Datasheet NCP1402SN19T1, NCP1402SN27T1, NCP1402SN30T1, NCP1402SN33T1, NCP1402SN40T1 Datasheet (ON) [ru]
...Page 1
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
startup 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
to 200 mA of output current at V
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.
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.
Features
• Pb−Free Packages are Available
• Extremely Low Startup Voltage of 0.8 V
• Operation Down to Less than 0.3 V
• High Efficiency 85% (V
• Low Operating Current of 30 A (V
• Output Voltage Accuracy ± 2.5%
• Low Converter Ripple with Typical 30 mV
• Only Three External Components Are Required
• Chip Enable Power Down Capability for Extended Battery Life
• Micro Miniature Thin SOT−23−5 Packages
in
= 2.0 V, V
in
= 2.0 V, V
OUT
= 1.9 V)
OUT
= 3.0 V.
OUT
= 3.0 V, 70 mA)
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1
SOT23−5
(TSOP−5, SC59−5)
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
1
CE
2
OUT
3
NC
xxx = Marking
Y = Year
W = Work Week
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 3 of this data sheet.
xxxYW
5
LX
GND
4
T ypical Applications
• Cellular Telephones
• Pagers
• Personal Digital Assistants (PDA)
• Electronic Games
• Portable Audio (MP3)
• Camcorders
• Digital Cameras
• Handheld Instruments
Semiconductor Components Industries, LLC, 2004
October, 2004 − Rev. 6
1 Publication Order Number:
NCP1402/D
Page 2
NCP1402
1
CE
Chi Enable in
() g q g
OUT
NC
GND
V
in
CE
OUT
NC
1
NCP1402
2
3
LX
5
GND
4
V
OUT
Figure 1. T ypical Step−Up Converter Application
2
PFM
COMPARATOR
−
3
REFERENCE
4
+
VOLTAGE
SOFT−START
VLX LIMITER
DRIVER
POWER
SWITCH
PFM
CONTROLLER
PFM
OSCILLATOR
LX
5
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin # Symbol Pin Description
1 CE Chip Enable pin
2 OUT Output voltage monitor pin, also the power supply pin of the device
3 NC No internal connection to this pin
4 GND Ground pin
5 LX External inductor connection pin to power switch drain
(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
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NCP1402
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
ORDERING INFORMATION
Device Output Voltage Device Marking Package Shipping
NCP1402SN19T1 1.9 V DAU
NCP1402SN27T1 2.7 V DAE
NCP1402SN30T1 3.0 V DAF
SOT23−5
NCP1402SN33T1 3.3 V DAG
NCP1402SN33T1G 3.3 V DAG SOT23−5
(Pb−Free)
3000 Units Per Reel
NCP1402SN40T1 4.0 V DCR
NCP1402SN50T1 5.0 V DAH
NCP1402SN50T1G 5.0 V DAH
SOT23−5
SOT23−5
(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.
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)
Input/Output Pins
БББББББББББББББББББББ
LX (Pin 5)
LX Peak Sink Current
БББББББББББББББББББББ
CE (Pin 1)
Input Voltage Range
БББББББББББББББББББББ
Input Current Range
Thermal Resistance, Junction−to−Air
Operating Ambient Temperature Range (Note 2)
Operating Junction Temperature Range
Storage Temperature Range
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.
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
P
D
J(max)
R
JA
T
A
3. Latchup Current Maximum Rating: ±150 mA per JEDEC standard: JESD78.
4. Moisture Sensitivity Level: MSL 1 per IPC/JEDEC standard: J−STD−020A.
V
OUT
ÁÁ
V
LX
I
LX
ÁÁ
V
CE
ÁÁ
I
CE
R
JA
T
A
T
J
T
stg
6.0
ÁÁÁÁ
−0.3 to 6.0
400
ÁÁÁÁ
−0.3 to 6.0
ÁÁÁÁ
−150 to 150
250
−40 to +85
−40 to +125
−55 to +150
†
Á
mA
Á
Á
mA
°C/W
°C
°C
°C
V
V
V
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NCP1402
ELECTRICAL CHARACTERISTICS (For all values T
= 25°C, unless otherwise noted.)
