RT8473

® RT8473 1A, Hysteretic, High Brightness LED Driver with Internal Switch General Description The RT8473 is a high efficiency, continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs from a voltage source higher than the LED voltage. It operates from an input voltage of 7V to 30V and employs hysteretic control with a high side current sense resistor to set the constant output current. The RT8473 includes an output switch and a high side output current sensing circuit, which uses an external resistor to set the nominal average output current. LED brightness control is achieved with PWM dimming from an analog or PWM input signal. The RT8473 is available in a small TSOT-23-5 package. Ordering Information RT8473 Package Type J5 : TSOT-23-5 Note : Lead Plating System G : Green (Halogen Free and Pb Free) Richtek products are : ` RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Marking Information 05=DNN 05= : Product Code DNN : Date Code Features z 7V to 30V Input Voltage Range z Hysteretic Control with High Side Current Sensing z Internal N-MOSFET with 350mΩ Low RDS(ON) z 1A Output Current z Up to 97% Efficiency z Typical ±5% LED Current Accuracy z Analog or PWM Control Signal for LED Dimming z 300Hz On-Board Ramp Generator z Input Under Voltage Lockout z Thermal Shutdown Protection z RoHS Compliant and Halogen Free Appl...