RT8450

® RT8450/B High Voltage Multi-Topology LED Driver General Description The RT8450/B is a current mode PWM regulator for LED driving applications. With an 1.5A switch on board and wide input (4.5V to 40V) and/or output (up to 50V)ranges the RT8450/B can operate in any of the three common topologies : Buck, Boost or Buck-Boost. With 800k/500kHz operating frequency, the external PWM inductor and input/output capacitors can all be small. High efficiency is achieved by a 190mV current sensing. Dimming can be done either analog or PWM signal. An unique built-in clampping comparator and filtering resistor allow easy low noise analog dimming conversion from PWM signal with only one external capacitor. The RT8450/B is available in a TSSOP-16 (Exposed Pad) and WDFN-12L 3x3 packages. Ordering Information RT8450/B Package Type CP : TSSOP-16 (Exposed Pad) QW : WDFN-12L 3x3 (W-Type) (Exposed Pad-Option 1) Lead Plating System G : Green (Halogen Free and Pb Free) Switching Frequency 500kHz 800kHz 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 For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Features  High Voltage : VIN Up to 40V, VOUT Up to 50V  1.5A Switch Current  Buck, Boost or Buck-Boost Operation  Current Mode PWM with 800kHz (RT8450) and 500kHz (RT8450B) Switchin...