RT8498GE

The RT8498GE from Richtek is a 18V multi-topology LED driver with dimming control in 6 pin SOT-23 package. 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 analogue 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 specifically designed to be operated in buck, boot and buck-boost converter applications. This device uses a fixed frequency, current-mode control scheme to provide excellent line and load regulation. It is used in GPS, portable DVD backlight, display cabinet lamp and room lighting and IP camera.

• Built-in 2A power switch
• Current-mode PWM control
• 350KHz fixed switching frequency, 3mA supply current, 20µA input current
• Analogue, PWM digital or PWM converting to analogue 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
• Operating temperature range from -40°C to 85°C