Asynchronous Boost Converter for 10 WLEDs


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The RT4503/A is a highly integrated LED driver IC capable of driving 10 WLEDs in series. It is composed of a current mode Boost converter integrated with a 36V/1.2A power switch.

The RT4503/A supports a wide input voltage range from 2.5V to 5.5V and runs at a fixed frequency of 550kHz. The LED current is set via an external resistor and the feedback voltage is regulated to 200mV.

For brightness dimming, the RT4503A supports 32 steps pulse dimming which determines the feedback reference voltage, and RT4503 support PWM dimming which determines the feedback reference voltage.


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Key Spec.
RT4503 RT4503A
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
Vout (max) (V) 36 36
LED Channels 1 1
Topology Boost Boost
SW Freq (typ) (kHz) 550 550
Vcs (typ) (mV) 200 200
Dimming Control PWM Pulse
Features Backlight;Cycle-by-Cycle Current Limit;Enable Input;OVP;UVP Backlight;Cycle-by-Cycle Current Limit;Enable Input;OVP;UVP
Package Type WDFN2x2-6 WDFN2x2-6
  • 2.5V to 5.5V Input Voltage Range
  • 36V Open LED Protection for 10 WLEDs
  • Pulse Dimming Brightness Control
  • 200mV Reference Voltage with ±2% Accuracy
  • 550kHz Switching Frequency
  • Built-In Soft-Start
  • Over-Temperature Protection
  • Internal Compensation
  • Current Limit
TitleLast UpdateShareDownload
Asynchronous Boost Converter for 10 WLEDs2014/08/01
Technical Documents
TitleLast UpdateShareDownload
Power Mangement Components for Lithium-Ion Battery Powered Applications2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT4503GQWWDFN2x2-62500 Not available Buy from Distributor