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
in
= 2.0 V, V
OUT
= 3.0 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
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SOT23−5
(TSOP−5, SC59−5)
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
CE
OUT
NC
1
2
3
5
LX
xxxAYW
G
G
4
GND
Extremely Low Startup Voltage of 0.8 V
Operation Down to Less than 0.3 V
High Efficiency 85% (V
in
= 2.0 V, V
OUT
= 3.0 V, 70 mA)
Low Operating Current of 30
mA
(V
OUT
= 1.9 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
Pb−Free Packages are Available
(Top View)
xxx
A
Y
W
G
= Marking
= Assembly Location
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 18 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, 2013
March, 2013
−
Rev. 9
1
Publication Order Number:
NCP1402/D
NCP1402
V
in
CE
1
OUT
NCP1402
2
NC
3
LX
5
V
OUT
GND
4
Figure 1. Typical Step−Up Converter Application
OUT
2
V
LX
LIMITER
LX
5
NC
3
−
+
VOLTAGE
REFERENCE
PFM
COMPARATOR
DRIVER
POWER
SWITCH
PFM
CONTROLLER
SOFT−START
PFM
OSCILLATOR
GND
4
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin #
1
Symbol
CE
Pin Description
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
Output voltage monitor pin, also the power supply pin of the device
No internal connection to this pin
Ground pin
External inductor connection pin to power switch drain
2
3
4
5
OUT
NC
GND
LX
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2
NCP1402
ABSOLUTE MAXIMUM RATINGS
Rating
Power Supply Voltage (Pin 2)
Input/Output Pins
LX (Pin 5)
LX Peak Sink Current
CE (Pin 1)
Input Voltage Range
Input Current Range
Thermal Resistance, Junction−to−Air
Operating Ambient Temperature Range (Note 2)
Operating Junction Temperature Range
Storage Temperature Range
Symbol
V
OUT
V
LX
I
LX
V
CE
I
CE
R
qJA
T
A
T
J
T
stg
Value
6.0
−0.3
to 6.0
400
−0.3
to 6.0
−150
to 150
250
−40
to +85
−40
to +125
−55
to +150
Unit
V
V
mA
V
mA
C/W
C
C
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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)
150
V per JEDEC standard: JESD22−A115.
2. The maximum package power dissipation limit must not be exceeded.
TJ(max)
*
TA
PD
+
R
qJA
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
NCP1402
ELECTRICAL CHARACTERISTICS
(For all values T
A
= 25C, unless otherwise noted.)
Characteristic
OSCILLATOR
Switch On Time (current limit not asserted)
Switch Minimum Off Time
Maximum Duty Cycle
Minimum Startup Voltage (I
O
= 0 mA)
Minimum Startup Voltage Temperature Coefficient (T
A
=
−40C
to 85C)
Minimum Operation Hold Voltage (I
O
= 0 mA)
Soft−Start Time (V
OUT
u
0.8 V)
LX (PIN 5)
Internal Switching N−Channel FET Drain Voltage
LX Pin On−State Sink Current (V
LX
= 0.4 V)
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
Voltage Limit
Off−State Leakage Current (V
LX
= 6.0 V, T
A
=
−40C
to 85C)
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
OUT
= V
CE
= 6.0 V)
Low State, Device Disabled (V
OUT
= 6.0 V, V
CE
= 0 V)
TOTAL DEVICE
Output Voltage
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
Output Voltage Temperature Coefficient (T
A
=
−40C
to +85C)
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
Operating Current 2 (V
OUT
= V
CE
= V
SET
+0.5 V, Note 5)
Off−State Current (V
OUT
= 5.0 V, V
CE
= 0 V, T
A
=
−40C
to +85C, Note 6)
Operating Current 1 (V
OUT
= V
CE
= V
SET
x 0.96)
Device Suffix:
19T1
27T1
30T1
33T1
40T1
50T1
5. V
SET
means setting of output voltage.
