供应致新 G5921P8UF 用于白色LED的低压差恒流偏置电源

　　General Description

　　The G5920/G5921 is a high performance ultra lowdropout 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/G5921 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.

　　Features

　　► 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

　　Applications

　　► Mobile Phones

　　► White LED backlighting