LN5121产品概述
G5920在20mA时仅需150mV的低压差;【G5920】0.6%的高精度电流控制;【G5920】32级线性电流背光控制;【G5920】SOT-23-6封装 ；G5920是一款用于LED驱动的高性能、超低压差、恒定电流的电流偏置器，主要应用于由电池供电直接驱动白光LED的场合，提供了一种简单的并联型白光LED驱动方案。G5920能在2.5v～6v的电压范围内提供稳定的三路20mA电流输入，无需外接电容电感电阻，无噪声，体积小。G5920除了提供常用的PWM调节辉度的亮度调节方式外，还同时提供单线串口模式，实现32级恒定亮度可调。G5920适用于单节锂电池供电，采用低正向电压的白光LED的应用场合，也可以作为恒定电流偏置源使用。G5920由于驱动LED的方案无需外接元件，也没有EMI的问题，体积小巧，成本也更低，相比开关电源和电荷泵来讲，具有很大优势。

G5920产品主要特性
·Ultra Low 150mV Dropout at 20mA
·0.6% High Accuracy Current Matching
·20mA Full Scale Current
·32 Level Linear Current Brightness Control
·PWM Brightness Control
·2.5V to 5.5V Supply Voltage Range
·SOT-23-6 and TSOT-23-6 Package

G5920产品应用领域
·Mobile Phones
·White LED backlighting

G5920产品简介
The G5920 is a high performance ultra low- dropout constant current bias supply for white LEDs. It can be used as an alternative to the simple ballast resistors in conventional parallel white LEDs applications. Each white LED bias current is matching to 0.6%. For dimming control, an enable input pin is controlled by processor GPIO output pulses for 32 level linear current. Using a low frequency PWM waveform to this enable input pin also controls the average LED current which is proportional to the PWM duty. The G5920 is suitable for single cell Li-ion battery power device that using low forward voltage white LEDs. The white LEDs can be powered directly from battery without extra external components. This takes an advantage of highest efficiency and creates no EMI problem.
 

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