ZMDI ZLED7022六路低噪音LED驱动方案

ZMDI公司的ZLED7022是六路低噪音恒定频率电荷泵DC/DC转换器,可驱动六路LED,每路LED的电流从1.8mA到20mA可编程,并联工作时可驱动更大电流的LED, 工作电压2.8V-5.5V,关断模式电流小于2uA,主要用在手提设备的LED背光,手机,智能手机和PDA的LED照明,数码相框照明等.本文介绍了ZLED7022主要特性和`优势,方框图以及典型应用电路.

The ZLED7022, one of our ZLED family of LED control ICs, is a low-noise, constant-frequency charge pump DC/DC converter that can drive up to six LED channels, providing a programmable constant current level ranging from 1.8mA to 20mA per LED channel. It can also drive higher current LEDs because its current sinks can operate in parallel. It enables white or other color LED applications that require uniform intensity and/or linear progressions in brightness. Capable of operating efficiently with DC voltage supplies ranging from 2.8V to 5.5V, it is ideal for small, battery-powered applications because very few external components are needed: typically one small-dimension 1μF capacitor across the C+ and C- pins and two small-dimension 2.2μF capaci-tors to GND from the VCC and Vout pins.
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