Diodes Incorporated

AP3009 (Not Recommended for new design)

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The AP3009 is an inductor-based DC/DC converter designed to drive up to six white °Cs in series for backlight. Only one feedback resistor is needed to control the °C current and obtain satisfied brightness. A constant frequency 1.2MHz PWM control scheme is employed in this IC, which means the tiny external components can be used. In fact, 1mm tall inductor and 0.22mF output capacitor for the typical application is very appropriate. Additionally, the schottky diode in boost circuit is integrated in this chip. AP3009 also provide a disable port to ease its use for different systems. The over output voltage protection is equipped in AP3009. When any °C is broken or in other abnormal conditions, the output voltage will be clamped to 30V.


· Inherently Uniform °C Current · High Efficiency: 83% Typical · No Need for Extra Schottky Diode · Over Output Voltage Protection · Drives 2 to 6 °Cs · Fast 1.2MHz Switching Frequency · Uses Tiny 1mm Tall Inductor · Requires Only 0.22mF Output Capacitor


· Cellular Phones · Digital Cameras · LCD modules · GPS Receivers · PDAs, Handheld Computers

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