A
Characteristic
OSCILLATOR
Switch On Time (current limit not asserted)
Switch Minimum Off Time t
Maximum Duty Cycle D
Minimum Startup Voltage (IO = 0 mA) V
Minimum Startup Voltage Temperature Coefficient (TA = −40°C to 85°C) V
Minimum Operation Hold Voltage (IO = 0 mA) V
Soft−Start Time (V
0.8 V) t
OUT
LX (PIN 5)
Internal Switching N−Channel FET Drain Voltage
LX Pin On−State Sink Current (VLX = 0.4 V)
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
Voltage Limit V
Off−State Leakage Current (VLX = 6.0 V, TA = −40°C to 85°C) I
CE (PIN 1)
CE Input Voltage (V
OUT
= V
SET
x 0.96)
High State, Device Enabled
Low State, Device Disabled
CE Input Current (Note 6)
High State, Device Enabled (V
Low State, Device Disabled (V
= VCE = 6.0 V)
OUT
= 6.0 V, VCE = 0 V)
OUT
TOTAL DEVICE
Output Voltage
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
Output Voltage Temperature Coefficient (TA = −40°C to +85°C)
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
Operating Current 2 (V
Off−State Current (V
Operating Current 1 (V
= VCE = V
OUT
= 5.0 V, VCE = 0 V, TA = −40°C to +85°C, Note 6) I
OUT
= VCE = V
OUT
+0.5 V, Note 5) I
SET
x 0.96)
SET
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
5. V
means setting of output voltage.
SET
6. CE pin is integrated with an internal 10 M pullup resistor.
Symbol Min Typ Max Unit
t
on
off
MAX
start
start
hold
SS
V
LX
I
LX
LXLIM
LKG
3.6 5.5 7.6 s
1.0 1.45 1.9 s
70 78 85 %
− 0.8 0.95 V
− −1.6 − mV/°C
0.3 − − V
0.3 2.0 − ms
− − 6.0 V
mA
110
130
130
130
130
130
145
180
190
200
210
215
−
−
−
−
−
−
0.45 0.65 0.9 V
− 0.5 1.0 A
V
V
CE(high)
V
CE(low)
0.9
−
−
−
−
0.3
A
I
CE(high)
I
CE(low)
V
OUT
V
OUT
DD2
OFF
I
DD1
−0.5
−0.5
1.853
2.632
2.925
3.218
3.900
4.875
−
−
−
−
−
−
0
0.15
1.9
2.7
3.0
3.3
4.0
5.0
150
150
150
150
150
150
0.5
0.5
1.948
2.768
3.075
3.383
4.100
5.125
−
−
−
−
−
−
− 13 15 A
− 0.6 1.0 A
−
−
−
−
−
−
30
39
42
45
55
70
50
60
60
60
100
100
V
ppm/°C
A
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NCP1402
2.1
2.0
1.9
1.8
, OUTPUT VOLTAGE (V)
1.7
OUT
V
1.6
0
Vin = 0.9 V
I
O
Vin = 1.2 V
604020
80 100 120 140 160 180 200 0 604020 80 100 120 140 160 180 200
, OUTPUT CURRENT (mA)
NCP1402SN19T1
L = 47 H
= 25°C
T
A
Vin = 1.5 V
Figure 3. NCP1402SN19T1 Output Voltage vs.
Output Current
6.0
Vin = 4.0 V
5.0
4.0
3.0
, OUTPUT VOLTAGE (V)
2.0
OUT
V
1.0
Vin = 1.2 V
Vin = 0.9 V
NCP1402SN50T1
L = 47 H
T
= 25°C
A
0604020 80 100 120 140 160 180 200 0 604020 80 100 120 140 160 180 200
IO, OUTPUT CURRENT (mA)
Vin = 1.5 V
Vin = 2.0 V
Vin = 3.0 V
4.0
NCP1402SN30T1
L = 47 H
3.5
3.0
2.5
, OUTPUT VOLTAGE (V)
2.0
OUT
V
1.5
= 25°C
T
A
Vin = 0.9 V
Vin = 1.5 V
Vin = 1.2 V
I
, OUTPUT CURRENT (mA)
O
Figure 4. NCP1402SN30T1 Output Voltage vs.
