3 Channels 90mA x1/x2 Charge Pump White LED Driver


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The RT9363A is a compact, high efficient and highly integrated charge pump white LED driver. It maintains the highest efficiency by utilizing a x1/x2 fractional charge pump and low dropout current regulators. The RT9363A supports up to 3 white LEDs and regulates a constant current for uniform intensity. The part implements a 4-bit DAC for brightness control. Users can select external RSET or internal RSET by ISET pin. 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. The part can support 15mA to 30mA for the 100% current setting. Users also can use the internal RSET for 100% current setting of 20mA just by connecting the ISET pin to VIN. The operating voltage range is from 2.8V to 5.5V. Internal soft start circuitry effectively reduces the in-rush current while both start-up and mode transition. The load is disconnected from VIN while shutdown and the shutdown current is less than 1μA.
RT9363A is available in a WDFN -10L 3x3 package.


  • Mobile Phone, DSC, MP3
  • White LED Backlighting
  • LCD Display Supply
Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 5.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 3
Iout (max)/channel (mA) 20
Iq (typ) (mA) 1;3
Dimming Control Pulse
Topology Charge Pump
Features Enable Input;OVP;Stable with Ceramic Capacitor;UVP
Package Type WDFN3x3-10
  • Over 80% Average Efficiency Over Battery Life
  • Support Up to 3 White LEDs
  • 80mV Typical Current Source Dropout
  • Support Up to 90mA Output Current
  • 1% Typical LED Current Accuracy
  • 0.7% Typical LED Current Matching
  • Soft Start Function
  • Automatic Charge Pump Mode Selection
  • 1MHz Random Frequency Oscillator
  • Over Voltage Protection
  • 16-Step Brightness Control
  • Low Input Noise and EMI
  • Low 1μA Shutdown Current
  • Flexible Current Setting
  • RoHS Compliant and 100% Lead (Pb)-Free
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3 Channels 90mA x1/x2 Charge Pump White LED Driver2015/04/29
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3 Channels 90mA x1/x2 Charge Pump White LED Driver 2015/05/19