Asynchronous Boost Converter for 10 WLEDs


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The RT4533/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 36.5V/1.2A power switch.

The RT4533/A supports a wide input voltage range from 2.5V to 5.5V and runs at a fixed frequency of 1.1MHz. The LED current is set via an external resistor and the feedback voltage is regulated to 200mV / 300mV.

For brightness dimming, the RT4533/A supports PWM dimming which determines the feedback reference voltage.


Key Spec.
RT4533 RT4533A
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
SW Freq (typ) (kHz) 1100 1100
Number of LEDs (max) (pcs) 10 10
Iout (max)/channel (mA) 30 30
Iq (typ) (mA) 0.35 0.35
Dimming Control PWM PWM
Topology Boost Boost
Features 100% Duty Cycle;OCP;OVP 100% Duty Cycle;OCP;OVP
Package Type TSOT-26 TSOT-26
  • 2.5V to 5.5V Input Voltage Range
  • 36.5V Open LED Protection for 10 WLEDs
  • PWM Dimming Brightness Control
  • 200mV / 300mV Reference Voltage with ±2% Accuracy
  • 1.1MHz Switching Frequency
  • Built-In Soft-Start
  • Over-Temperature Protection
  • Internal Compensation
  • Current Limit
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Asynchronous Boost Converter for 10 WLEDs2014/09/03
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
Evaluation Boards
TitleLast UpdateShareDownload
Asynchronous Boost Converter for 10 WLEDs2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT4533AGJ6TSOT-263000 Not available Buy from Distributor
RT4533GJ6TSOT-263000 Not available Buy from Distributor