Diodes Incorporated AP5724

Description

The AP5724 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive 2 ~ 6LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness andeliminates the need for ballast resistors. For driving higher number of LEDs, AP5724 also supports a single feedback of parallel connected multiple strings of equal number of LEDs.The AP5724 switches at 1.2MHz that allows the use of tiny external components. A low 0.1V feedback voltage minimizes power loss inthe 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, TSOT26 and U-DFN2020-6: Available in “Green”Molding Compound (No Br, Sb)
• Lead-Free Finish; RoHS Compliant (Notes 1 & 2)

Remarks:A 10μH to 22μH inductor is recommended for most AP5724 applications.Refer page no.8

Table 2. Suggested InductorsRefer page no.10

Typical applications

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

More information

• Datasheet
• IC product information