Description

The SC4509 is a highly integrated step-up DC/DC converter targeted for white LED backlighting applications. It is designed to drive up to five LEDs with a wide input voltage range of 2.7 to 10 volts. Designed for 20V output voltage, the SC4509 operates with a constant 1.2MHz PWM frequency.

Features

VINrange: 2.7V — 10V

Integrated Schottky diode

81% efficiency

Requires only 4 external components

Up to 20V of output voltage

30mA maximum LED current

Open LED protection (OVP)

1.2MHz PWM switching frequency

Low feedback voltage (20OmV typical)

Wide range of PWM dimming

Drives up to 5 LEDs

500mA switch current limit

220nF output capacitor

Available in 2mm x 2mm x 0.75mm MLPD-W8 and SOT23-6 packages

Packages are fully WEEE and RoHS compliant

Applications

Digital Video Cameras

White LED Backlight Driver

OLED Display Driver

Portable Media Players

GPS Receivers

Cellular Phones

PDAs and Handheld Computers