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AP5724 Datasheet(PDF) 1 Page - Diodes Incorporated |
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AP5724 Datasheet(HTML) 1 Page - Diodes Incorporated |
1 / 17 page AP5724 WHITE LED STEP-UP CONVERTER AP5724 Document number: DS31843 Rev. 3 - 2 1 of 17 www.diodes.com July 2010 © Diodes Incorporated Description The AP5724 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive 2 ~ 6 LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminates the need for ballast resistors. For driving higher number of LEDs, AP5724 also supports a single feedback of parallel connected multiple strings of equal number of LEDs. The AP5724 switches at 1.2MHz that allows the use of tiny external components. A low 0.1V feedback voltage minimizes power loss in the current setting resistor for better efficiency. Pin Assignments 1 2 3 74 6 OVP FB 5 EN SW (Top View) VIN GND SOT26 / TSOT23-6 SW VIN OVP 1 2 3 6 5 4 GND FB EN (Top View) DFN2020C-6 Features • High efficiency: 84% typical • Fast 1.2MHz switching frequency • Current limit and UVLO protections • Internal thermal shutdown • Internal Over Voltage Protection • Integrated soft-start function • SOT26, TSOT23-6 and DFN2020C-6: Available in “Green” Molding Compound (No Br, Sb) • Lead Free Finish/ RoHS Compliant (Note 1) Applications • Cellular Phones • PDAs, Hand held Computers • Digital Cameras • MP3 Players • GPS Receivers Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit V IN SW EN GND FB AP5724 C OUT 1uF RSET 5 L1 22uH D1 V IN CIN 1uF OVP 2~6 LEDs PWM Dimming OFF ON Figure 1. Typical Application Circuit |
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