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4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver

RT9378

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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.

Applications

Key Spec.
RT9378
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 4.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 4
Iout (max)/channel (mA) 25
Iq (typ) (mA) 1
Dimming Control PWM
Features Enable Input;OVP
Package Type WQFN2x2-12
Features
  • 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
Datasheet
TitleLast UpdateShareDownload
4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver2009/01/05
Reliability
Title Last Update ShareDownload
4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver 2015/05/19
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