SP1937 Datasheet, PDF (1/10 Pages) SYNC POWER Crop. – DC-DC Step-Up Converter for White LED

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
z Battery Power Equipment
z Notebook Computers
z PDA
z Cellular Phone
z Digital Cameras
z MP3 Players
z GPS Receivers
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
PIN CONFIGURATION
SOT-23-5L
SOT-353 ( SC-70-5L )
PART MARKING
SOT-23-5L
SOT-353 ( SC-70-5L )
2007/07/10 Ver.3
Page 1