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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.
Efficiency Up to 93% Over Li-ion Battery Discharge
Typical 85% Average Efficiency Over Li-ion Battery Discharge
Support Up to 4 White LEDs
Support Up to 25mA/Per Channel
Support Up to 100mA Output Current
PWM Brightness Control
60mV Typical Current Source Dropout
1% Typical LED Current Accuracy
0.7% Typical LED Current Matching
Automatic x1/x1.5/x2 Charge Pump Mode Transition
Low Input Noise and EMI Charge Pump
5V Over Voltage Protection
Power On/Mode Transition In-rush Protection
1MHz Switching Frequency
0.4μA Low Shutdown Current
RoHS Compliant and Halogen Free
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