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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. <p align="justify">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 is regulated to 200mV. </p><p align="justify">For brightness dimming, the RT4503A supports 32 steps pulse dimming which determines the feedback reference voltage, and RT4503 support PWM dimming which determines the feedback reference voltage. </p>
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<li class="mv5"> 2.5V to 5.5V Input Voltage Range<br /></li><li class="mv5"> 36V Open LED Protection for 10 WLEDs<br /></li><li class="mv5"> Pulse Dimming Brightness Control<br /></li><li class="mv5"> 200mV Reference Voltage with ±2% Accuracy<br /></li><li class="mv5"> 550kHz Switching Frequency<br /></li><li class="mv5"> Built-In Soft-Start<br /></li><li class="mv5"> Over-Temperature Protection<br /></li><li class="mv5"> Internal Compensation<br /></li><li class="mv5"> Current Limit</li>
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<li class="mv5"> Cellular Phones<br /></li><li class="mv5"> Digital Cameras<br /></li><li class="mv5"> Probable Instruments</li>
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