High Voltage Boost/SEPIC Controller


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The RT8480 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. With a low side current sense amplifier threshold of 190mV, the LED current is programmable with one external current sense resistor.

With programmable operating frequency up to 800kHz, the external inductor and capacitors can be small while maintaining high frequency.

Dimming can be done by either analog or digital. A built-in clamping comparator and filter allow easy low noise analog dimming conversion from digital signal with only one external capacitor. An unique True PWM dimming control is made easy with MOSFET under LED string. A very high dimming ratio can be achieved by adopting both analog/digital dimming and True PWM dimming together.

The RT8480 is available in a SOP-16 package.


  • General Industrial High Power LED Lighting
  • Desk Lights and Room Lighting
  • Building and Street Lighting
  • Industrial Display Backlight
  • DC-DC LED Drivers
Key Spec.
Status Active
Vin (min) (V) 6
Vin (max) (V) 36
LED Channels 1
Topology Boost
SW Freq (typ) (kHz) 380
Vcs (typ) (mV) 190
Dimming Control Analog;PWM;PWM-to-Analog
Features Adjustable Frequency;Adjustable Soft-Start;Enable Input;OCP;OVP
Package Type SOP-16
  • High Voltage Capability : VIN Up to 36V, VOUT is limited by External MOSFET Switch
  • Boost Operation
  • Current Mode PWM with Programmable Switching Frequency
  • Easy Dimming Control : Analog or Digital Converting to Analog with One External Capacitor
  • True PWM Dimming : External FET Driver is Build-In
  • Programmable Soft-Start to Avoid Inrush Current
  • Programmable Over Voltage Protection
  • VIN Under Voltage Lockout and Thermal Shutdown
  • 16-Lead SOP Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
High Voltage Boost/SEPIC Controller2010/09/03
Title Last Update ShareDownload
High Voltage Boost/SEPIC Controller 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Power Solutions for LED Lighting Applications2018/11/22
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8480GSSOP-162500 Not available Buy from Distributor