High Voltage High Current LED Driver


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The RT8477 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications with wide input voltage (4.5V to 50V) and output voltage (up to 50V) ranges. With internal 380kHz 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 by analog.

The RT8477 is now available in the SOP-8 package.


  • Desk Lights and Room Lighting
  • Industrial Display Backlight
Key Spec.
Status NRND
Recommended Alternative  RT8477A
Vin (min) (V) 4.5
Vin (max) (V) 50
Vout (max) (V) 50
Topology Boost;Buck;Buck-boost
SW Freq (typ) (kHz) 380
Vcs (typ) (mV) 100
Dimming Control Analog;PWM
Features Current Mode Control;Internal Compensation;OCP;UVP
Package Type SOP-8
  • Support Multiple-Topologies (Buck/Boost/Buck-Boost)
  • High Voltage : VIN up to 50V, VOUT up to 50V
  • 380kHz 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
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8477GSSOP-82500 Not available Buy from Distributor