6. CE pin is integrated with an internal 10 MW pullup resistor.
V
OUT
1.853
2.632
2.925
3.218
3.900
4.875
DV
OUT
−
−
−
−
−
−
I
DD2
I
OFF
I
DD1
−
−
−
−
−
−
30
39
42
45
55
70
50
60
60
60
100
100
−
−
150
150
150
150
150
150
13
0.6
−
−
−
−
−
−
15
1.0
mA
mA
mA
1.9
2.7
3.0
3.3
4.0
5.0
1.948
2.768
3.075
3.383
4.100
5.125
ppm/C
V
V
V
CE(high)
V
CE(low)
I
CE(high)
I
CE(low)
0.9
−
−0.5
−0.5
−
−
0
0.15
−
0.3
0.5
0.5
mA
V
LX
I
LX
110
130
130
130
130
130
V
LXLIM
I
LKG
0.45
−
145
180
190
200
210
215
0.65
0.5
−
−
−
−
−
−
0.9
1.0
V
mA
−
−
6.0
V
mA
t
on
t
off
D
MAX
V
start
DV
start
V
hold
t
SS
3.6
1.0
70
−
−
0.3
0.3
5.5
1.45
78
0.8
−1.6
−
2.0
7.6
1.9
85
0.95
−
−
−
ms
ms
%
V
mV/C
V
ms
Symbol
Min
Typ
Max
Unit
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4
NCP1402
2.1
V
OUT
, OUTPUT VOLTAGE (V)
2.0
1.9
V
in
= 0.9 V
1.8
1.7
1.6
V
in
= 1.2 V
V
in
= 1.5 V
V
OUT
, OUTPUT VOLTAGE (V)
NCP1402SN19T1
L = 47mH
T
A
= 25C
4.0
3.5
3.0
V
in
= 0.9 V
2.5
2.0
1.5
V
in
= 1.2 V
V
in
= 1.5 V
NCP1402SN30T1
L = 47mH
T
A
= 25C
V
in
= 2.5 V
V
in
= 2.0 V
0
20
40
60
80
100 120 140 160 180 200
0
20
40
60
80
100 120 140 160 180 200
I
O
, OUTPUT CURRENT (mA)
I
O
, OUTPUT CURRENT (mA)
Figure 3. NCP1402SN19T1 Output Voltage vs.
Output Current
Figure 4. NCP1402SN30T1 Output Voltage vs.
Output Current
6.0
V
OUT
, OUTPUT VOLTAGE (V)
V
in
= 4.0 V
5.0
4.0
3.0
2.0
1.0
V
in
= 1.2 V
V
in
= 0.9 V
V
in
= 2.0 V
V
in
= 3.0 V
EFFICIENCY (%)
V
in
= 1.5 V
100
80
60
40
20
0
NCP1402SN19T1
L = 47mH
T
A
= 25C
0
20
40
60
80
100 120 140 160 180 200
V
in
= 1.5 V
V
in
= 0.9 V
V
in
= 1.2 V
NCP1402SN50T1
L = 47mH
T
A
= 25C
0
20
40
60
80
100 120 140 160 180 200
I
O
, OUTPUT CURRENT (mA)
I
O
, OUTPUT CURRENT (mA)
Figure 5. NCP1402SN50T1 Output Voltage vs.
Output Current
100
V
in
= 2.5 V
80
EFFICIENCY (%)
EFFICIENCY (%)
V
in
= 2.0 V
60
40
20
0
NCP1402SN30T1
L = 47mH
T
A
= 25C
0
20
40
60
80
100 120 140 160 180 200
V
in
= 0.9 V
V
in
= 1.2 V
V
in
= 1.5 V
80
100
Figure 6. NCP1402SN19T1 Efficiency vs.
Output Current
V
in
= 4.0 V
V
in
= 3.0 V
V
in
= 1.2 V
V
in
= 1.5 V
V
in
= 2.0 V
60
V
in
= 0.9 V
40
20
0
NCP1402SN50T1
L = 47mH
T
A
= 25C
0
20
40
60
80
100 120 140 160 180 200
I
O
, OUTPUT CURRENT (mA)
I
O
, OUTPUT CURRENT (mA)
Figure 7. NCP1402SN30T1 Efficiency vs.
Output Current
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5
Figure 8. NCP1402SN50T1 Efficiency vs.
Output Current
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