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AP5726WUG-7 Datasheet(PDF) 1 Page - Diodes Incorporated |
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AP5726WUG-7 Datasheet(HTML) 1 Page - Diodes Incorporated |
1 / 17 page AP5726 WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 1 of 17 www.diodes.com July 2010 © Diodes Incorporated Description The AP5726 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, AP5726 also supports a single feedback of parallel connected multiple strings of equal number of LEDs. The AP5726 switches at 1.2MHz that allows the use of tiny external components. A low 0.31V 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 help 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 AP5726 C OUT 1uF RSET 15 L1 22uH D1 V IN C IN 1uF OVP 2~6 LEDs PWM Dimming OFF ON Figure 1. Typical Application Circuit |
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