Output Current
100
80
60
40
EFFICIENCY (%)
20
Vin = 0.9 V Vin = 1.2 V
NCP1402SN19T1
L = 47 H
T
= 25°C
A
0
IO, OUTPUT CURRENT (mA)
Vin = 1.5 V
Vin = 2.5 V
Vin = 2.0 V
Figure 5. NCP1402SN50T1 Output Voltage vs.
Output Current
100
Vin = 2.5 V
80
Vin = 2.0 V
60
Vin = 0.9 V Vin = 1.2 V Vin = 1.5 V
40
EFFICIENCY (%)
NCP1402SN30T1
20
L = 47 H
= 25°C
T
A
0
0604020 80 100 120 140 160 180 200
IO, OUTPUT CURRENT (mA)
Figure 7. NCP1402SN30T1 Efficiency vs.
Output Current
100
80
60
40
EFFICIENCY (%)
20
0
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Figure 6. NCP1402SN19T1 Efficiency vs.
Output Current
Vin = 4.0 V
Vin = 3.0 V
Vin = 1.2 V
Vin = 0.9 V
NCP1402SN50T1
L = 47 H
= 25°C
T
A
0604020 80 100 120 140 160 180 200
IO, OUTPUT CURRENT (mA)
Vin = 1.5 V
Vin = 2.0 V
Figure 8. NCP1402SN50T1 Efficiency vs.
Output Current
Page 6
NCP1402
0
0
2.1
2.0
1.9
1.8
, OUTPUT VOLTAGE (V)
1.7
NCP1402SN19T1
OUT
V
V
= 1.9 V x 0.96
OUT
Open−Loop Test
1.6
−50
250−25
50 75 100 −50 250−25 50 75 10
TEMPERATURE (°C)
Figure 9. NCP1402SN19T1 Output Voltage vs.
Temperature
5.2
NCP1402SN50T1
V
= 5.0 V x 0.96
OUT
Open−Loop Test
5.1
5.0
3.2
3.1
3.0
2.9
, OUTPUT VOLTAGE (V)
2.8
NCP1402SN30T1
OUT
V
V
= 3.0 V x 0.96
OUT
Open−Loop Test
2.7
TEMPERATURE (°C)
Figure 10. NCP1402SN30T1 Output Voltage vs.
Temperature
100
NCP1402SN19T1
V
= 1.9 V x 0.96
OUT
Open−Loop Test
80
60
4.9
40
, OUTPUT VOLTAGE (V)
4.8
OUT
V
4.7
−50 250−25 50 75 100 −50 250−25 50 75 10
TEMPERATURE (°C)
Figure 11. NCP1402SN50T1 Output Voltage vs.
Temperature
20
, OPERATING CURRENT 1 (mA)
DD1
I
0
Figure 12. NCP1402SN19T1 Operating
Current 1 vs. Temperature
TEMPERATURE (°C)
100
NCP1402SN30T1
V
= 3.0 V x 0.96
OUT
Open−Loop Test
80
60
40
20
, OPERATING CURRENT 1 (mA)
DD1
I
0
100
NCP1402SN50T1
V
= 5.0 V x 0.96
OUT
Open−Loop Test
80
60
40
20
, OPERATING CURRENT 1 (mA)
DD1
I
0
−50 250−25 50 75 100 −50 250−25 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
, SWITCH ON TIME (s)
NCP1402SN19T1
5.5
on
t
V
= 1.9 V x 0.96
OUT
Open−Loop Test
5.0
−50
0−25
25
TEMPERATURE (°C)
Figure 15. NCP1402SN19T1 Switch On Time
vs. Temperature
7.0
6.5
6.0
50 75 100
7.5
7.0
6.5
6.0
, SWITCH ON TIME (s)
on
t
NCP1402SN30T1
5.5
V
OUT
= 3.0 V x 0.96
Open−Loop Test
5.0
−50 250−25 50 75 100
TEMPERATURE (°C)
Figure 16. NCP1402SN30T1 Switch On Time
vs. Temperature
1.9
1.8
1.7
5.5
, SWITCH ON TIME (s)
on
5.0
t
NCP1402SN50T1
V
= 5.0 V x 0.96
OUT
Open−Loop Test
4.5
−50 250−25 50 75 100
TEMPERATURE (°C)
Figure 17. NCP1402SN50T1 Switch On Time
