The LT®1937 is a step-up DC/DC converter specificallydesigned to drive white LEDs with a constant current. Thedevice can drive two, three or four LEDs in series from aLi-Ion cell. Series connection of the LEDs provides identicalLED currents resulting in uniform brightness andeliminating the need for ballast resistors. The LT1937switches at 1.2MHz, allowing the use of tiny externalcomponents. The output capacitor can be as small as0.22mF, saving space and cost versus alternative solutions.A low 95mV feedback voltage minimizes power lossin the current setting resistor for better efficiency.The LT1937 is available in low profile SC70 and ThinSOTpackages.
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