General Description
The AP3009 is an inductor-based DC/DC converter designed to drive up to six white LEDs in series for backlight. Only one feedback resistor is needed to control the LED current and obtain satisfied brightness.
   
Features
• Inherently Uniform LED Current
• High Efficiency: 83% Typical
• No Need for Extra Schottky Diode
• Over Output Voltage Protection
• Drives 2 to 6 LEDs
• Fast 1.2MHz Switching Frequency
• Uses Tiny 1mm Tall Inductor
• Requires Only 0.22µF Output Capacitor
   
Applications
• Cellular Phones
• Digital Cameras
• LCD modules
• GPS Receivers
• PDAs, Handheld Computers