The RT9271 is a step-up DC/DC converter specificallydesigned to drive white LEDs with a constant current. Thedevice can drive one to three LEDs in series from a Li-Ioncell. Series connection of the LEDs provides identical LEDcurrents resulting in uniform brightness and eliminatingthe need for ballast resistors. The RT9271 switches at 1.1MHz, allowing the use of tiny external components. Theinput and output capacitor can be as small as 1uF, savingspace and cost versus alternative solutions. A low 0.25Vfeedback voltage minimizes power loss in the currentsetting resistor for better efficiency.The RT9271 is available in low profile SOT-23-6 package.
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