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AP3019 Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited |
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AP3019 Datasheet(HTML) 1 Page - BCD Semiconductor Manufacturing Limited |
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1 / 15 page  WHITE LED STEP-UP CONVERTER AP3019 Preliminary Datasheet 1 Apr. 2007 Rev. 1. 1 BCD Semiconductor Manufacturing Limited General Description The AP3019 is an inductor-based DC/DC converter designed to drive up to five white LEDs in series for backlight. Only one feedback resistor is needed to con- trol the LED current and obtain satisfied brightness. A constant frequency 1.0MHz PWM control scheme is employed in this IC, which means the tiny external components can be used. In fact, 1mm tall inductor and 0.22µF output capacitor for the typical application is very appropriate. Additionally, the schottky diode in boost circuit is integrated in this chip. AP3019 also provides a disable port to ease its use for different sys- tems. The over output voltage protection is equipped in AP3019. When any LED is broken or in other abnor- mal conditions, the output voltage will be clamped to 27V. The AP3019 is available in standard SOT-23-6 pack- age. Features · Inherently Uniform LED Current · High Efficiency up to 84% · No Need for Extra Schottky Diode · Over Output Voltage Protection · Drives 2 to 5 LEDs · Fast 1.0MHz 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 Figure 1. Package Type of AP3019 SOT-23-6 |
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