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NCP1423ONN/a40avaiBoost Converter, Sync-Rect, PFM, DC-DC, 400 mA, with True-Cutoff and Ring-Killer


NCP1423 ,Boost Converter, Sync-Rect, PFM, DC-DC, 400 mA, with True-Cutoff and Ring-KillerFeaturesW = Work Week = Pb−Free Package• High Efficiency: 92% for 3.3 V Output@ 400 mA from 2.5 V ..
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NCP1423
Boost Converter, Sync-Rect, PFM, DC-DC, 400 mA, 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 �A. 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 �A Low Battery Detector 0.8 V Startup External Adjustable Output V oltage ±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
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