Tiny Package, High Performance, Diode Embedded White LED Driver


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The RT9285B is a high frequency asynchronous boost converter with internal diode, which can support 2 to 5 White LEDs for backlighting and OLED power supply. The Internal soft start function can reduce the inrush current. The device operates with 1MHz fixed switching frequency to allow small external components and to simplify possible EMI problems. The device comes with 20V over voltage protection to allow inexpensive and small-output capacitors with lower voltage rating. The LED current is initially set with the external sense resistor RSET, and the feedback voltage is 250mV. Tiny package type TSOT-23-6 and WDFN-8L 2x2 packages provide the best solution for PCB space saving and total BOM cost.


  • Cellular Phones
  • Digital Cameras
  • PDAs and Smart Phones
  • Porbable Instruments
  • MP3 Player
  • OLED Power
  • Internet of Things
Key Spec.
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 5.5
Vout (max) (V) 20
LED Channels 3
Topology Boost
SW Freq (typ) (kHz) 1000
Vcs (typ) (mV) 250
Dimming Control PWM
Features Backlight;Cycle-by-Cycle Current Limit;Enable Input;OVP;UVP
Package Type TSOT-26;WDFN2x2-8
  • VIN Operating Range : 2.7V to 5.5V
  • Up to 85% Efficiency
  • 22V Internal Power N-MOSFET
  • 1MHz Switching Frequency
  • Built-in Diode
  • Digital Dimming with Zero-Inrush
  • Input UVLO Protection
  • Output Over Voltage Protection
  • Internal Soft Start and Compensation
  • TSOT-23-6 and 8-Lead WDFN Package
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateShareDownload
Tiny Package, High Performance, Diode Embedded White LED Driver2007/05/06
Technical Documents
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Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
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