AP5724

Pb AP5724 WHITE LED STEP-UP CONVERTER Description Pin Assignments 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 (Top View) LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and SW 1 6 VIN eliminates the need for ballast resistors. For driving higher number of LEDs, AP5724 also supports a single feedback of parallel connected GND 2 5 OVP multiple strings of equal number of LEDs. The AP5724 switches at 1.2MHz that allows the use of tiny external FB 3 74 EN components. A low 0.1V feedback voltage minimizes power loss in the current setting resistor for better efficiency SOT26 / TSOT23-6 Features (Top View) High Efficiency: 84% Typical SW 1 6 GND Fast 1.2MHz Switching Frequency Current Limit and UVLO Protections VIN 2 5 FB Internal Thermal Shutdown Internal Over Voltage Protection Integrated Soft-Start Function OVP 3 4 EN U-DFN2020-6 SOT26, TSOT26 and U-DFN2020-6: Available in “Green” Molding Compound (No Br, Sb) Lead-Free Finish; RoHS Compliant (Notes 1 & 2)  Applications Cellular Phones PDAs, Hand held Computers Digital Cameras MP3 Players GPS Receivers Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes In...