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-lon 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 exteral components. The output capacitor
can be as small as 1μF, saving space and cost
versus altermative 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.

Inherently Matched LED Current.
High Eficiency: 85% Typical.
Drives Up to Four LEDs from a 3.0V Supply.
Drives Up to Six LEDs from a 3.6V Supply.
Fast 1MHz Switching Frequency.
Uses Tiny 1mm Tall Inductors.
Requires only 1μF Output Capacitor.
Low Profile SOT-23-5L Packaging.
Lead (Pb)-Free.

          应用

Cellular Phones
PDAs, Handheld Computuers
Digital Camera
MP3 Players
GPS Receivers