单通道的USB电源开关USB Power-Distribution Switch with Fault Blanking CXUS7746A是一种单信道的电源开关芯片，内部集成了一个75mΩ 的P型MOSFET功率管，该芯片主要应用于USB电源系统。当输出负载过重或者短路时，芯片会进入限流保护模式，此时会拉低限流指示信号OCB。如负载持续超载或短路，芯片内部温度会迅速上升，进入过温保护模式

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     CXUS7746A是一种单信道的电源开关芯片，内部集成了一个75mΩ 的P型MOSFET功率管，该芯片主要应用于USB电源系统。当输出负载过重或者短路时，芯片会进入限流保护模式，此时会拉低限流指示信号OCB。如负载持续超载或短路，芯片内部温度会迅速上升，进入过温保护模式，芯片会切断功率管以防止芯片损毁。 此外，CXUS7746A内置了电源欠压保护功能，即当电源电压过低时，芯片也会切断功率管。直至电源电压恢复至正常范围后，才恢复正常工作。OCB是开漏端输出的限流标识引脚，用于标识芯片是否处于过流或者过温保护状态。芯片内置了8ms的延时功能以防止OCB误动作，向主机提供错误的指示信号，例如输出接大电容负载时会出现短时限流。此外，CXUS7746A内置了反向电流保护功能防止关断时出现反向电流。CXUS7746A封装采用SOT23-5封装，工作温度范围是(-40℃to +85℃)。The CXUS7746A is an incorporated 75mΩ P-channel MOSFET power-distribution switch for self-powered and bus-powered Universal Serial Bus (USB) applications. When the output load exceeds the current-limit threshold or a short is present, the device limits the output current to safe level by switching into a constant-current limit mode with fold back, pulling the over-current ( OC) logic output low. When continuous heavy overloads or short-circuits increase the power dissipation in the switch, causing the junction temperature to rise, a thermal protection circuit shutdown the switch to prevent damage. Internal Under Voltage Lock-Out (UVLO) circuitry ensures that the switch remains off until valid input voltage is present. OC is open-drain output which is asserted when over-current or over-temperature event occurs. A 8ms fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, preventing false alarms to the host system. The CXUS7746A eliminates any reversed current flow across the switch when it is powered off. The CXUS7746A is available in SOT23-5 package, operates over the extended (-40°C to +85°C) temperature range.

   产品特点 返回TOPq0L嘉泰姆

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• 75mΩ 导通电阻</p>

• 工作电压: 2.7V to 5.5Vq0L嘉泰姆

• 欠压保护功能q0L嘉泰姆

• 11μA 静态电流</p>

• 1μA 关断电流q0L嘉泰姆

• CXUS7746A高电平使能</p>

• 关断后无反向电流q0L嘉泰姆

• 带延时的开漏端过流指示信号(OCB)q0L嘉泰姆

• 输出关断泄放支路q0L嘉泰姆

• SOT23-5封装q0L嘉泰姆

• RoHS 适用和100% 无铅无鲁q0L嘉泰姆

100m
POWER MOSFETq0L嘉泰姆

Operating Range : 2.7V to 5.5Vq0L嘉泰姆

Under Voltage Lockoutq0L嘉泰姆

11μA Quiescent Currentq0L嘉泰姆

1μA Shutdown Currentq0L嘉泰姆

Logic Level Enable Pin, Available withq0L嘉泰姆

Active-Low or Active-High Versionq0L嘉泰姆

No Reverse Current when Power Offq0L嘉泰姆

Fault Blanking Open-Drain Over-Current Flagq0L嘉泰姆

Output (OC)q0L嘉泰姆

Output Shutdown Pull-low Resistorq0L嘉泰姆

Available in SOT23-5,MSOP-8 and MSOP-8q0L嘉泰姆

(EP) Packagesq0L嘉泰姆

RoHS Compliant and 100% Lead(Pb)-Freeq0L嘉泰姆

Halogen-Freeq0L嘉泰姆

UL Listed-File No. E334299q0L嘉泰姆

   应用范围 返回TOPq0L嘉泰姆

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•USB 埠和自供电集线器q0L嘉泰姆

•USB 总线供电集线器</p>

•热插拔电源系统</p>

•常规high side开关应用</p>

USB Ports and Self-Powered Hubsq0L嘉泰姆

USB Bus-Powered Hubsq0L嘉泰姆

Hot Plug-In Power Suppliesq0L嘉泰姆

General Purpose High Side Switch Applicationsq0L嘉泰姆

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