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
|