vs. Temperature
1.8
1.7
1.6
1.5
NCP1402SN30T1
1.4
V
= 3.0 V x 0.96
, MINIMUM SWITCH OFF TIME (s)
off
t
OUT
Open−Loop Test
1.3
1.6
NCP1402SN19T1
1.5
V
= 1.9 V x 0.96
, MINIMUM SWITCH OFF TIME (s)
off
t
Open−Loop Test
1.4
OUT
−50 250−25 50 75 100
TEMPERATURE (°C)
Figure 18. NCP1402SN19T1 Minimum Switch
Off Time vs. Temperature
1.8
1.7
1.6
1.5
NCP1402SN50T1
1.4
V
= 5.0 V x 0.96
, MINIMUM SWITCH OFF TIME (s)
off
t
OUT
Open−Loop Test
1.3
−50 250−25 50 75 100 −50 250−25 50 75 100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 19. NCP1402SN30T1 Minimum Switch
Off Time vs. Temperature
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Figure 20. NCP1402SN50T1 Minimum Switch
Off Time vs. Temperature
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NCP1402
100
90
80
70
60
, MAXIMUM DUTY CYCLE (%)
D
NCP1402SN19T1
50
MAX
40
−50 250−25 50 75 100 −50 250−25 50 75 100
= 1.9 V x 0.96
V
OUT
Open−Loop Test
TEMPERATURE (°C)
Figure 21. NCP1402SN19T1 Maximum Duty
Cycle vs. T emperature
100
90
100
90
80
70
60
, MAXIMUM DUTY CYCLE (%)
D
50
MAX
40
NCP1402SN30T1
= 3.0 V x 0.96
V
OUT
Open−Loop Test
TEMPERATURE (°C)
Figure 22. NCP1402SN30T1 Maximum Duty
Cycle vs. T emperature
200
180
80
160
70
140
60
, MAXIMUM DUTY CYCLE (%)
D
MAX
50
40
NCP1402SN50T1
V
= 5.0 V x 0.96
OUT
Open−Loop Test
TEMPERATURE (°C)
, LX PIN ON−STATE CURRENT (mA)
LX
I
NCP1402SN19T1
V
V
OUT
LX
120
Open−Loop Test
100
−50 250−25 50 75 100−50 250−25 50 75 100
= 1.9 V x 0.96
= 0.4 V
TEMPERATURE (°C)
Figure 23. NCP1402SN50T1 Maximum Duty
250
230
210
190
NCP1402SN30T1
170
V
= 3.0 V x 0.96
OUT
= 0.4 V
V
, LX PIN ON−STATE CURRENT (mA)
LX
I
150
LX
Open−Loop Test
Cycle vs. T emperature
Figure 24. NCP1402SN19T1 LX Pin On−State
Current vs. Temperature
300
275
250
225
NCP1402SN50T1
200
V
= 5.0 V x 0.96
OUT
= 0.4 V
V
, LX PIN ON−STATE CURRENT (mA)
LX
I
175
LX
Open−Loop Test
−50 250−25 50 75 100 −50 250−25 50 75 100
TEMPERATURE (°C)
Figure 25. NCP1402SN30T1 LX Pin On−State
Current vs. Temperature
Figure 26. NCP1402SN50T1 LX Pin On−State
TEMPERATURE (°C)
Current vs. Temperature
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NCP1402
1.0
0.8
0.6
VOLTAGE LIMIT (V)
0.4
LX
, V
0.2
LXLIM
NCP1402SN19T1
V
Open−Loop Test
0.0
−50 250−25 50 75 100
TEMPERATURE (°C)
Figure 27. NCP1402SN19T1 VLX Voltage Limit
vs. Temperature
1.0
0.8
1.0
0.8
0.6
VOLTAGE LIMIT (V)
0.4
LX
, V
0.2
LXLIM
V
NCP1402SN30T1
Open−Loop Test
0.0
−50 250−25 50 75 100
TEMPERATURE (°C)
Figure 28. NCP1402SN30T1 VLX Voltage Limit
vs. Temperature
