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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. The RT4531 supports both PWM dimming and 1-wire digital dimming interface and it can realize 10 bit brightness code programming. 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). The RT4531 is available in the WL-CSP-9B 1.35x1.35 (BSC) package.
RT4531 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Input Voltage Range : 2.5V to 5.5V </li><li>Internal Soft-Start, UVLO, OTP, OCP, OVP </li><li>Typical Shutdown Current : < 1μA </li><li>1MHz Switching Frequency </li><li>Drives Up to 10 WLEDs in Two Strings </li><li>Independent PWM Dimming and 1-Wire Dimming Control </li><li>PWM Dimming Frequency from 20k to 100kHz </li><li>Up to 10 Bit Dimming Resolution </li><li>LED Current Accuracy ± 2% (I<sub>FBx</sub> = 20mA) </li><li>LED Current Matching ± 2% ( I<sub>FBx</sub> = 20mA) </li><li>Built-in IFB1/IFB2 pin OVP, Short Protection, and Un-Use Detection </li></ul></div>
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RT4531 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Smart Phones </li><li>Probable Instruments </li><li>Backlight for Small and Media Form </li><li>Factor LCD Display with Single-cell Battery Input </li></ul></div>
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