深圳市微桥科技有限公司

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