SP1937 DC-DC Step-Up Converter for White LED DESCRIPTION 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.
APPLICATIONS • Battery Power Equipment • Notebook Computers • PDA • Cellular Phone • Digital Cameras • MP3 Players • ...

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