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The RT4531 is a dual-channel current source with high-efficiency asynchronous boost converter for backlight application. The RT4531 has built-in 1.5A/36V power MOSFET and two high current-matching capability current sink, so RT4531 can drives up 10s2p white LED. The RT4531 can allow very low voltage headroom control, therefore to improve LED strings efficiency effectively. <p align="justify">The RT4531 supports both PWM dimming and 1-wire digital dimming interface and it can realize 10 bit brightness code programming. </p><p align="justify">The RT4531 provides complete protection functions such as input Under-Voltage Lockout (UVLO), Over-Current Protection (OCP), Output Over Voltage (OVP) and Over-Temperature Protection (OTP). </p><p align="justify">The RT4531 is available in the WL-CSP-9B 1.35x1.35 (BSC) package.</p>
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<li class="mv5"> Input Voltage Range : 2.5V to 5.5V<br /></li><li class="mv5"> Internal Soft-Start, UVLO, OTP, OCP, OVP <br /></li><li class="mv5"> Typical Shutdown Current : < 1μA<br /></li><li class="mv5"> 1MHz Switching Frequency<br /></li><li class="mv5"> Drives Up to 10 WLEDs in Two Strings <br /></li><li class="mv5"> Independent PWM Dimming and 1-Wire Dimming Control <br /></li><li class="mv5"> PWM Dimming Frequency from 20k to 100kHz <br /></li><li class="mv5"> Up to 10 Bit Dimming Resolution <br /></li><li class="mv5"> LED Current Accuracy ± 2% (I<sub>FBx</sub> = 20mA) <br /></li><li class="mv5"> LED Current Matching ± 2% ( I<sub>FBx</sub> = 20mA) <br /></li><li class="mv5"> Built-in IFB1/IFB2 pin OVP, Short Protection, and Un-Use Detection</li>
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<li class="mv5"> Smart Phones<br /></li><li class="mv5"> Probable Instruments<br /></li><li class="mv5"> Backlight for Small and Media Form<br /></li><li class="mv5"> Factor LCD Display with Single-cell Battery Input</li>
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