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发布者:微桥 发布时间:2010-1-19 阅读:5508次    关键字: SP1937 LTC1937
SP1937-DC-DC Step-Up Converter for White LED


SP1937-DC-DC Step-Up Converter for White LED DataSheet

DESCRIPTION APPLICATIONS
    The SP1937 is a step-up DC/DC converter for white LED driver with constant current. The device can driver one to four LEDs in series from a single cell Lithium Ion battery. Internal functions include current limiting;thermal shutdown and soft-start to prevent damage operate status. The SP1937 DC/DC converter operates
at 1.2MHz and low output capacitor as small as 0.22uF; apply to Lithium-Ion powered systems. A low 95mV (Typ) reference voltage minimizes power loss in the
current setting resistor for better efficiency.

FEATURES
􀂋 Fast 1.2MHz Switching Frequency
􀂋 High Efficiency up to 85%
􀂋 Drives up to Four LEDs From 3.2V Supply
􀂋 Low Quiescent Current
􀂋 Disconnects LEDs in Shutdown Mode
􀂋 Internal Over Temperature and Current Limiting Shutdown Function
􀂋 36V Rugged Bipolar Switch
􀂋 Small Package SOT-23-5L & SOT-353

APPLICATIONS
􀁺 Battery Power Equipment
􀁺 Notebook Computers
􀁺 PDA
􀁺 Cellular Phone
􀁺 Digital Cameras
􀁺 MP3 Players
􀁺 GPS Receivers

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