EUP2561

26V Step-Up Converters EUP2561 for Two to Six White LEDs DESCRIPTION The EUP2561 is a constant current step-up converter specially designed for driving white LEDs. The step-up converter topology allows series connection of the white LEDs so the LED currents are identical for uniform brightness. The EUP2561 can drive 6 LEDs in series. The brightness of the LEDs can be adjusted through a voltage level on the CTRL pin or by applying a PWM signal to CRTL pin. 1MHz current-mode, pulse-width modulated (PWM) operation allows for small input and output capacitors www.DataSheet4U.com and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup. The EUP2561 is available in a space-saving, 8-pin 3mm x 3mm DFN package. FEATURES z z z z z z z z z z 2.6V to 5.5V Input Range 26V (max) Output with Overvoltage Protection Up to 87% Efficiency Flexible Analog or PWM Dimming Control Internal High Power 30V MOSFET Switch < 1µA shutdown Current Fast 1MHz PWM Operation Small, Low-Profile Inductors and Capacitors 3mm × 3mm DFN-8 Package RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS z z z z Cell Phones and Smart Phones PDAs, Palmtops, and Wireless Handhelds e-Books and Subnotebooks White LED Display Backlighting Typical Application Circuit Figure 1. White LED Application DS2561 Ver1.0 Dec. 2006 1 EUP2561 Pin Configurations Package Type Pin Configurations (Top View) DFN-8 www.DataSheet4U.com Pin Description ...