4.0
3.5
3.0
0.6
2.5
VOLTAGE LIMIT (V)
0.4
LX
, V
0.2
LXLIM
V
NCP1402SN50T1
Open−Loop Test
0.0
−50 250−25 50 75 100 −50 250−25 50 75 100
TEMPERATURE (°C)
2.0
, SWITCH−ON RESISTANCE ()
1.5
DS(on)
1.0
NCP1402SN19T1
V
= 1.9 V x 0.96
OUT
= 0.4 V
V
LX
Open−Loop Test
TEMPERATURE (°C)
Figure 29. NCP1402SN50T1 VLX Voltage Limit
vs. Temperature
3.0
2.5
2.0
1.5
1.0
NCP1402SN30T1
V
, SWITCH−ON RESISTANCE ()
0.5
DS(on)
R
0.0
= 3.0 V x 0.96
OUT
= 0.4 V
V
LX
Open−Loop Test
3.0
2.5
2.0
1.5
1.0
, SWITCH−ON RESISTANCE ()R
0.5
DS(on)
R
0.0
Figure 30. NCP1402SN19T1 Switch−on
Resistance vs. T emperature
NCP1402SN50T1
V
= 5.0 V x 0.96
OUT
= 0.4 V
V
LX
Open−Loop Test
−50 250−25 50 75 100 −50 250−25 50 75 100
TEMPERATURE (°C)
Figure 31. NCP1402SN30T1 Switch−on
Resistance vs. T emperature
Figure 32. NCP1402SN50T1 Switch−on
TEMPERATURE (°C)
Resistance vs. T emperature
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NCP1402
1.0
0.8
0.6
0.4
, STARTUP/HOLD VOLTAGE (V)
0.2
hold
/V
0.0
start
V
−50
1.0
0.8
0.6
0.4
, STARTUP/HOLD VOLTAGE (V)
0.2
hold
/V
start
0.0
V
−50
V
start
NCP1402SN19T1
L = 22 H
= 10 F
C
OUT
I
= 0 mA
O
V
hold
0
25−25
50
TEMPERATURE (°C)
Figure 33. NCP1402SN19T1 Startup/Hold
Voltage vs. Temperature
V
start
NCP1402SN50T1
L = 22 H
= 10 F
C
OUT
I
= 0 mA
O
V
hold
25−25
TEMPERATURE (°C)
50
75 100
75 1000
1.0
V
0.8
NCP1402SN30T1
0.6
L = 22 H
= 10 F
C
OUT
0.4
I
= 0 mA
O
, STARTUP/HOLD VOLTAGE (V)
0.2
hold
/V
0.0
start
V
−50 5025−25
V
TEMPERATURE (°C)
Figure 34. NCP1402SN30T1 Startup/Hold
Voltage vs. Temperature
2.0
1.5
1.0
0.5
, STARTUP/HOLD VOLTAGE (V)
hold
/V
0.0
start
V
040503020 6010 70
V
start
V
hold
IO, OUTPUT CURRENT (mA)
start
hold
75 1000
NCP1402SN19T1
L = 47 H
= 68 F
C
OUT
T
= 25°C
A
80 90 100
Figure 35. NCP1402SN50T1 Startup/Hold
Voltage vs. Temperature
2.0
1.5
V
start
1.0
V
hold
, STARTUP/HOLD VOLTAGE (V)
0.5
hold
/V
start
0.0
V
040503020 6010 70
I
, OUTPUT CURRENT (mA)
O
Figure 37. NCP1402SN30T1 Startup/Hold
Voltage vs. Output Current
NCP1402SN30T1
L = 47 H
= 68 F
C
OUT
T
= 25°C
A
80 90 100
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Figure 36. NCP1402SN19T1 Startup/Hold
Voltage vs. Output Current
2.0
1.5
V
start
1.0
, STARTUP/HOLD VOLTAGE (V)
0.5
V
hold
/V
start
V
0.0
hold
040503020 6010 70
I
, OUTPUT CURRENT (mA)
O
Figure 38. NCP1402SN50T1 Startup/Hold
Voltage vs. Output Current
NCP1402SN50T1
L = 47 H
= 68 F
C
OUT
T
= 25°C
A
80 90 100
Page 11
NCP1402
5 s/div
V
= 1.9 V, Vin = 1.2 V, IO = 30 mA, L = 47 H, C
OUT
1. V
, 1.0 V/div
LX
