NCP1423 Datasheet, PDF (1/13 Pages) ON Semiconductor – 400 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer

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 @ V_OUT = 3.3 V,
200 mA @ V_OUT = 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
http://onsemi.com
MARKING
DIAGRAM
Micro10
DM SUFFIX
CASE 846B
DAR
AYWG
G
DAR = Device Code
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
EN 1
REF 2
FB ³
GND 4
OUT 5
Micro10
10 LBO
9 LBI
8 ADEN
7 LX
6 BAT
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1423DMR2 Micro10 4000 Tape & Reel
NCP1423DMR2G Micro10 4000 Tape & Reel
(Pb−Free)
†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.
© Semiconductor Components Industries, LLC, 2006
1
October, 2006 − Rev. 5
Publication Order Number:
NCP1423/D