EUP3508-1.5A具有低导通阻抗的线性开关  DataSheet
概述
EUP3508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EUP3508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，EUP3508能延长电池的寿命和工作时间。
EUP3508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。EUP3508还包括了过流和过热保护功能。EUP3508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。
特点
•1.4V到5.5V的输入电压范围
•低导通电阻
•低关断电流：<2uA
•开/关控制
•高速自动放电
•可编程输出电流软启动
•输出电流限制
•掉电零反向电流
•过温关断
•2mm×2mm TDFN-6和0.9mm×1.4mm WCSP-6封装
•符合RoHS规范及Pb-Free
应用
‧机顶盒
‧超级本
‧平板电脑
‧便携式电子设备
‧智能手机
‧无线手机
EUP3508-1.5A Line Switch with Low On-Resistance
Description
The EUP3508 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 EUP3508 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 EUP3508 helps to extend battery life and product operation time.
The EUP3508 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 EUP3508 contains over current protection and thermal shutdown protection. The EUP3508 eliminates any reversed current flow across the switch when it is powered off.
Feature
•1.4V to 5.5V Input Voltage Range
•Low On Resistance
•Low Shutdown Current: <2μA
•ON/OFF Control
•High Speed Auto Discharge
•Programmable Output Current Soft-start
•Output Current Limit
•No Reverse Current when Power Off
•Thermal Shutdown
•Available in 2mm×2mm TDFN-6 and 0.9mm×1.4mm WCSP-6
•RoHS Compliant and 100% Lead (Fb)-Free Halogen-Free
Application
•Set-top Boxes
•Ultrabook
•Tablet PC
•Portable Electronics Devices
•Point of Sales Terminals
•Smartphones
•Wireless Handsets
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