FEATURES
s s s s s s s s s DESCRIPTIO Inherently Matched LED Current High Efficiency: 84% Typical Drives Up to Four LEDs from a 3.2V Supply Drives Up to Six LEDs from a 5V Supply 36V Rugged Bipolar Switch Fast 1.2MHz Switching Frequency Uses Tiny 1mm Tall Inductors Requires Only 0.22µF Output Capacitor Low Profile SC70 and ThinSOTTM Packaging U APPLICATIO S s s s s s The LT ®1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. A low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. Cellular Phones PDAs, Handheld Computers Digital Cameras MP3 Players G...
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