RT9271

RT9271 White LED Step-Up Converter in Tiny Package General Description The RT9271 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive one to three 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 RT9271 switches at 1.1 MHz, allowing the use of tiny external components. The input and output capacitor can be as small as 1uF, saving space and cost versus alternative solutions. A low 0.25V feedback voltage minimizes power loss in the current setting resistor for better efficiency. The RT9271 is available in low profile SOT-26 package. Ordering Information RT9271 Package Type B : SOT-25 E : SOT-26 Operating Temperature Range C : Commercial Standard P : Pb Free with Commercial Standard Marking Information For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail. Features Inherently Matched LED Current High Efficiency: 85% Typical Drives Up to Three LEDs from 2.8V Supply 20V Internal Switch Fast 1.1 MHz Switching Frequency Uses Tiny 1 mm Height Inductors Requires Only 1uF Output Capacitor Low Profile SOT-26 Package Optional 15V Over Voltage Protection Applications Mobile Phone Digital Still Camera PDAs, Handheld Computers MP3 Players GPS Receivers Pin Configurations (TOP VIEW) LX 1 ...