2. V
3. I
, 20 mV/div, AC coupled
OUT
, 100 mA/div
L
Figure 39. NCP1402SN19T1 Operating
Waveforms (Medium Load)
2 s/div
= 3.0 V, Vin = 1.2 V, IO = 30 mA, L = 47 H, C
V
OUT
1. V
, 2.0 V/div
LX
2. V
3. I
, 20 mV/div, AC coupled
OUT
, 100 mA/div
L
Figure 41. NCP1402SN30T1 Operating
Waveforms (Medium Load)
OUT
OUT
= 68 F
= 68 F
5 s/div
V
= 1.9 V, Vin = 1.2 V, IO = 70 mA, L = 47 H, C
OUT
1. V
, 1.0 V/div
LX
2. V
3. I
, 20 mV/div, AC coupled
OUT
, 100 mA/div
L
Figure 40. NCP1402SN19T1 Operating
Waveforms (Heavy Load)
2 s/div
V
= 3.0 V, Vin = 1.2 V, IO = 70 mA, L = 47 H, C
OUT
1. V
, 2.0 V/div
LX
2. V
3. I
, 20 mV/div, AC coupled
OUT
, 100 mA/div
L
Figure 42. NCP1402SN30T1 Operating
Waveforms (Heavy Load)
OUT
OUT
= 68 F
= 68 F
2 s/div
= 5.0 V, Vin = 1.5 V, IO = 30 mA, L = 47 H, C
V
OUT
1. V
, 2.0 V/div
LX
2. V
3. I
, 20 mV/div, AC coupled
OUT
, 100 mA/div
L
Figure 43. NCP1402SN50T1 Operating
Waveforms (Medium Load)
= 68 F
OUT
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2 s/div
= 5.0 V, Vin = 1.5 V, IO = 60 mA, L = 47 H, C
V
OUT
1. V
, 2.0 V/div
LX
2. V
3. I
, 20 mV/div, AC coupled
OUT
, 100 mA/div
L
OUT
= 68 F
Figure 44. NCP1402SN50T1 Operating
Waveforms (Heavy Load)
11
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NCP1402
Vin = 1.2 V, L = 47 H, C
1. V
2. I
= 1.9 V (AC coupled), 100 mV/div
OUT
= 0.1 mA to 80 mA
O
OUT
= 68 F
Figure 45. NCP1402SN19T1 Load Transient
Response
V
= 1.5 V, L = 47 H, C
in
1. V
2. I
= 3.0 V (AC coupled), 100 mV/div
OUT
= 0.1 mA to 80 mA
O
OUT
= 68 F
Figure 47. NCP1402SN30T1 Load Transient
Response
V
= 1.2 V, L = 47 H, C
in
1. V
2. I
= 1.9 V (AC coupled), 100 mV/div
OUT
= 80 mA to 0.1 mA
O
OUT
= 68 F
Figure 46. NCP1402SN19T1 Load Transient
Response
V
= 1.5 V, L = 47 H, C
in
1. V
2. I
= 3.0 V (AC coupled), 100 mV/div
OUT
= 80 mA to 0.1 mA
O
OUT
= 68 F
Figure 48. NCP1402SN30T1 Load Transient
Response
V
= 2.4 V, L = 47 H, C
in
1. V
2. I
= 5.0 V (AC coupled), 100 mV/div
OUT
= 0.1 mA to 80 mA
O
OUT
= 68 F
Figure 49. NCP1402SN50T1 Load Transient
Response
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12
V
= 2.4 V, L = 47 H, C
in
1. V
2. I
= 5.0 V (AC coupled), 100 mV/div
OUT
= 80 mA to 0.1 mA
O
OUT
= 68 F
Figure 50. NCP1402SN50T1 Load Transient
Response
Page 13
NCP1402
0
100
NCP1402SN19T1
L = 47 H
= 68 F
C
80
OUT
= 25°C
T
A
60
40
Vin = 1.2 V
Vin = 1.5 V
, RIPPLE VOLTAGE (mV)
20
ripple
V
Vin = 0.9 V
0
0
604020
80 100 120 140 160 180 200
I
, OUTPUT CURRENT (mA)
O
Figure 51. NCP1402SN19T1 Ripple Voltage vs.
