The CP2126 is a step-up DC/DC converter specifically designed to drive white LEDs with constant current. The device can drive two, three or four white LEDs in series from a Li-Ion cell. Series connection of LEDs provides equal LED current which results in uniform brightness. The CP2126 switches at 900KHz, allowing the use of tiny components. The external capacitor can be as small as 0.22¦ÌF, which saves space and cost compared with alternative solutions. A low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.
FEATURES
• Inherently Matched LED Current
• High Efficiency: 85% Typical
• Drives Up to Four LEDs from a 3.2V Supply
• Stable 20V Bipolar Switch
• Fast 900K Hz Switching Frequency
• Uses tiny inductors of 1mm height
• Requires Only 0.22¦ÌF Output Capacitor
• SOT23-5L Package
APPLICATIONS
• Cellular phones
• Digital Camera
• MP3 Player
• PDA, Notebook
• GPS Receiver
