The RT9365 is a high performance white LED driver. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by utilizing an x1/x1.5 fractional charge pump and low dropout current sources. The small equivalent x1 mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of x1 mode and optimize the efficiency of Li-ion battery in white LED applications.

The RT9365 supports up to 5 white LEDs and regulates a constant current for uniform intensity. The part implements a 4-bit DAC for brightness control. Users can easily configure the LED current from 1.25mA to 20mA by a serial pulse. 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 operating voltage range is 2.8V to 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.

RT9365 is available in a WQFN 3x3-16L package.


  • Mobile Phone, DSC, MP3
  • White LED Backlighting
  • LCD Display Supply
Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 5
SW Freq (typ) (kHz) 250
Number of LEDs (max) (pcs) 5
Iout (max)/channel (mA) 20
Iq (typ) (mA) 1
Dimming Control Pulse
Features Enable Input;OVP
Package Type WQFN3x3-16
  • 85% Average Efficiency Over Battery Life
  • Support up to 5 White LEDs
  • 80mV Typical Current Source Dropout
  • Support up to 100mA Output Current
  • 1% Typical LED Current Accuracy
  • 0.7% Typical LED Current Matching
  • Soft Start Function
  • Auto Charge Pump Mode Selection
  • 250kHz Fixed Frequency Oscillator
  • Output Over Voltage Protection
  • 16-Step Brightness Control
  • Low Input Noise and EMI
  • Low 0.3μA Shutdown Current
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateDownload
100mA 5-Channel Charge Pump White LED Driver with Low Dropout Current Source2015/11/10
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9365GQWWQFN3x3-161500 Request Buy from Distributor