AP5725

AP5725 WHITE LED STEP-UP CONVERTER Description Pin Assignments The AP5725 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, AP5725 also supports a single feedback of parallel connected multiple strings of equal number of LEDs. The AP5725 switches at 1.2MHz that allows the use of tiny external components. A low 0.25V feedback voltage minimizes power loss in the current setting resistor for better efficiency. (Top View) SW 1 6 VIN (Top View) GND 2 FB 3 SW 1 5 OVP VIN 2 74 EN OVP 3 6 GND 5 FB 4 EN SOT26 / TSOT23-6 DFN2020C-6 Features Applications High efficiency: 84% typical Fast 1.2MHz switching frequency Current limit and UVLO protections Internal thermal shutdown Internal ...