• [ CXUS7744 ]

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1.产品概述       2.产品特点     yPs嘉泰姆

3.应用范围       4.技术规格书下载（PDF文档）yPs嘉泰姆

5.产品封装       6.电路原理图  yPs嘉泰姆

7.相关产品yPs嘉泰姆

   产品概述 返回TOPyPs嘉泰姆

     CXUS7744是一种双通道的电源开关芯片，内部集成了两个95mΩ 的P型MOSFET功率管，每个通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)，CXUS7744的每个通道的限流电流设置典型值均在1A，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，切断功率通道以防止芯片损毁；另外，CXUS7744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。CXUS7744可以在芯片关断的时候阻断反向电流的发生。CXUS7744封装采用8引脚的SOP封装，工作温度范围是(-40℃to +85℃)。The CXUS7744 incorporates dual 95mΩ 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 typically. 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 CXUS7744 eliminates any reversed current flow across each switch when it is powered off. The ECXUS7744is available in 8-pin SOP package, operates over the extended (-40 to ℃ +85 ) temperature ℃ range.

   产品特点 返回TOPyPs嘉泰姆

• 双通道95 mΩ High-Side MOSFETyPs嘉泰姆

• 1A限流电流，且具有fold-back功能yPs嘉泰姆

• 工作电压范围:2.7V to 5.5VyPs嘉泰姆

• 300μs 输出电压上升时间yPs嘉泰姆

• 欠压保护功能yPs嘉泰姆

• 15μA 静态电流yPs嘉泰姆

• 1μA 关断电流yPs嘉泰姆

• 低电平逻辑使能控制yPs嘉泰姆

• 芯片关断后没有反向电流yPs嘉泰姆

• 具有延时功能的开漏输出限流指示信号yPs嘉泰姆

• SOP-8,SOP-8(EP)封装yPs嘉泰姆

• 符合RoHS规范及Pb-FreeyPs嘉泰姆

Dual 95m
High-Side MOSFETyPs嘉泰姆

1A (CXUS7744) Current Limits with Fold-backyPs嘉泰姆

1.5A (CXUS7744-15) Current Limits withyPs嘉泰姆

Fold-backyPs嘉泰姆

Operating Range:2.7V to 5.5VyPs嘉泰姆

300μS Typical Rise TimeyPs嘉泰姆

Under voltage LockoutyPs嘉泰姆

15μA Quiescent Supply CurrentyPs嘉泰姆

1μA Shutdown Supply CurrentyPs嘉泰姆

Logic Level Enable Pin, Available withyPs嘉泰姆

Active-Low VersionyPs嘉泰姆

No Reverse Current when Power OffyPs嘉泰姆

Open-Drain Over-Current Flag Outputs withyPs嘉泰姆

fault-blankingyPs嘉泰姆

Available in SOP-8 and SOP-8 (EP) PackagesyPs嘉泰姆

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

Halogen-FreeyPs嘉泰姆

   应用范围 返回TOPyPs嘉泰姆

• High-Side 电源开关yPs嘉泰姆

• USB 电源管理系统yPs嘉泰姆

• USB主机和自供电的总线系统yPs嘉泰姆

• USB总线供电系统yPs嘉泰姆

• 热插拔电源分配系统yPs嘉泰姆

• 电池充电系统yPs嘉泰姆

• 短路保护系统yPs嘉泰姆

High-Side Power Protection SwitchyPs嘉泰姆

USB Power ManagementyPs嘉泰姆

USB Host and Self-Powered BubsyPs嘉泰姆

USB Bus-Powered HubsyPs嘉泰姆

Hot Plug-In Power SuppliesyPs嘉泰姆

Battery-Charger CircuitsyPs嘉泰姆

Short-Circuit ProtectionsyPs嘉泰姆

   技术规格书（产品PDF) 返回TOP yPs嘉泰姆

     需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！yPs嘉泰姆

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产品封装图 返回TOPyPs嘉泰姆

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电路原理图 返回TOPyPs嘉泰姆

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◀ 上一篇:限流指示功能双通道电源开关CXUS7743两个100mΩ的P型MOSFET功率管每个信通道各有逻辑使能控制信号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

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下一篇▶:单通道的USB电源开关CXUS7745内部集成一个100mΩ的P型MOSFET功率管USB电源系统当输出负载过重短路时芯片会进入限流保护模式会拉低限流指示信号OC

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