RT4503 - Richtek Technology

RT4503 Asynchronous Boost Converter

The RT4503/A is a highly integrated LED driver IC capable of driving 10 WLEDs in series. It is composed of a current mode Boost converter integrated with a 36V/1.2A power switch. The RT4503/A supports a wide input voltage range from 2.5V to 5.5V and runs at a fixed frequency of 550kHz. The LED current is set via an external resistor and the feedback voltage .

Features

 2.5V to 5.5V Input Voltage Range
 36V Open LED Protection for 10 WLEDs
 Pulse Dimming Brightness Control
 200mV Reference Voltage with ±2% Accuracy
 550kHz Switching Frequency
 Built-In Soft-Start
 Over-Temperature Protection
 Internal Compensation
 Current Limit Ordering Information RT4503/A Package Type QW : WDFN-6L 2x2 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : RT4503 : PWM Dimming RT4503A : Pulse Dimming Richtek products are :  RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020.  Suitable for use in SnPb .