RT8453B

RT8453B 1.5A, 500kHz, 40V High Voltage Buck LED Driver General Description The RT8453B is a buck current mode PWM regulator for LED driving applications. It provides an integrated 1.5A switch and can be operated with a wide input voltage range from 4.5V to 40V. With a 500kHz operating frequency, the RT8453B allows all external inductor and input/output capacitors to be small. High efficiency is achieved with its 190mV current sensing capability. Dimming can be either analog or PWM digital signal driven. The RT8453B is available in a small SOP-8 (Exposed pad) package. Ordering Information RT8453B Package Type SP : SOP-8 (Exposed Pad-Option 2) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Marking Information RT8453B GSPYMDNN RT8453BGSP : Product Number YMDNN : Date Code Features z Input Operating Range 4.5 to 40V z 1.5A Switching Current Limitation z 10% Constant Current Output Accuracy z Current Mode PWM with 500kHz Switching Frequency z Analog or PWM Control Signal for LED Dimming z Programmable Soft-Start z Input Under Voltage Lockout z Over Temperature Protection z RoHS Compliant and Halogen Free Applications z General Illumination z Desk Lights and Room Lighting z Industrial Backlight/Lighting z Constant Current Source Pin Configurations (TOP VIEW) ISN VC ACTL EN 8 27 GND 36 9 45...