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CD54-470L Datasheet

200 mA/ PFM Step-Up Micropower Switching Regulator

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CD54-470L pdf
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
to 200 mA of output current at Vin = 2.0 V, VOUT = 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
Extremely Low Start−Up Voltage of 0.8 V
Operation Down to Less than 0.3 V
High Efficiency 85% (Vin = 2.0 V, VOUT = 3.0 V, 70 mA)
Low Operating Current of 30 mA (VOUT = 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
Typical Applications
Cellular Telephones
Pagers
Personal Digital Assistants (PDA)
Electronic Games
Portable Audio (MP3)
Camcorders
Digital Cameras
Handheld Instruments
http://onsemi.com
5
1
SOT23−5
(TSOP−5, SC59−5)
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
CE 1
OUT 2
NC 3
5 LX
4 GND
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.
© Semiconductor Components Industries, LLC, 2003
November, 2003 − Rev. 5
1
Publication Order Number:
NCP1402/D


  ON Semiconductor Electronic Components Datasheet  

CD54-470L Datasheet

200 mA/ PFM Step-Up Micropower Switching Regulator

No Preview Available !

CD54-470L pdf
OUT
2
NC
3
GND
4
NCP1402
Vin
CE LX
15
OUT NCP1402
2
NC GND
34
VOUT
Figure 1. Typical Step−Up Converter Application
VLX LIMITER
PFM
COMPARATOR
+
VOLTAGE
REFERENCE
SOFT−START
DRIVER
PFM
CONTROLLER
PFM
OSCILLATOR
LX
5
POWER
SWITCH
1 CE
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin #
1
2
3
4
5
Symbol
CE
OUT
NC
GND
LX
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
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2


Part Number CD54-470L
Description 200 mA/ PFM Step-Up Micropower Switching Regulator
Maker ON Semiconductor
Total Page 18 Pages
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