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NCP1423 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1423
Description  400 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1423 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 5
1
Publication Order Number:
NCP1423/D
NCP1423
400 mA Sync−Rect PFM
Step−Up DC−DC Converter
with True−Cutoff and
Ring−Killer
NCP1423 is a monolithic micropower high frequency step−up
switching converter IC specially designed for battery operated
hand−held electronic products. It integrates Synchronous Rectifier for
improving efficiency as well as eliminating the external Schottky
Diode. High switching frequency (up to 600 kHz) allows low profile
inductor and output capacitor being used. When the IC is disabled,
internal conduction path from LX or BAT to OUT is blocked, OUT pin
is isolated from the battery. This achieves True−Cutoff. Ring−Killer is
also integrated to eliminate the high frequency ringing in discontinuous
conduction mode. Low−Battery Detector, Cycle−by−Cycle Current
Limit, Overvoltage Protection and Thermal Shutdown provide
value−added features for various battery operated application. With all
of these functions ON, the quiescent supply current is only 9.0
mA. This
device is available in compact Micro10 package.
Features
High Efficiency: 92% for 3.3 V Output@ 400 mA from 2.5 V Input
87% for 1.8 V Output@ 70 mA from 1.2 V Input
High Switching Frequency, up to 600 kHz (not hitting current limit)
Low Quiescent Current of 9.0 mA
Low Battery Detector
0.8 V Startup
External Adjustable Output Voltage
±1.5% Output Voltage Accuracy
Ring−Killer for Discontinuous Conduction Mode
Thermal Shutdown
1.2 A Cycle−by−Cycle Current Limit
Output Current up to 400 mA @ VOUT = 3.3 V,
200 mA @ VOUT = 1.8 V
Overvoltage Protection
Low Profile and Minimum External Part
Open Drain Low−Battery Detector Output
Compact Micro10 Package
Pb−Free Package is Available
Typical Applications
Wireless Optical Mouse
Wireless Headsets
Internet Audio Players
Personal Digital Assistants (PDAs)
Hand−held Instruments
Conversion from one/two NiMH or NiCd cells to 1.8 V / 3.3 V
PIN CONNECTIONS
Device
Package
Shipping
ORDERING INFORMATION
NCP1423DMR2
Micro10
4000 Tape & Reel
http://onsemi.com
MARKING
DIAGRAM
DAR
= Device Code
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Top View)
Micro10
DM SUFFIX
CASE 846B
EN
LBO
REF
FB
OUT
LBI
ADEN
BAT
GND
LX
1
2
3
4
5
10
9
8
7
6
Micro10
†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.
DAR
AYW
G
G
NCP1423DMR2G
Micro10
(Pb−Free)
4000 Tape & Reel
(Note: Microdot may be in either location)


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