High Voltage Buck LED Driver with Dimming Control


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The RT4528 is a current-mode LED driver supporting wide input voltage range from 4.5V to 50V and output voltage up to 50V. With internal 500kHz operating frequency, the size of the external PWM inductor and input/output capacitors can be minimized. High efficiency is achieved by a 100mV current sensing control. LED dimming control can be done from either analog or PWM signal. The RT4528 provides an internal soft-start function to avoid inrush current and thermal shutdown to prevent the device from overheat.

The RT4528 is available in the SOP-8 (Exposed pad) package.


  • Desk Lights and Room Lighting
  • Industrial Display Backlight
Key Spec.
Status NRND
Recommended Alternative  RT8474
Vin (min) (V) 4.5
Vin (max) (V) 50
Vout (max) (V) 50
Topology Buck
SW Freq (typ) (kHz) 500
Vcs (typ) (mV) 100
Dimming Control Analog;PWM
Features Current Mode Control;OCP;UVP
Package Type PSOP-8
  • High Voltage : VIN Up to 50V, VOUT Up to 50V
  • Built-In 3A Power Switch
  • Current-Mode PWM Control
  • 500kHz Fixed Switching Frequency
  • Analog or PWM Control Signal for LED Dimming
  • Internal Soft-Start to Avoid Inrush Current
  • Under-Voltage Lockout
  • Thermal Shutdown
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
High Voltage Buck LED Driver with Dimming Control2013/12/27
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15