SE3506 Datasheet, PDF (1/6 Pages) Seaward Electronics Inc. – White LED Step-Up Converter

Description
The SE3506 is a step-up DC/DC converter
specifically designed to drive white LEDs with a
constant current. The device can drive two, three,
four, or five LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical
LED current resulting in uniform brightness and
eliminating the need for ballast resistors. The
SE3506 switches at 1MHz, allowing the use of any
tiny external components. The output capacitor
can be as small as 1μF, saving space and cost
versus alternative solutions. A low 95mV feedback
voltage minimizes power loss in the current setting
resistor for better efficiency.
SE3506 is available in low profile SOT-23-5L
package.
Features
¾ Inherently Matched LED Current.
¾ High Efficiency: 85% Typical.
¾ Drives Up to Four LEDs from a 3.0V Supply.
¾ Drives Up to Six LEDs from a 3.6V Supply.
¾ Fast 1MHz Switching Frequency.
¾ Uses Tiny 1mm Tall Inductors.
¾ Requires Only 1μF Output Capacitor.
¾ Low Profile SOT-23-5L Packaging.
¾ 100% Lead (Pb)-Free.
Application
¾ Cellular Phones
¾ PDAs, Handheld Computuers
¾ Digital Camera
¾ MP3 Players
¾ GPS Receivers
Ordering/Marking Information
Package
Ordering Information
SOT-23-5L
Marking Information
SE3506-LF
506z ^•
The last character is the
batch number.
Application Diagram
Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 1