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Product Spec Banner
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The RT4831 is an integrated four-channel backlight WLED driver with LCD bias supply for portable device. The backlight WLED driver supports up to 4P8S WLED configuration. Meanwhile, the driver maximum acceptable output voltage is 29V. Each channel current is controlled by the I<sup>2</sup>C interface and/or the external PWM input to achieve 11 bit LED current steps from 60μA to 30mA in exponential or linear mapping curves. The LCD bias supply is implemented with a Boost, a LDO and an inverting charge pump to provide positive and negative voltage. The LCD bias provides up to 150mA output current and the output voltage can be programmed via I<sup>2</sup>C interface from ±4V to ±6.5V with 50mV/step. The RT4831 is available in a WL-CSP-24B 1.84x2.68 (BSC) package.
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<div class="spec-list"><ul class="lv1"><li>System </li><li>Hardware Enable Pin </li><li>I<sup>2</sup>C Controlled Interface </li><li>Over-Temperature ProtectionBacklight WLED Driver </li><li>2.7V to 5V Input Voltage Range </li><li>Drives Up to 4P8S WLED Configuration (29V Maximum Output Voltage) </li><li>External PWM Input and I<sup>2</sup>C Brightness Control </li><li>11 Bit Exponential and Linear Dimming Control </li><li>Programmable Over-Voltage Protection </li><li>Programmable Over-Current Protection </li><li>Auto Operating Frequency (250kHz, 500kHz, 1MHz) </li><li>WLED Current Ramp Up / Ramp Down SmoothenLCD Bias Supply </li><li>2.7V to 5V Input Voltage Range </li><li>Programmable Positive / Negative Output Voltage from ±4V to ±6.5V with 50mV/Step </li><li>Programmable Boost Output Voltage from 4V to 7.15V with 50mV/Step </li><li>150mA Output Current Capability </li><li>Output Short-Circuit Protection<p></p> </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>LCD Panels with up to 32 LEDs </li><li>Smartphone </li><li>Tablet </li></ul></div>
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