RT9378

® RT9378 4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver General Description The RT9378 is a 4 CH WLED driver with auto mode selection of x1, x1.5 and x2 mode with low dropout voltage in current sources. The RT9378 can power up to 4 white LEDs with regulated constant current for uniform intensity. Each channel (LED1 to LED4) can support up to 25mA. The part maintains highest efficiency by utilizing x1/x1.5/ x2 fractional charge pump and low dropout current regulators. For the brightness control, user can easily use a PWM signal generated from GPIO to control the brightness of WLEDs. The RT9378 is available in a WQFN-12L 2x2 package. Small 0.22μF capacitors can be used for fly capacitors. It provides the best backlighting solution with high efficiency and smallest board space for portable application. Ordering Information RT9378 Package Type QW : WQFN-12L 2x2 Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Typical Application Circuit CFLY1 0.22µF CFLY2 0.22µF VIN 2.8V to 4.5V PWM Dimming 3 C1P 5 VIN CIN 1µF 6 EN 2, Exposed pad (13) GND 1 4 12 C1N C2P C2N RT9378 LED1 7 LED2 8 LED3 9 LED4 10 VOUT 11 COUT 1µF Copyright ©2014 Richtek Technology Corporation. All rights reserved. DS9378-04 January 2014 Features z Efficiency Up to 93% Over Li-ion Battery Discharge z Typical 85% Aver...