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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.
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.
Features
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5
1
TSOP−5
SN SUFFIX
CASE 483
MARKING DIAGRAM AND
PIN CONNECTIONS
CE
OUT
NC
1
xxxAYWG
G
2
3
(Top View)
xxx =Specific Device Marking
A
= Assembly Location
Y
= Year
W = Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
5
EXT
•
High Efficiency 86% at I
O
= 200 mA, V
IN
= 2.0 V, V
OUT
= 3.0 V
•
•
•
•
•
•
•
•
•
•
•
•
•
•
88% at I
O
= 400 mA, V
IN
= 3.0 V, V
OUT
= 5.0 V
Low Startup Voltage of 0.9 V typical at I
O
= 1.0 mA
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%
Low Conversion Ripple
High Output Current up to 1000 mA
(3.0 V version at V
IN
= 2.0 V, L = 10
mH,
C
OUT
= 220
mF)
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
4
GND
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
December, 2005 − Rev. 7
Publication Order Number:
NCP1450A/D
NCP1450A
V
IN
CE
1
OUT
2
NC
3
EXT
5
V
OUT
NCP1450A
GND
4
Figure 1. Typical Step−up Converter Application
OUT
2
NC
3
+
−
Error
Amplifier
PWM
Controller
Driver
EXT
5
Phase
Compensation
Voltage
Reference
180 kHz
Oscillator
Soft−Start
GND
4
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTION
Pin #
1
Symbol
CE
Pin Description
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.
Output voltage monitor pin and also the power supply pin for the device.
No internal connection to this pin.
Ground pin.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
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Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
Á
Á
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
2
3
4
5
OUT
NC
GND
EXT
External transistor drive pin.
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2
NCP1450A
ORDERING INFORMATION
(Note 1)
Device
NCP1450ASN19T1
NCP1450ASN19T1G
NCP1450ASN27T1G
NCP1450ASN27T1
NCP1450ASN30T1
NCP1450ASN30T1G
NCP1450ASN33T1
NCP1450ASN33T1G
NCP1450ASN50T1
NCP1450ASN50T1G
5.0 V
DBD
3.3 V
DBC
3.0 V
180 KHz
DBA
2.7 V
DAZ
1.9 V
DAY
Output
Voltage
Switching
Frequency
Marking
Package
TSOP−5
TSOP−5
(Pb−Free)
TSOP−5
TSOP−5
(Pb−Free)
TSOP−5
TSOP−5
(Pb−Free)
TSOP−5
TSOP−5
(Pb−Free)
TSOP−5
TSOP−5
(Pb−Free)
3000 Units
on 7 Inch Reel
Shipping
†
†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
Power Supply Voltage (Pin 2)
Input/Output Pins
EXT (Pin 5)
EXT Sink/Source Current
CE (Pin 1)
Input Voltage Range
Input Current Range
Symbol
V
OUT
V
EXT
I
EXT
V
CE
I
CE
Value
6.0
Unit
V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
Á
Á
Á
Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
Á
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á ÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
Á
−0.3 to 6.0
−150 to 150
−0.3 to 6.0
−150 to 150
500
250
V
mA
V
mA
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation @ T
A
= 25°C
Thermal Resistance Junction−to−Air
Operating Ambient Temperature Range
P
D
R
qJA
T
A
T
J
mW
°C/W
°C
°C
°C
−40 to +85
Operating Junction Temperature Range
Storage Temperature Range
−40 to +150
−55 to +150
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
A
= 25°C, unless otherwise noted.)
Characteristic
OSCILLATOR
Frequency (V
OUT
= V
SET
0.96, Note 5)
f
OSC
Df
D
MAX
V
start
DV
start
V
hold
t
SS
144
−
70
−
−
−
−
180
0.11
80
0.8
−1.6
0.6
100
216
−
90
0.9
−
0.7
250
kHz
%/°C
%
V
mV/°C
V
ms
Symbol
Min
Typ
Max
Unit
Frequency Temperature Coefficient (T
A
= −40°C to 85°C)
Maximum PWM Duty Cycle (V
OUT
= V
SET
Minimum Startup Voltage (I
O
= 0 mA)
Minimum Startup Voltage Temperature Coefficient (T
A
= −40°C to 85°C)
Minimum Operation Hold Voltage (I
O
= 0 mA)
Soft−Start Time (V
OUT
= V
SET,
Note 6)
CE (PIN 1)
CE Input Voltage (V
OUT
= V
SET
High State, Device Enabled
Low State, Device Disabled
0.96)
0.96)
V
V
CE(high)
V
CE(low)
I
CE(high)
I
CE(low)
0.9
−
−0.5
0
−
−
0
0.15
−
0.3
mA
0.5
0.5
CE Input Current (Note 6)
High State, Device Enabled (V
OUT
= V
CE
= 5.0 V)
Low State, Device Disabled (V
OUT
= 5.0 V, V
CE
= 0 V)
EXT (PIN 5)
EXT “H” Output Current (V
EXT
= V
OUT
−0.4 V)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
EXT “L” Output Current(V
EXT
= 0.4 V)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
TOTAL DEVICE
Output Voltage
Device Suffix:
19T1
27T1
30T1
33T1
50T1
Output Voltage Temperature Coefficient (T
A
= −40 to +85°C)
Operating Current (V
OUT
= V
CE
= V
SET
Device Suffix:
19T1
27T1
30T1
33T1
50T1
0.96, Note 5)
I
EXTH
−
−
−
−
−
I
EXTL
20.0
30.0
30.0
30.0
35.0
38.3
48.0
50.8
52.0
58.2
−
−
−
−
−
−25.0
−35.0
−37.7
−40.0
−53.7
−20.0
−30.0
−30.0
−30.0
−35.0
mA
mA
V
OUT
1.853
2.633
2.925
3.218
4.875
DV
OUT
I
DD
−
−
−
−
−
I
STB
I
OFF
−
−
55
93
98
103
136
15
0.6
90
140
150
160
220
20
1.5
−
1.9
2.7
3.0
3.3
5.0
150
1.948
2.768
3.075
3.383
5.125
−
V
ppm/°C
mA
Standby Current (V
OUT
= V
CE
= V
SET
+0.5 V)
Off−State Current (V
OUT
= 5.0 V, V
CE
= 0 V, T
A
= −40 to +85°C, Note 7)
5. V
SET
means setting of output voltage.
6. This parameter is guaranteed by design.
7. CE pin is integrated with an internal 150 nA pullup current source.
mA
mA
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4
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