EUP2538
10X2 Strings WLED Boost Converter
DESCRIPTION
The EUP2538 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 EUP2538 switches at 1MHz,
allowing the use of tiny external components. The
output capacitor can be as small as 0.47µF, 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
EUP2538 high-voltage output stage is perfect for
driving mid-size and large panel displays containing
up to ten white LEDs in series. The 1.2A current limit
and 0.65Ω R
DSON
allows the part using for up to 10
×
2
string WLED lighting. 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 EUP2538 is available in low profile 8pin 3mm
×
3mm TDFN package.
FEATURES
2.6V to 5.5V Input Range
38V Output with Over Voltage Protection
Internal Soft-Start
PWM Dimming Control
Internal High Power 40V MOSFET Switch
Fast 1MHz Switching Frequency
Using Low-Profile Inductors and Capacitors
Available in 3mm
×
3mm TDFN-8 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
GPS Navigation Systems
Portable Media Players
Handheld Devices, Digital Camera
Portable Game Machines
Typical Application Circuit
Figure 1. White LED Application
DS2538
Ver1.3
Nov. 2008
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
