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EUP2561JIR1

26V Step-Up Converters for Two to Six White LEDs

Eutech Microelectronics Inc 

EUP2561

26V Step-Up Converters

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

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 2.6V to 5.5V Input Range

z 26V (max) Output with Overvoltage Protection

z Up to 87% Efficiency

z Flexible Analog or PWM Dimming Control

z Internal High Power 30V MOSFET Switch

z < 1µA shutdown Current

z Fast 1MHz PWM Operation

z Small, Low-Profile Inductors and Capacitors

z 3mm × 3mm DFN-8 Package

z RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONS

z Cell Phones and Smart Phones

z PDAs, Palmtops, and Wireless Handhelds

z e-Books and Subnotebooks

z White LED Display Backlighting

Typical Application Circuit

DS2561 Ver1.0 Dec. 2006

Figure 1. White LED Application

1

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