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NCP1421DMR2GONN/a1800avai600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer


NCP1421DMR2G ,600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-KillerELECTRICAL CHARACTERISTICS (V = 3.3 V, T = 25°C for typical value, −40°C  T  85°C for min/max val ..
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NCP1421DMR2G
600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer
NCP1421
600 mA Sync-Rect PFM
Step-Up DC-DC Converter
with True-Cutoff and
Ring-Killer
NCP1421 is a monolithic micropower high−frequency step−up
switching converter IC specially designed for battery−operated
hand−held electronic products up to 600 mA loading. It integrates
Sync−Rect to improve efficiency and to eliminate the external
Schottky Diode. High switching frequency (up to 1.2 MHz) allows
for a low profile, small−sized inductor and output capacitor to be
used. When the device is disabled, the internal conduction path from
LX or BA T to OUT is fully blocked and the OUT pin is isolated from
the battery. This True−Cutoff function reduces the shutdown current
to typically only 50 nA. Ring−Killer is also integrated to eliminate
the high−frequency ringing in discontinuous conduction mode. In
addition to the above, Low−Battery Detector, Logic−Controlled
Shutdown, Cycle−by−Cycle Current Limit and Thermal Shutdown
provide value−added features for various battery−operated
applications. With all these functions on, the quiescent supply
current is typically only 8.5 �A. This device is available in the
compact and low profile Micro8� package.
Features
Pb−Free Package is Available High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input
88% for 3.3 V Output at 500 mA from 2.5 V Input High Switching Frequency, up to 1.2 MHz (not hitting current limit) Output Current up to 600 mA at VIN = 2.5 V and VOUT = 3.3 V True−Cutoff Function Reduces Device Shutdown Current to
typically 50 nA Anti−Ringing Ring−Killer for Discontinuous Conduction Mode High Accuracy Reference Output, 1.20 V �1.5%, can Supply
2.5 mA Loading Current when VOUT > 3.3 V Low Quiescent Current of 8.5 �A Integrated Low−Battery Detector Open Drain Low−Battery Detector Output 1.0 V Startup at No Load Guaranteed Output Voltage from 1.5 V to 5.0 V Adjustable 1.5 A Cycle−by−Cycle Current Limit Multi−function Logic−Controlled Shutdown Pin On Chip Thermal Shutdown with Hysteresis
Typical Applications
Personal Digital Assistants (PDA) Handheld Digital Audio Products Camcorders and Digital Still Cameras Hand−held Instruments Conversion from one to two Alkaline, NiMH, NiCd Battery Cells to
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