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RT4537 是一款高效率白光 LED 驅動器，適用於單節或雙節電池供電系統，可驅動由六組並聯 LED 串所組成的背光模組，每串最多可支援 10 顆白光 LED（WLED）。內建電流汲入器（Current Sink）可提供最高 ±2% 的通道間電流誤差，確保各 LED 串之間具有優異的亮度一致性。 為了提供電流汲入器足夠的工作餘裕（Headroom），升壓控制器會監測各回授腳位中的最低電壓，並自動調整至最佳輸出電壓，以提升整體電源轉換效率。 RT4537 內建 I²C 介面，可用於控制調光模式、開關頻率及 LED 驅動電流。產品整合 250mΩ、耐壓 36V 的功率開關，並採用電流模式控制架構，提供過電流保護功能。 RT4537 的開關頻率可於 100kHz 至 1.6MHz 範圍內調整，讓設計人員可依效率需求與外部元件尺寸之間進行最佳化取捨。 RT4537 採用 WQFN-24L（3mm × 3mm、0.4mm Pin Pitch）封裝。
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<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage : 2.7V to 24V </li><li>High Output Voltage : Up to 36V </li><li>Channel Current Programmable : 3mA to 12.5mA </li><li>Channel Current Regulation with Accuracy ±3% and Matching ±2% </li><li>Dimming Controls <ul class="lv2"> <li></li><li>Direct PWM up to 25kHz with Minimum 1% Duty </li><li>PWM to Analog up to 2kHz with 12-Bit Resolution, Up to 4kHz with 11-Bit Resolution, Up to 8kHz with 10-Bit Resolution </li><li>PWM to Mixed Up to 2kHz with 12-Bit Resolution, Up to 4kHz with 11-Bit Resolution, Up to 8kHz with 10-Bit Resolution </li><li>PWM to Mixed-26KHZ up to 2kHz with 12-Bit Resolution, 4kHz with 11-Bit Resolution, Up to 8kHz with10-Bit Resolution </li></ul> </li><li>I2C Programs LED Current, Switching Frequency, Dimming Mode </li><li>Switching Frequency : 100kHz to 1.6 MHz </li><li>Embedded Memory with MTP. </li><li>Protections <ul class="lv2"> <li></li><li>LED Strings Open Protection </li><li>Current Limit Protection </li><li>Programmable Over Voltage Protection </li><li>Over Temperature Protection </li><li>Strings Short Detection </li></ul> </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Tablet and Notebook LED Backlight </li></ul></div>
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