XT9701 是一款只有 150mΩ 导通电阻，应用于 USB 供 电的电源开关电路。内置电荷泵升压来驱动 NMOS 功率管， 当处于关断状态时通过寄生的反向体二极管来消除开关的反 向导通电流。低的静态功耗（23?A）和小封装（SOT-23-5） 特别适合电池供电的便携式设备使用。 保护电路包括防止上电过程中的涌入电流的软启电路， 过流保护的电流分为 900mA 和 600mA 两种，内置热关断保 护电路以及短路保护电路。

The LN9703 is a low voltage, high performance single N-MOSFET power switch, designed for power rail on/off control with low RDS(ON)≈70mΩ and full protection functions. The LN9703 equipped with a charge pump circuitry to drive the internal MOSFET switch and a flag output is available to indicate fault conditions against large di/dt which may cause the supply to fall out of regulation. In order to fit different application, an ISET pin is offered for current limit point setting, a resistor from ISET to ground sets the current limit for the switch. Additional features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic switch failure from high-current loads, Output anti back irrigation Protection whether EN pin is connected GND or VIN, under-voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present, a precision resistor-programmable output current limit up to 3.5A. Besides, the lower quiescent current as 40μA making this device ideal for portable battery-operated equipment. The LN9703 is available in SOT23-5 or SOP-8 package requiring minimum board space and smallest components.

LN3005 是一个双通道单刀双掷模拟开关(SPDT)，适用 于通信系统，医疗设备和其它便携式电池供电设备。它采用 CMOS 工艺，具有双向，超低阻值，低功耗，低漏电流，高 速，高带宽的特点，非常适合电池供电的便携式产品采用。 其极低的开关阻抗——0.5Ω(TYP)和快速开关时间—— tON=16ns, tOFF=15ns，可以大大减少电池供电便携式产品的 信号损失，改善音频及视频输出级。LN3005 在封装上采用 了 DFN-10 和 MSOP-10 的封装，体积小巧，节省了很多空 间。LN3005 集成了两个单刀双掷开关，由两个常开 NO 和 两个常关 NC 开关组成，可以用来作为 2 选 1 的多路选择开 关。