Diodes Incorporated AP5725

Description

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.

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)

RemarksLA 10μH~22μH inductor is recommended for most AP5725 applications.Refer page no.9

Table 2. Suggested InductorsRefer page no.12

Typical applications

• GPS Receivers
• PDAs, Hand held Computers
• MP3 Players
• Digital Cameras
• Cellular Phones

More information

• Datasheet
• IC product information