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NCP1450A Datasheet

PWM Step-up DC-DC Controller

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NCP1450A pdf
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
High Efficiency 86% at IO = 200 mA, VIN = 2.0 V, VOUT = 3.0 V
88% at IO = 400 mA, VIN = 3.0 V, VOUT = 5.0 V
Low Startup Voltage of 0.9 V typical at IO = 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 VIN = 2.0 V, L = 10 mH, COUT = 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
Typical Applications
Personal Digital Assistant (PDA)
Electronic Games
Portable Audio (MP3)
Digital Still Cameras
Handheld Instruments
http://onsemi.com
5
1
TSOP−5
SN SUFFIX
CASE 483
MARKING DIAGRAM AND
PIN CONNECTIONS
CE 1
OUT 2
NC 3
5 EXT
4 GND
(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)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 3 of this data sheet.
© Semiconductor Components Industries, LLC, 2005
December, 2005 − Rev. 7
1
Publication Order Number:
NCP1450A/D


  ON Semiconductor Electronic Components Datasheet  

NCP1450A Datasheet

PWM Step-up DC-DC Controller

No Preview Available !

NCP1450A pdf
OUT
2
NC
3
GND
4
NCP1450A
VIN
CE
1
OUT
2
NC
3
EXT
5
GND
4
VOUT
Figure 1. Typical Step−up Converter Application
+
Voltage
Reference
Error
Amplifier
Phase
Compensation
Soft−Start
PWM
Controller
180 kHz
Oscillator
Driver
EXT
5
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTION
Pin #
1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5
Symbol
CE
OUT
NC
GND
EXT
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.
External transistor drive pin.
http://onsemi.com
2


Part Number NCP1450A
Description PWM Step-up DC-DC Controller
Maker ON
Total Page 22 Pages
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