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2007/07/10 Ver.3 Page 1 SP1937 DC-DC Step-Up Converter for White LED 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. Battery Power Equipment Notebook Computers PDA Cellular Phone Digital Cameras MP3 Players GPS Receivers FEATURES PIN CONFIGURATION SOT-23-5L SOT-353 ( SC-70-5L ) PART MARKING SOT-23-5L SOT-353 ( SC-70-5L ) 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 |
