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RT4501/A 是用于背光应用的高效率 LED 驱动器，它采用集成了肖特基二极管的异步 Boost 转换器和电流源驱动器，可在 2.5V~5.5V 的输入电压范围内支持每通道6只 LED 的应用。一个可工作在快速模式和高速模式的 I<sup>2</sup>C 接口可支持其实现对背光的控制，它可以线性映像的方式实现256级亮度调节。同时，它也支持采用 PWM 信号进行亮度调节。在亮度调节方法上，RT4501A 支持以脉冲方式实现128级亮度调节，RT4501则支持以 PWM 调光方式进行256级亮度调节。RT4501/A 具有完善的保护功能，如输入欠压锁定保护、过流、过压保护和过热保护。过压保护的阈值电压可根据不同应用的需要选择为 16V 或 25.5V 。它的封装是 WL-CSP-10B 0.87x2.07。
/content/dam/richtek-eds/resources/product-specifications/rt45/rt4501/rt4501a/images/circuit/99822lstar.GIF
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<li class="mv5"> 输入电压范围：2.5V~5.5V</li><li class="mv5"> 集成了肖特基二极管</li><li class="mv5"> 兼容快速模式的 I<sup>2</sup>C 接口</li><li class="mv5"> 驱动多达7只串联的2串 WLED</li><li class="mv5"> 外部 PWM 或脉冲亮度控制方式</li><li class="mv5"> 550kHz/1MHz 开关工作频率</li><li class="mv5"> 内建软启动功能</li><li class="mv5"> PWM 调光/脉冲调光的精细度可达256/128级</li><li class="mv5"> I<sup>2</sup>C 可编程的256级线性电流调节</li><li class="mv5"> 使用小型电感，效率可达85%</li><li class="mv5"> 16V/25V可编程过压保护</li><li class="mv5"> 电流精度：±5%；电流平衡：±3%</li><li class="mv5"> 欠压锁定、过压保护、过流保护和过热保护</li><li class="mv5"> 关机电流：<1µA</li><li class="mv5"> 使用温度范围：-40°C~85°C</li><li class="mv5"> 符合 RoHS 规范，不含卤素</li>
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<li class="mv5"> 移动电话</li><li class="mv5"> 数码相机</li><li class="mv5"> PDA 和智能手机</li><li class="mv5"> 便携式设备</li>
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