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Product Spec Banner
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RT4537 是一款高效率白光 LED 驱动器，适用于单节或双节电池供电系统，可驱动由六组并联 LED 串组成的背光模组，每串最多支持 10 颗白光 LED（WLED）。内置电流吸收器（Current Sink）可提供最高 ±2% 的通道间电流误差，确保各 LED 串之间具有优异的亮度一致性。 为了给电流吸收器提供足够的工作裕量（Headroom），升压控制器会监测各反馈引脚中的最低电压，并自动调节至最佳输出电压，以提高整体电源转换效率。 RT4537 内置 I²C 接口，可用于控制调光模式、开关频率及 LED 驱动电流。产品集成 250mΩ、耐压 36V 的功率开关，并采用电流模式控制架构，提供过电流保护功能。 RT4537 的开关频率可在 100kHz 至 1.6MHz 范围内调节，让设计人员能够根据效率需求与外围元件尺寸之间进行优化取舍。 RT4537 采用 WQFN-24L（3mm × 3mm、0.4mm 引脚间距）封装。
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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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