EUP2518
White LED Step-Up Converter
In TSOT-23 Package
DESCRIPTION
The EUP2518 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 EUP2518 switches at 1.1MHz,
allowing the use of tiny external components. The
output capacitor can be as small as 0.22uF, saving
space and cost versus alternative solutions. A low
104mV feedback voltage minimizes power loss in the
current setting resistor for better efficiency. EUP2518
is enhanced with Soft-Start function and that could
significantly reduce noise induced by capacitor.
The EUP2518 is available in low profile TSOT23-6
package.
FEATURES
2.6V to 5.5V Input Range
27V Output with Over Voltage Protection
High Efficiency :87 % Typical
Internal Soft-Start
PWM Dimming Control
Internal High Power 30V MOSFET Switch
Fast 1.1MHz Switching Frequency
Small, Low-Profile Inductors and Capacitors
TSOT23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Mobile Phone
Digital Still Camera
PDAs, Handheld Computers
MP3 Players
GPS Receivers
Typical Application Circuit
Figure 1. White LED Application
DS2518 Ver1.0 Mar. 2008
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
