Description

The YB1508 is a step-up DC-DC converter, acting as current source to drive up to 8 white LEDs in series. Series connecting of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The light intensity of these LEDs is proportional to the current passing through them. Additional features include output over voltage protection to prevent device damage due to faulty LED or open circuit caused by abnormal conditions, and one-pin shutdown and multiple methods of dimming control.

Features

■ 2.7V to 9V input range

■ Adjustable output voltage up to 40V

■ Built in internal switch

■ Inherently matched LED current

■ Fixed frequency of 1MHz PWM operation

■ Open LED protection

■ Low profile 5-Lead SOT-23 package

■ High efficiency: over 80% at 3.6V input voltage

■ Drives up to 8 white LEDs

Applications

■ LCD Display Module

■ OLED panel/sub-panel

■ White LED Backlighting

■ Digital Camera

■ Cellular Phone

■ Portable Application