RT9368A

RT9368A 4-Channel Charge Pump White LED Driver with Low Dropout Current Source General Description The RT9368A is a high efficiency and cost effective charge pump white LED driver. It supports up to 4 white LEDs with regulated constant current for uniform intensity. The RT9368A maintains the highest efficiency by utilizing a x1/x1.5/x2 charge pump and low dropout current regulators. User can easily configure each LED current from 1.25mA to 20mA by a pulse dimming control. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN pin. There are totally 16 steps of current could be set by users. RT9368A is available in a WQFN3x3-16L package. Features z z z z z z z z z z z Very High Efficiency Over 80% of Battery Life Support up to 4 White LEDs Support up to 80mA Output Current 1% Typical LED Current Matching Soft Start Function Auto Charge Pump Mode Selection 250kHz Fixed Frequency Oscillator Output Over Voltage Protection 16 Steps Brightness Control Low Input Noise and EMI RoHS Compliant and 100% Lead (Pb)-Free Applications z z z Ordering Information RT9368A Package Type QW : WQFN-16L 3x3 (W-Type) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` Mobile Phone, DSC, MP3 White LED Backlighting LCD Display Supply Pin Configurations (TOP VIEW) LED3 LED2 LED1 VIN 12 EN 11 NC 17 5 6 7 8 10 GND 9 16 15 14 13 RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitab...