EUP2584/EUP2584VIR1(驱动IC

White LED Step-Up Converter
In Tiny SOT-23 Package
D*CRIPTION
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 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.
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 and
TSOT23-5 packages.
T*ical Application Circuit
FEATUR*
z 2.6V to 5.5V Input Range
z 27V Output with Over Voltage Protection
z High Efficiency :85 % T*ical
z Internal Soft-Start
z PWM Dimming Control
z Internal High Power 30V MOSFET Switch
z Fast 1.1MHz Switching Frequency
z Small, Low-Profile Inductors and Capacitors
z SOT23-6 and TSOT23-5 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z Mobile Phone
z Di*al Still Camera
z PDAs, Handheld Computers
z MP3 Players
z GPS Receivers
Figure 1. White LED Application