1.5A具有低导通阻抗的线性开关2A Line Switch with Low On-Resistance CXES4290是一低漏失的线性开关，具有开/关控制、输出电流软启动和输出限流的功能.应用时，将CXES4290连接至降压DC/DC的输出端，使能引脚控制每路开/关以最大效率来传递电压。因此，CXES4290能延长电池的寿命和工作时间。CXES4290的功能包括了电流限制保护电路

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      CXES4290是一低漏失的线性开关，具有开/关控制、输出电流软启动和输出限流的功能.应用时，将CXES4290连接至降压DC/DC的输出端，使能引脚控制每路开/关以最大效率来传递电压。因此，CXES4290能延长电池的寿命和工作时间。CXES4290的功能包括了电流限制保护电路，不需要在芯片外部增加额外的电阻和MOSFET来实现此功能。可以利用外部可编程的软启动功能来设置上电时序，以避免启动阶段的输入电流过冲。当EN引脚接低电压时，IC进入关断模式。此时，即使芯片的输出端连接容性负载，电容负载上存储的电荷也会被内部的放电开关快速放电至地，从而输出VOUT的电压也会快速下降到地。CXES4290还包括了过流和过热保护功能。CXES4290具有反向电流保护功能，当输入断电后会阻值任何电流通过功率管反向流到输入端。The CXES4290 is a low dropout line switch IC with ON/OFF control, output soft-start and output current protection which integrates a P-channel MOSFET. By connecting the CXES4290 to the output pin of a step-down DC/DC converter, the EN pin controls ON/OFF for each distribution switch to deliver power per requirements and maximize total power efficiency. As a result, the CXES4290 helps to extend battery life and product operation time. The CXES4290 contains a current limit and protection circuit, so the external MOSFETs and resistors are not required unlike discrete circuit solutions. Externally programmable soft-start allows for proper power on sequencing with respect to other power supplies and avoids input inrush current during startup. When a low signal is input to the EN pin, the IC enters shutdown mode. Even where a load capacitor is connected to the output pin during shutdown, the electric charge stored at the load capacitor is discharged through the internal switch. As a result, the VOUT pin voltage falls quickly to the GND level. The CXES4290 contains over current protection. The CXES4290 eliminates any reversed current flow across the switch when it is powered off.

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•1.4V到5.5V的输入电压范围</p>

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1.4V to 5.5V Input Voltage Range7kj嘉泰姆

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