EUP2595 Datasheet | Eutech Microelectronics

32V Step-Up Converters for Two to Nine White LEDs DESCRIPTION The EUP2595 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 EUP2595 can drive 9 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 and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup. The EUP2595 is available in a space-saving, 8-pin 3mm x 3mm TDFN package. Features z z z z z z z z z z 2.6V to 5.5V Input Range 32V (max) Output with Overvoltage Protection Up to 90% Efficiency Flexible Analog or PWM Dimming Control Internal High Power MOSFET Switch < 1µA shutdown Current Fast 1MHz PWM Operation Small, Low-Profile Inductors and Capacitors 3mm × 3mm TDFN-8 Package Ro HS pliant 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 VÛm w`R - yÑb € ww w.g ofot ech. Figure 1. Typical Application Circuit DS2595 Ver1.1 Aug. 2008 N~- NãtÿmñW3^VÛmw`R- yÑb€g- PQl Sø Tel: 0755-8398 3377 / 135 9011 2223 http://.gofotech. Pin Configurations Package Type Pin Configurations TDFN-8 Pin Description PIN OUT IN CTRL CS P GND PGND LX Pin 1 2 3 4 5 6 7 8 DESCRIPTION WLED output overvoltage sense pin. Add a 1kΩ resistor to improve overvoltage sense accuracy. Input Supply Voltage. Brightness Control Input. LED brightness is controlled by the voltage applied to CTRL. Varying the voltage from 0.24V to 1.65V adjusts the brightness from dim to bright, respectively. Any voltage above 1.65V does not increase...