Output Current
100
80
60
40
, RIPPLE VOLTAGE (mV)
20
ripple
V
0
0
Vin = 1.5 V
Vin = 1.2 V
Vin = 0.9 V
80 100 120 140 160 180 200
604020
IO, OUTPUT CURRENT (mA)
Vin = 4.0 V
Vin = 2.0 V
NCP1402SN50T1
L = 47 H
C
OUT
T
= 25°C
A
Vin = 3.0 V
= 68 F
100
NCP1402SN30T1
L = 47 H
= 68 F
C
80
OUT
T
= 25°C
60
40
A
Vin = 0.9 V
Vin = 1.2 V
Vin = 1.5 V
Vin = 2.0 V
Vin = 2.5 V
, RIPPLE VOLTAGE (mV)
20
ripple
V
0
0
604020
80 100 120 140 160 180 20
I
, OUTPUT CURRENT (mA)
O
Figure 52. NCP1402SN30T1 Ripple Voltage vs.
Output Current
100
80
85°C
60
−40°C
40
20
, OPERATING CURRENT 1 (mA)
DD1
I
0
NCP1402SNXXT1
V
= V
OUT
Open−loop Test
13425
V
, OUTPUT VOLTAGE (V)
OUT
SET
25°C
x 0.96
6
Figure 53. NCP1402SN50T1 Ripple Voltage vs.
Output Current
300
−40°C
260
220
180
25°C
85°C
NCP1402SNXXT1
140
, LX PIN ON−STATE CURRENT (mA)
LX
I
100
V
= V
V
OUT
LX
= 0.4 V
SET
x 0.96
Open−loop Test
13425
V
, OUTPUT VOLTAGE (V)
OUT
, SWITCH−ON RESISTANCE ()
DS(ON)
R
6
Figure 55. NCP1402SNXXT1 Pin On−state
Current vs. Output Voltage
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13
Figure 54. NCP1402SNXXT1 Operating
Current 1 vs. Output Voltage
3.5
3.0
2.5
2.0
1.5
1.0
13425
V
, OUTPUT VOLTAGE (V)
OUT
NCP1402SNXXT1
V
= V
V
OUT
LX
= 0.4 V
SET
x 0.96
Open−loop Test
25°C
−40°C
85°C
6
Figure 56. NCP1402SNXXT1 Switch−On
Resistance vs. Output Voltage
Page 14
NCP1402
400
300
200
100
, MAX. OUTPUT CURRENT (mA)
O(max)
I
0
0
3.0 V
2.7 V
1.9 V
12345
V
in
3.3 V 5.0 V
NCP1402SNXXT1
L = 47 H
T
, INPUT VOLTAGE (V)
Figure 58. NCP1402SNXXT1 Maximum Output
Current vs. Input Voltage
= 25°C
A
, NO LOAD INPUT CURRENT (A)
load)
in(no
I
150
125
100
75
50
25
5.0 V
3.3 V
3.0 V
2.7 V
1.9 V
0
0
, INPUT VOLTAGE (V)
V
in
321
NCP1402SNXXT1
L = 47 H
I
T
Figure 57. NCP1402SNXXT1 No Load Input
Current vs. Input Voltage
= 0 mA
O
= 25°C
A
45
6
DETAILED OPERATING DESCRIPTION
Operation
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
Soft−Start
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 a pproximately 1 .5 V a t a f ixed d uty cycle, t he
level at which the converter can operate normally. What is
more, the startup capability w ith heavy loads is also i mproved.
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 A
(V
= 1.9 V), and can be further reduced to about 0.6 A
OUT
when the chip is disabled (VCE < 0.3 V).
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.
Regulated Converter Voltage (V
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.
Enable / Disable Operation
The NCP1402 series offer IC shut−down mode by chip
enable pin (CE pin) to reduce current consumption. An
internal pullup 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
OUT
)
is disabled, which means IC is shutdown.
Impor tant: 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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NCP1402
APPLICATIONS CIRCUIT INFORMATION
V
in
C1
10 F
CE
OUT
NC
47 H
1
NCP1402
2
3
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:
Calculation Equation
2
V
L
I
PK
I
min
t
off
Q
V
ripple
*NOTES:
− Peak inductor current
I
PK
I
− Minimum inductor current
min
− Desired dc output current
I
O
− Desired maximum dc output current
I
Omax
I
− Average inductor current
L
− Nominal operating dc input voltage
V
in
V
− Desired dc output voltage
OUT
− Diode forward voltage
V
F
− Saturation voltage of the internal FET switch
V
S
Q − Charge stores in the C
− Output ripple voltage
V
ripple
ESR − Equivalent series resistance of the output capacitor
M − An empirical factor, when V
M = 8 x 10
M
(Vin Vs)t
(ton t
t
off
off)IO
(V
OUT
(IL IO)t
Q
C
OUT
OUT
−6
, otherwise M = 5.3 x 10−6.
