CP2127

时间: 2008-01-08 18:23:58 来源: 作者: ; 浏览量:

OVERVIEW
The CP2127 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four white LEDs in series from a Li-Ion cell. Series connection of LEDs provides identical LED current resulting in uniform brightness. The CP2127 switches at 1.2MHz ， allowing the use of tiny components. The external capacitor can be as small as 0.22uF, saving space and cost versus 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 • 20V stable bipolar switch • Fast 1.2MHz switching frequency • Uses tiny 1mm tall inductor • Requires only 0.22uF output capacitor • Operating industrial temperature range: -40 ℃ ~ 85 ℃ • SOT23-5L package