DESCRIPTION
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. The LT1937 switches at 1.2MHz, allowing the use of tiny external components. The output capacitor can be as small as 0.22µF, saving space and cost versus alternative solutions. A low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.
The LT1937 is available in low profile SC70 and ThinSOT packages.

FEATURES
■ 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

APPLICATIONS
■ Cellular Phones
■ PDAs, Handheld Computers
■ Digital Cameras
■ MP3 Players
■ GPS Receivers