RT8453

Conceptual RT8453 High Voltage BUCK LED Driver General Description The RT8453 is a Buck current mode PWM regulator for LED driving applications. It has a 1.5A switch on board and can be operated with wide input range from 4.5V to 40V. With a 800kHz operating frequency, the external PWMinductor and input/output capacitors can all be small. High efficiency is achieved with a 190mV current sensing. Dimming can be either analog or PWM digital signal driven. The RT8453 is available in SOP8 (Exposed pad) package. Features z High Voltage : VIN up to 40V z 1.5A Switch Current z Current Mode PWM with 800kHz Switching z Frequency z Easy Dimming : Analog or Digital method z Programmable Soft Start to Avoid Inrush Current z VIN Under Voltage Lockout and Thermal Shutdown z RoHS Compliant and Halogen Free Ordering Information RT8453 Package Type SP : SOP-8 (Exposed Pad-Option 2) Operating Temperature Range G : Green (Halogen Free with Comme- rcial Standard) Note : Richtek Green 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. Applications z GPS, Portable DVD Backlight z Desk Lights and Room Lighting z Industrial Display Backlight Pin Configurations (TOP VIEW) ISN VC ACTL EN 8 27 GND 36 9 45 VCC SW GND SS SOP-8 (Exposed Pad) Typical Application Circuit VIN 4.5V to 40V Analog Dimming 5V R1 10k C2 3.3nF C1 RT8453 8 VCC ISN 1 3 ACTL R2 190mV R3 R4 4 EN 2 VC 5 S...