The RT8498 is a current-mode LED driver supporting wide input voltage range from 3V to 18V and output voltage up to 18V. With internal 350kHz 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 RT8498 provides an internal soft-start function to avoid inrush current and thermal shutdown to prevent the device from overheat.

The RT8498 is available in the SOT-23-6 package.


  • GPS, Portable DVD Backlight
  • Display Cabinet Lamp and Room Lighting
  • IP Camera
Key Spec.
Status Active
Vin (min) (V) 3
Vin (max) (V) 18
Vout (max) (V) 18
LED Channels 1
Topology Boost;Buck;Buck-boost
SW Freq (typ) (kHz) 350
Vcs (typ) (mV) 100
Dimming Control Analog;PWM;PWM-to-Analog
Features Current Mode Control;Cycle-by-Cycle Current Limit;OVP
Package Type SOT-26
  • High Voltage : VIN Up to 18V, VOUT Up to 18V
  • Built-In 2A Power Switch
  • Current-Mode PWM Control
  • 350kHz Fixed Switching Frequency
  • Analog, PWM Digital or PWM Converting to Analog with One External Capacitor
  • Internal Soft-Start to Avoid Inrush Current
  • Under-Voltage Lockout
  • Internal Over Voltage Protection to Limit Output Voltage
  • Cycle-by Cycle Current Limit
  • Thermal Shutdown