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AP3019A Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited |
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AP3019A Datasheet(HTML) 1 Page - BCD Semiconductor Manufacturing Limited |
1 / 15 page Data Sheet WHITE LED STEP-UP CONVERTER AP3019A Mar. 2010 Rev. 1.7 BCD Semiconductor Manufacturing Limited 1 General Description The AP3019A is an inductor-based DC/DC converter designed to drive up to eight white LEDs in series for backlight. Only one feedback resistor is needed to control the LED current and obtain required brightness. A constant frequency 1.2MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall inductor and 0.22 µF output capacitor for a typical application is sufficient. Additionally, the Schottky diode in boost circuit is integrated on this chip. AP3019A also provides a disable pin to ease its use for different systems. The output over-voltage protection is implemented in AP3019A. When any LED is broken or in other abnormal conditions, the output voltage will be clamped. The AP3019A is available in standard SOT-23-6 and TSOT-23-6 packages. Features • Inherently Uniform LED Current • High Efficiency up to 84% • No Need for External Schottky Diode • Output Over-voltage Protection (OVP) • Fixed 1.2MHz Switching Frequency • Uses Tiny 1mm Tall Inductor • Requires Only 0.22 µF Output Capacitor Applications • Cellular Phones • Digital Cameras • LCD modules • GPS Receivers • PDAs, Handheld Computers Figure 1. Package Types of AP3019A SOT-23-6 TSOT-23-6 |
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