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RT4803 能在电池电压低于系统所用电压调节器件需要的最低电压时将电池电量挖掘出来供系统使用，使化学电池的优势得到充分的发挥，其内部集成有功率开关和同步整流开关，静态耗电低，为锂离子电池的应用提供了一个非常紧凑的解决方案。</br>RT4803 的核心是一个 Boost 转换器，锂离子电池供电时的最大负载能力达 2A，关机模式下的电流消耗低于 1μA，同时又支持以直通模式工作，两个模式间可以平滑切换，可以最大限度延长电池使用时间。</br>RT4803 以 WL-CSP-16B 1.67x1.67 (BSC) 封装供货。
/content/dam/richtek-eds/resources/product-specifications/rt48/rt4803/images/circuit/94808mbmno.jpg
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<li class="mv5"> 外部元件仅需 4 个：0.47μH 电感和 0603 规格的输入、输出电容</li><li class="mv5"> 输入电压范围：1.8V-5V</li><li class="mv5"> 输出电压可调范围：2.85V-4.4V<br>► VSEL = L 预设输出为 3.3V<br>► VSEL = H 预设输出为 3.55V</li><li class="mv5"> 最大连续负载能力：2A@V<sub>IN</sub> > 2.65V，V<sub>OUT</sub> = 3.35V</li><li class="mv5"> 效率高达 96%</li><li class="mv5"> 输入电压高于输出电压时处于直通模式</li><li class="mv5"> 内部集成同步整流开关</li><li class="mv5"> 软启动，负载真断开</li><li class="mv5"> 支持强制直通模式</li><li class="mv5"> 短路保护</li><li class="mv5"> I<sup>2</sup>C 控制接口</li><li class="mv5"> 超低静态电流</li><li class="mv5"> 小型 WL-CSP 16B 封装</li><li class="mv5"> 放电功能</li>
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<li class="mv5"> 使用锂离子电池、磷酸铁锂电池的智能手机、平板电脑</li><li class="mv5"> 数据卡</li>
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