EUP2571

EUP2571 White LED Step-Up Converter In Tiny SOT-23 Package DESCRIPTION The EUP2571 is a constant current step-up converter specifically designed to drive white LEDs. The Step-up converter topology allows series connection of the white LEDs so the LED currents are identical for uniform brightness. The EUP2571 switches at 1.1MHz, allowing the use of tiny external components. The input and output capacitor can be as small as 1µF, saving space and cost versus alternative solutions. A low 0.25V feedback voltage minimizes power loss in the current setting resistor for better efficiency. www.DataSheet4U.com The EUP2571 is available in low profile SOT23-5, SOT23-6 package. FEATURES z z z z z z z z z 2.6V to 5.5V Input Range 26V Output with Over Voltage Protection High Efficiency :85 % Typical PWM Dimming Control Internal High Power 30V MOSFET Switch Fast 1.1MHz Switching Frequency Small, Low-Profile Inductors and Capacitors SOT23-5,SOT23-6 Package RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS z z z z z Mobile Phone Digital Still Camera PDAs, Handheld Computers MP3 Players GPS Receivers Typical Application Circuit Figure 1. White LED Application DS2571 Ver1.1 May. 2007 1 EUP2571 Typical Application Circuit (continued) www.DataSheet4U.com Figure 2. 5V to 9V/300mA Step-Up Application Pin Configurations Package Type Pin Configurations Package Type Pin Configurations SOT23-5 SOT23-6 Pin Description PIN LX GND FB EN IN OUT SOT23-5 1 2 3 4 5 SOT23-6 1 2 3 4 6 5 DESCRIPTIO...