. When the power switch is off, the energy in the
magnetic field is transferred to output filter capacitor and the
load. The output filter capacitor stores the charge while the
inductor current is high, then holds up the output voltage
until next switching cycle.
Enable / Disable Operation
The NCP1402 series offer IC shut−down mode by chip
enable pin (CE pin) to reduce current consumption. An
internal pull−up resistor tied the CE pin to OUT pin by
default i.e. user can float the pin CE for permanent “On”.
When voltage at pin CE is equal or greater than 0.9 V, the
chip will be enabled, which means the regulator 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 and 0.9 V to pin CE as this is the CE pin’s hyteresis voltage
range. Clearly defined output states can only be obtained by applying voltage out of this range.
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14
NCP1402
APPLICATIONS CIRCUIT INFORMATION
L1
D1
V
V
in
OUT
47 m H
C1
10 m F
C2
68 m F
CE
1
LX
5
NCP1402
OUT
2
NC
3
GND
4
Figure 59. Typical Application Circuit
Step−up Converter Design Equations
NCP1402 step−up DC−DC converter designed to operate
in continuous conduction mode can be defined by:
enough to maintain low ripple. Low inductance values
supply higher output current, but also increase the ripple and
reduce efficiency. Note that values below 27 m H is not
recommended due to NCP1402 switch limitations. Higher
inductor values reduce ripple and improve efficiency, but
also limit output current.
The inductor should have small DCR, usually less than 1
W to minimize loss. It is necessary to choose an inductor with
saturation current greater than the peak current which the
inductor will encounter in the application.
Calculation
Equation
2
V
in
I
L
v Mǒ
Ǔ
V
OUT Omax
(V * V
t
I
PK
in
s) on
) I
min
L
(t ) t )I
(V * V )t
in S on
on
off O
I
Diode
min
*
t
off
2L
The diode is the main source of loss in DC−DC converters.
The most importance parameters which affect their
(V * V
t
s) on
in
t
off
efficiency are the forward voltage drop, V , and the reverse
(V
) V * V )
F
OUT
F
in
recovery time, t . The forward voltage drop creates a loss
rr
D
Q
(I * I )t
L
O off
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 junction. A
Schottky diode with the following characteristics is
recommended:
D Q
C
V
[
) (I * I )ESR
ripple
L
O
OUT
*NOTES:
I
I
I
I
I
V
V
V
V
−
−
−
−
−
−
−
−
−
−
−
−
−
Peak inductor current
PK
min
O
Minimum inductor current
Desired dc output current
Desired maximum dc output current
Average inductor current
Nominal operating dc input voltage
Omax
L
Small forward voltage, V < 0.3 V
F
in
Small reverse leakage current
Fast reverse recovery time/ switching speed
Rated current larger than peak inductor current,
Desired dc output voltage
OUT
F
Diode forward voltage
Saturation voltage of the internal FET switch
S
D Q
V
Charge stores in the C
Output ripple voltage
during charging up
OUT
I
> I
rated
PK
ripple
Reverse voltage larger than output voltage,
> V
ESR
M
Equivalent series resistance of the output capacitor
An empirical factor, when V ≥ 3.0 V,
V
reverse
OUT
OUT
−6
−6
M = 8 x 10 , otherwise M = 5.3 x 10
.
Input Capacitor
EXTERNAL COMPONENT SELECTION
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 ESR (Equivalent Series Resistance) Tantalum or
ceramic capacitor with value of 10 mF should be suitable.
Inductor
The NCP1402 is designed to work well with a 47 m H
inductor in most applications. 47 m H is a sufficiently low
value to allow the use of a small surface mount coil, but large
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NCP1402
Output Capacitor
An evaluation board of NCP1402 has been made in the
size of 23 mm x 20 mm only, as shown in Figures 60 and 61.
Please contact your ON Semiconductor representative for
availability. The evaluation board schematic diagram, the
artwork and the silkscreen of the surface−mount PCB are
shown below:
The output capacitor is used for sustaining the output
voltage when the internal MOSFET is switched on and
smoothing the ripple voltage. Low ESR capacitor should be
used to reduce output ripple voltage. In general, a 47 uF to
68 uF low ESR (0.15 Wto 0.30 W) Tantalum capacitor
should be appropriate. For applications where space is a
critical factor, two parallel 22 uF low profile SMD ceramic
capacitors can be used.
20 mm
23 mm
Figure 60. NCP1402 PFM Step−Up DC−DC Converter Evaluation Board Silkscreen
20 mm
23 mm
Figure 61. NCP1402 PFM Step−Up DC−DC Converter Evaluation Board Artwork (Component Side)
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NCP1402
Components Supplier
Parts
Supplier
Part Number
Description
Inductor 47 m H / 0.72 A
Schottky Power Rectifier
Phone
Inductor, L1
Sumida Electric Co. Ltd.
ON Semiconductor Corp.
CD54−470L
(852)−2880−6688
(852)−2689−0088
Schottky Diode, D1
MBR0520LT1
Low ESR Tantalum Capacitor
68 m F / 10 V
Output Capacitor, C2
Input Capacitor, C1
KEMET Electronics Corp. T494D686K010AS
KEMET Electronics Corp. T491C106K016AS
(852)−2305−1168
(852)−2305−1168
Low Profile Tantalum Capacitor
10 m F / 16 V
PCB Layout Hints
Grounding
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
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 as shown in Figure 62, e.g. :
C2 GND, C1 GND, and U1 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.
2. Trace from L1 to Lx pin of U1
3. Trace from L1 to anode pin of D1
4. Trace from cathode pin of D1 to TP2
Output Capacitor
Power Signal Traces
Low resistance conducting paths should be used for the
power carrying traces to reduce power loss so as to improve
The output capacitor should be placed close to the output
terminals to obtain better smoothing effect on the output
ripple.
L1
TP1
TP2
V
in
V
out
D1
47 µH
MBR0520LT1
CE
1
LX
5
+
On
Off
+
JP1
Enable
C1
10 µF/16 V
C2
68 µF/10 V
NCP1402
OUT
2
NC
3
GND
6
TP4
TP3
GND
GND
Figure 62. NCP1402 Evaluation Board Schematic Diagram
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17
NCP1402
PACKAGE DIMENSIONS
SOT23−5
(TSOP−5, SC59−5)
SN SUFFIX
CASE 483−02
ISSUE C
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
G
MILLIMETERS
DIM MIN MAX
INCHES
MIN MAX
A
A
B
C
D
G
H
J
K
L
M
S
2.90
1.30
0.90
0.25
0.85
3.10 0.1142 0.1220
1.70 0.0512 0.0669
1.10 0.0354 0.0433
0.50 0.0098 0.0197
1.05 0.0335 0.0413
J
0.05 (0.002)
0.013 0.100 0.0005 0.0040
H
0.10
0.20
1.25
0
0.26 0.0040 0.0102
0.60 0.0079 0.0236
1.55 0.0493 0.0610
M
K
10
0
10
_
_
_
_
2.50
3.00 0.0985 0.1181
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.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
ON Semiconductor Website: http://onsemi.com
Order Literature: http://www.onsemi.com/litorder
Literature Distribution Center for ON Semiconductor
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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
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2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051
Phone: 81−3−5773−3850
For additional information, please contact your
local Sales Representative.
NCP1402/D
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