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RTQ4552 是一款 6 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。RTQ4552 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。RTQ4552 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 频率可通过外部电阻或 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。RTQ4552 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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<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage: 5V to 40V - Support Cold Crank Down to 3V Supply After Start-Up </li><li>High Output Voltage: Up to 45V </li><li>NMOS or PMOS Input Protection Switch </li><li>Integrated Boost and SEPIC Controller for LED Driver - Switching Frequency: 300kHz to 2.2MHz - Spread Spectrum for Reduced EMI - Automatic Output Voltage Discharged When Controller Is Disabled </li><li>6-Channel Current Sinks with 30mA to 170mA per Channel </li><li>Channel Current Regulation with Accuracy ±3.5% and Matching 3.5% </li><li>Up to 16-Bit Dimming Resolution with I<sup>2</sup>C or PWM Input </li><li>Programmable Multi-Dimming Operation Mode - Up to 16-Bit PWM and Mixed Dimming Resolution - Up to 12-Bit DC Dimming Resolution </li><li>Dimming Ratio 32000:1 in PWM Mode Using a 152Hz Output PWM Frequency </li><li>Dimming Ratio 4000:1 in DC Mode </li><li>Advanced Sloper Function for Smooth Dimming </li><li>Phase-Shift PWM Mode Reduces Audible Noise </li><li>Adaptive Headroom Control Method to Optimize Output Voltage for Power Efficiency </li><li>Protections - LED Open and Short Fault - Boost OCP, OVP and UVP Protection - VIN OVP, OCP and UVLO Fault - Warming and Over-Temperature Protection - Extensive Fault Diagnostics and Fault Indicator Signal Output </li><li>Embedded Memory with MTP </li><li>AEC-Q100 Grade 1 Qualified </li><li>Ambient Temperature Range: -40°C to 125°C </li><li>Junction Temperature Range: -40°C to 150°C </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Automotive Infotainment Display </li><li>Automotive Instrument Clusters </li><li>Heads-Up Display </li></ul></div>
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