in
V
OUTIOmax
on
I
L
(Vin Vs)t
min
(Vin VS)t
2L
on
VF Vin)
off
(IL IO)ESR
during charging up
≥ 3.0 V,
OUT
on
EXTERNAL COMPONENT SELECTION
Inductor
The NCP1402 is designed to work well with a 47 H
inductor in most applications. 47 H is a sufficiently low
value to allow the use of a small surface mount coil, but large
L1
LX
5
GND
4
D1
V
C2
68 F
OUT
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 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
to m inimize l oss. I t i s n ecessary t o c hoose a n i nductor w ith
saturation current greater than the peak current which the
inductor will encounter in the application.
Diode
The diode is the main source of loss in DC−DC converters.
The most importance parameters which affect their
efficiency are the forward voltage drop, VF, and the 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 junction. A
Schottky diode with the following characteristics is
recommended:
Small forward voltage, V
< 0.3 V
F
Small reverse leakage current
Fast reverse recovery time/ switching speed
Rated current larger than peak inductor current,
I
> I
rated
PK
Reverse voltage larger than output voltage,
V
> V
reverse
OUT
Input Capacitor
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 value of 10 F should be suitable.
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NCP1402
Output Capacitor
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 to 0.30 ) 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.
An evaluation board of NCP1402 has been made in the
size of 2 3 m m x 2 0 m m 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:
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 Phone
Inductor, L1 Sumida Electric Co. Ltd. CD54−470L Inductor 47 H / 0.72 A (852)−2880−6688
Schottky Diode, D1 ON Semiconductor Corp. MBR0520LT1 Schottky Power Rectifier (852)−2689−0088
Output Capacitor, C2 KEMET Electronics Corp. T494D686K010AS
Input Capacitor, C1 KEMET Electronics Corp. T491C106K016AS
PCB Layout Hints
Low ESR Tantalum Capacitor
68 F / 10 V
Low Profile Tantalum Capacitor
10 F / 16 V
(852)−2305−1168
(852)−2305−1168
Grounding
One point grounding should be used for the output power
return ground, the input power return g round, a nd t he d evice
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.
Power Signal Traces
Low resistance conducting paths should be used for the
power carrying traces to reduce power loss so as to improve
TP1
V
in
CE
1
OUT
2
NC
3
10 F/16 V
TP4
GND
++
C1
JP1
Enable
On
Off
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 Lx pin of U1
3. Trace from L1 to anode pin of D1
4. Trace from cathode pin of D1 to TP2
Output Capacitor
The output capacitor should be placed close to the output
terminals to obtain better smoothing effect on the output
ripple.
L1
47 H
NCP1402
D1
MBR0520LT1
LX
5
GND
6
TP2
V
C2
68 F/10 V
TP3
GND
out
Figure 62. NCP1402 Evaluation Board Schematic Diagram
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0.05 (0.002)
S
H
D
54
123
L
G
A
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.
2. CONTROLLING DIMENSION: MILLIMETER.
3. MAXIMUM LEAD THICKNESS INCLUDES
B
J
C
K
M
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.
DIM MIN MAX MIN MAX
A 2.90 3.10 0.1142 0.1220
B 1.30 1.70 0.0512 0.0669
C 0.90 1.10 0.0354 0.0433
D 0.25 0.50 0.0098 0.0197
G 0.85 1.05 0.0335 0.0413
H 0.013 0.100 0.0005 0.0040
J 0.10 0.26 0.0040 0.0102
K 0.20 0.60 0.0079 0.0236
L 1.25 1.55 0.0493 0.0610
M 0 10 0 10
___ _
S 2.50 3.00 0.0985 0.1181
INCHESMILLIMETERS
SOLDERING FOOTPRINT*
1.9
0.95
0.037
1.0
0.039
*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.
0.074
0.7
0.028
2.4
0.094
SCALE 10:1
inches
mm
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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For additional information, please contact your
local Sales Representative.
NCP1402/D
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