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RTQ4554-QT 是一款 4 通道 LED 驱动器，具备 DC-DC 控制器，每个通道可提供 170mA 电流。电流模式开关式 DC-DC 控制器支持升压或 SEPIC 拓扑，并在 300kHz 至 2.2MHz 频率范围内运行。此器件接受 3V 至 40V 的宽输入电压范围，并可承受直接车载冷启动与负载突降事件。内部电流灌入器支持最大 3.5% 电流精度与不匹配，可在每串 LED 中实现优异的亮度均匀性。RTQ4554-QT 会在运行期间自动检测任何未连接及 / 或断裂的灯串，并将其自控制环路中断开，以防止 VLED 过压。为提供电流灌入器运行所需的足够余量，升压控制器会监测 LEDx 引脚的最低电压，并调节优化输出电压以提升电源效率。RTQ4554-QT 具备标准 I<sup>2</sup>C 数字接口，用于功能设置。此外，升压开关频率与 PWMO 频率可通过 I<sup>2</sup>C 接口进行编程设置。完整诊断信息亦可通过 I<sup>2</sup>C 接口取得。当异常情况发生时，状态信号将被发送至系统。RTQ4554-QT 采用 24-pin WQFN 封装，并可在 -40°C 至 125°C 的温度范围内运行。
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<li class="mv5"> Wide Operating Input Voltage: 5V to 40V<br /> ► Support Cold Crank Down to 3V Supply After Start-Up<br /> </li><li class="mv5"> High Output Voltage: Up to 45V<br /> </li><li class="mv5"> NMOS or PMOS Input Protection Switch<br /> </li><li class="mv5"> Integrated Boost and SEPIC Controller for LED Driver<br /> ► Switching Frequency: 300kHz to 2.2MHz<br /> ► Spread Spectrum for Reduced EMI<br /> ► Automatic Output Voltage Discharged When Controller Is Disabled<br /> </li><li class="mv5"> 4-Channel Current Sinks with 30mA to 170mA per Channel<br /> </li><li class="mv5"> Channel Current Regulation with Accuracy ±3.5% and Matching 3.5%<br /> </li><li class="mv5"> Up to 16-Bit Dimming Resolution with I<sup>2</sup>C or PWM Input<br /> </li><li class="mv5"> Programmable Multi-Dimming Operation Mode<br /> ► Up to 16-Bit PWM and Mixed Dimming Resolution<br /> ► Up to 12-Bit DC Dimming Resolution<br /> </li><li class="mv5"> Dimming Ratio 32000:1 in PWM Mode Using a 152Hz Output PWM Frequency<br /> </li><li class="mv5"> Dimming Ratio 4000:1 in DC Mode<br /> </li><li class="mv5"> Advanced Slope Function for Smooth Dimming<br /> </li><li class="mv5"> Phase-Shift PWM Mode Reduces Audible Noise<br /> </li><li class="mv5"> Adaptive Headroom Control Method to Optimize Output Voltage for Power Efficiency<br /> </li><li class="mv5"> Protections<br /> ► LED Open and Short Fault<br /> ► Boost OCP, OVP, and UVP Protection<br /> ► VIN OVP, OCP, and UVLO Fault<br /> ► Warming and Over-Temperature Protection <br /> ► Extensive Fault Diagnostics and Fault Indicator Signal Output<br /> </li><li class="mv5"> Embedded Memory with MTP<br /> </li><li class="mv5"> AEC-Q100 Grade 1 Qualified<br /> </li><li class="mv5"> Ambient Temperature Range: -40°C to 125°C <br /> </li><li class="mv5"> Junction Temperature Range: -40°C to 150°C</li>
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<li class="mv5"> Automotive Infotainment Displays<br /> </li><li class="mv5"> Automotive Instrument Clusters<br /> </li><li class="mv5"> Heads-Up Displays</li>
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