具有限流指示功能的双通道电源开关Dual Power-Distribution Switch with Fault-Blanking CXUS7743是一种双信道的电源开关芯片，内部集成了两个100mΩ 的P型MOSFET功率管，每个信道各有一个逻辑使能控制信号。当负载超出限制范围或者有短路情况发生的时候，芯片会进入限流模式，把负载电流控制在安全区域内，同时拉低限流指示信号OCB(s)

   产品概述 返回TOPosx嘉泰姆

      CXUS7743是一种双信道的电源开关芯片，内部集成了两个100mΩ 的P型MOSFET功率管，每个信道各有一个逻辑使能控制信号。当负载超出限制范围或者有短路情况发生的时候，芯片会进入限流模式，把负载电流控制在安全区域内，同时拉低限流指示信号OCB(s)，CXUS7743和CXUS7743-15每个通道的限流电流设置典型值分别为1A和2.5A。并且具有fold back功能；如果持续存在超重负载或者短路情况，芯片内部温度和功耗将迅速上升，芯片将检测到过温状况，并自动进入保护状态，切断功率信道以防止芯片损毁；另外，CXUS7743还具有检测输入电源的功能，功率管会维持关断直到电源电压超过欠压阈值范围。OCB(s)是具有开漏输出的限流标记引脚，8ms的延时功能可以屏蔽错误的限流信号，防止芯片向主机系统发出错误的指示。例如大电容负载接入导致的短期限流情况的发生。CXUS7743可以在芯片关断的时候阻断反向电流的发生。CXUS7743封装采用MSOP-8或SOP-8封装。The CXUS7743 incorporates dual 100mΩ P-channel MOSFET power switches for power-distribution systems that require multiple power switches in a single package. Each switch is controlled by a logic enable input. When either output load exceeds the current-limit threshold or a short is present, the device limits the outputs current to a safe level by switching into a constant-current limit mode with fold back, pulling the over-current (OCB(s)) logic output low. When continuous heavy overloads or short-circuits increase the power dissipation in the switches, causing the junction temperature to raise, a thermal protection circuit shutdown the switches to prevent damage. Internal Under Voltage Lock-Out (UVLO) circuitry ensures that the switches remain off until valid input voltage is present. Each power switch is designed to set current limit at 1A_typical for CXUS7743 and 2.5A_typical for CXUS7743-15 respectively. OCB(s) are open-drain outputs which are asserted when over-current 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 CXUS7743 eliminates any reversed current flow across each switch when it is powered off. The CXUS7743is available in MSOP-8 or SOP-8 package, operates over the extended (-40°C to +85°C) temperature range.

   产品特点 返回TOPosx嘉泰姆

osx嘉泰姆

• 双通道100 mΩ High-Side MOSFETosx嘉泰姆

• 1A限流电流，且具有fold-back功能osx嘉泰姆

• 工作电压范围:2.7V to 5.5Vosx嘉泰姆

• 300μs 输出电压上升时间osx嘉泰姆

• 欠压保护功能osx嘉泰姆

• 15μA 静态电流</p>

• 1μA 关断电流osx嘉泰姆

• 低电平逻辑使能控制osx嘉泰姆

• 芯片关断后没有反向电流</p>

• 具有延时功能的开漏输出限流指示信号</p>

• 8引脚SOP封装osx嘉泰姆

• 符合RoHS规范及Pb-Freeosx嘉泰姆

Dual 100m
High-Side MOSFETosx嘉泰姆

Operating Range:2.7V to 5.5Vosx嘉泰姆

300μS Typical Rise Timeosx嘉泰姆

Under voltage Lockoutosx嘉泰姆

15μA Quiescent Supply Currentosx嘉泰姆

1μA Shutdown Supply Currentosx嘉泰姆

Logic Level Enable Pin, Available withosx嘉泰姆

Active-Low Versionosx嘉泰姆

No Reverse Current when Power Offosx嘉泰姆

Open-Drain Over-Current Flag Outputs withosx嘉泰姆

fault-blankingosx嘉泰姆

Available in MSOP-8, SOP-8 and SOP-8(EP)osx嘉泰姆

Packagesosx嘉泰姆

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

Halogen-Freeosx嘉泰姆

UL Listed-File No. E33429osx嘉泰姆

   应用范围 返回TOPosx嘉泰姆

osx嘉泰姆

• High-Side 电源开关</p>

• USB 电源管理系统osx嘉泰姆

• USB主机和自供电的总线系统osx嘉泰姆

• USB总线供电系统osx嘉泰姆

• 热插拔电源分配系统</p>

• 电池充电系统osx嘉泰姆

• 短路保护系统
 osx嘉泰姆

High-Side Power Protection Switch
 osx嘉泰姆

USB Power Management
 osx嘉泰姆

USB Host and Self-Powered Bubs
 osx嘉泰姆

USB Bus-Powered Hubs
 osx嘉泰姆

Hot Plug-In Power Supplies
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Battery-Charger Circuits
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Short-Circuit Protectionsosx嘉泰姆

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