RT8475

® RT8475 High Voltage High Current LED Driver Controller for Buck, Boost or Buck-Boost Topology General Description The RT8475 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. With a current sense amplifier threshold of 190mV, the LED current is programmable with one external current sense resistor. With the maximum operating input voltage of 36V and output voltage up to 90V, the RT8475 is ideal for buck, boost or buck-boost operation. With the switching frequency programmable over 100kHz to 1MHz, the external inductor and capacitors can be small while maintaining high efficiency. Dimming can be done by either analog or digital. The builtin clamping comparator and filter allow easy low noise analog dimming conversion from digital signal with only one external capacitor. The RT8475 is available in SOP-14 and WQFN-16L 3x3 packages. Ordering Information RT8475 Package Type S : SOP-14 QW : WQFN-16L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) Note : 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. Features z High Voltage Capability : VIN Up to 36V, LED Sensing Threshold Common Mode Voltage Up to 90V z Buck, Boost or Buck-Boost Operation z Programmable Switching Frequency z Easy Dimming Control : Analog or Digita...