A8230A

AiT Semiconductor Inc. www.ait-ic.com A8230A ULTRA LOW-DROPOUT CONSTANT-CURRENT WITHOUT WHITE LED BIAS DESCRIPTION The A8230A 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. 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 A8230A is suitable for single cell Li-ion bat-tery 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. The A8230A is available in SOT-26 package. FEATURES  Ultra Low 200mV 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 6V Supply Voltage Range  Thermal shutdown function  Under-voltage protection function  Available in SOT-26 Package APPLICATION  Mobile Phones  White LED backlighting  Camera Flash LED Lighting TYPICAL APPLICATION ORDERING INFORMATION Package Type Part Number SOT-26 A8230AE6R E6 A8230AE6VR Note R: Tape & Reel V: Green Package AiT provides all Pb free products Suffix “ v “ means Green Package Figure ...