EUP2584 Datasheet | Eutech Microelectronics

White LED Step-Up Converter In Tiny SOT-23 Package DESCRIPTION The EUP2584 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 EUP2584 switches at 1.1MHz, allowing the use of tiny external ponents. 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. EUP2584 is enhanced with Soft-Start function and that could significantly reduce noise induced by capacitor. The EUP2584 is available in low profile SOT23-6 package. Features z z z z z z z z z z 2.6V to 5.5V Input Range 27V Output with Over Voltage Protection High Efficiency :85 % Typical Internal Soft-Start PWM Dimming Control Internal High Power 30V MOSFET Switch Fast 1.1MHz Switching Frequency Small, Low-Profile Inductors and Capacitors SOT23-6 Package Ro HS pliant and 100% Lead (Pb)-Free APPLICATIONS z z z z z Mobile Phone Digital Still Camera PDAs, Handheld puters MP3 Players GPS Receivers VÛm w`R - yÑb € Typical Application Circuit ww w.g ofot ech. Figure 1. White LED Application DS2584 Ver1.1 Mar. 2008 N~- NãtÿmñW3^VÛmw`R- yÑb€g- PQl Sø Tel: 0755-8398 3377 / 135 9011 2223 http://.gofotech. Pin Configurations Package Type Pin Configurations SOT23-6 Pin Description PIN LX GND FB EN IN OUT SOT23-6 1 2 3 4 6 5 DESCRIPTION Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. mon Ground Feedback Pin. Reference voltage is 0.25V. Connect cathode of lowest LED and resistor here. Calculate resistor value according to the formula: RFB=0.25/ILED Chip Enable Pin. Connect to 1.4V or higher to enable device, 0.3V or less to disable device. Input Supply Voltage Overvoltage Sense. When VOUT is greater than 27V, the...