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Eutech Microelectronics

EUP2518 Datasheet Preview

EUP2518 Datasheet

White LED Step-Up Converter

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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
DS2518 Ver1.0 Mar. 2008
Figure 1. White LED Application
1




Eutech Microelectronics

EUP2518 Datasheet Preview

EUP2518 Datasheet

White LED Step-Up Converter

No Preview Available !

Pin Configurations
Package Type
EUP2518Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Pin Configurations
TSOT23-6
Pin Description
PIN
LX
GND
FB
EN
OUT
IN
TSOT23-6
DESCRIPTION
1 Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
2 Common Ground
3
Feedback Pin. Reference voltage is 104mV. Connect cathode of lowest LED and resistor
here. Calculate resistor value according to the formula: RFB=104/ILED
4
Chip Enable Pin. Connect to 1.4V or higher to enable device, 0.3V or less to disable
device.
Overvoltage Sense. When VOUT is greater than 27V, the internal N-channel MOSFET
5 turns off until VOUT drops below 25V, then the IC reenters start. Connect a 0.22uF
capacitor from OUT to GND.
6 Input Supply Voltage
DS2518 Ver1.0 Mar. 2008
2


Part Number EUP2518
Description White LED Step-Up Converter
Maker Eutech Microelectronics
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EUP2518 Datasheet PDF






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