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RT4505 是一款最高開關頻率可達 4MHz 的同步升壓轉換器，並整合一組可提供 1.5A 恆流輸出的高電流白光 LED 驅動器。其高端電流源架構支援 LED 陰極接地操作，可提供最高 1.5A 的閃光電流。自適應調節機制可確保電流源維持穩定調節狀態，同時達到最佳轉換效率。 RT4505 透過相容 I²C 的介面進行控制。產品具備硬體閃光使能（STROBE）功能，可透過邏輯訊號直接觸發閃光脈衝；同時提供 TX 輸入訊號，可在射頻功率放大器（RF PA）工作或其他高電流負載情況下，將閃光電流切換至較低電流模式，以實現系統同步控制。 最高 4MHz 的開關頻率、過壓保護功能以及可調式電流限制設定，可搭配體積小巧、低高度的電感與陶瓷電容使用，進一步縮小系統尺寸。 RT4505 採用 WL-CSP-9B（1.3mm × 1.37mm，BSC）封裝，工作溫度範圍為 -40°C 至 85°C。
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<div class="spec-list"><ul class="lv1"><li>1.5A High-Side Current Source for Single LED </li><li>Up to 90% Efficiency in Torch Mode and Flash Mode </li><li>Typical 5% LED Current Accuracy </li><li>Typical 7.5% Timeout Accuracy </li><li>Programmable Flash LED Current from 93.74mA to 1.5A </li><li>Programmable Torch LED Currents from 49.6mA to 375mA </li><li>Built-In Soft-Start Operation for Battery Protection </li><li>Built-In Over-Voltage Protection, Over-Current Protection, and Over-Temperature Protection </li><li>VIN Flash Monitor Optimization </li><li>Hardware Strobe Enable </li><li>Synchronization Input for RF Power Amplifier Pulse Events </li><li>400KHz I<sup>2</sup>C Control Interface </li><li>9-Ball WL-CSP Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Camera Phone LED Flash </li></ul></div>
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