5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver


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The RT9385B is a 5 channel WLED driver with auto mode selection of x1, x1.5 and x2 mode with low dropout voltage in current sources. The RT9385B can power up to 5 white LEDs with regulated constant current for uniform intensity. Each channel (LED1 to LED5) can support up to 25mA. The part maintains highest efficiency by utilizing x1/x1.5/x2 fractional charge pump and low dropout current regulators. An internal 5-bit DAC is used for brightness control. Users can easily configure up to 32 steps of LED current by enable pin.
The RT9385B is available in a WQFN-16L 2x3 package. Small 1μF capacitors can be used for fly capacitors. It provides the best backlighting solution with high efficiency and smallest board space for portable application.


Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 4.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 5
Iout (max)/channel (mA) 25
Iq (typ) (mA) 1
Dimming Control Pulse
Topology Charge Pump
Features Enable Input;OVP
Package Type WQFN2x3-16
  • 85% Average Efficiency Over Li-ion Battery Discharge
  • Support Up to 5 White LEDs
  • Support Up to 25mA/Per Channel
  • Support Up to 125mA Output Current
  • Flexible 32 Step Brightness Control
  • 60mV Current Source Dropout
  • 1% LED Current Accuracy
  • 0.7% 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 Inrush Protection
  • 1MHz Frequency Oscillator
  • 0.4μA Low Shutdown Current
  • RoHS Compliant and Halogen Free
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5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver2008/12/12
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9385BGQWWQFN2x3-161500 Not available Buy from Distributor