Diodes Incorporated AP5726WG-7

Description
The AP5726 is a step-up DC/DC converter designed to drive white LEDs with a constant current. It 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 eliminating the need for ballast resistors. For driving a higher number of LEDs, the AP5726 also supports a single feedback of parallel-connected multiple strings of an equal number of LEDs.
The AP5726 switches at 1.2MHz, allowing the use of tiny external components. A low 0.31V feedback voltage minimizes power loss in the current setting resistor for better efficiency.

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

Applications
Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers