EUP2539 Datasheet, PDF (1/11 Pages) Eutech Microelectronics Inc – 10 White LED Boost Converter In Thin TSOT-23 Package

EUP2539
10 White LED Boost Converter
In Thin TSOT-23 Package
DESCRIPTION
The EUP2539 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 EUP2539 switches at 1MHz,
allowing the use of tiny external components. The
output capacitor can be as small as 0.22µF, saving
space and cost versus alternative solutions. A low
0.3V feedback voltage minimizes power loss in the
current setting resistor for better efficiency. The
EUP2539 high-voltage output stage is perfect for
driving mid-size and large panel displays containing
up to ten white LEDs in series. LED dimming can be
done by using a DC voltage, a logic signal, or a pulse
width modulation(PWM) signal. The enable input pin
allows the device to be placed in shutdown mode with
“zero” quiescent current.
The EUP2539 is available in low profile TSOT23-5
package.
FEATURES
z 2.6V to 5.5V Input Range
z 38V Output Over Voltage Protection
z Internal Soft-Start
z PWM Dimming Control
z Internal High Power 40V MOSFET Switch
z Fast 1MHz Switching Frequency
z Small, Low-Profile Inductors and Capacitors
z TSOT23-5 Package
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z GPS Navigation Systems
z Portable Media Players
z Handheld Devices, Digital Camera
z Portable Game Machines
Typical Application Circuit
DS2539 Ver1.1 Apr. 2009
Figure 1. White LED Application
1