RT9368

RT9368 4-Channel Charge Pump White LED Driver with Low Dropout Current Source General Description The RT9368 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 RT9368 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 PWM dimming control. The dimming of white LEDs current can be achieved by applying a PWM signal to the EN pin. RT9368 is available in a WQFN 3x3-16L 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 PWM Dimming Control Low Input Noise and EMI RoHS Compliant and 100% Lead (Pb)-Free Ordering Information RT9368 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 : ` Applications z z z Mobile Phone, DSC, MP3 White LED Backlighting LCD Display Supply Pin Configurations (TOP VIEW) LED3 LED2 LED1 VIN 12 EN 11 ISET 17 5 6 7 8 10 GND 9 RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. LED4 NC GND 1 2 3 4 16 15 14 13 ` ...