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℃)。
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产品概述 返回TOP
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TOP
• 双通道95 mΩ High-Side MOSFET
• 1A限流电流，且具有fold-back功能
• 工作电压范围:2.7V to 5.5V
• 300μs 输出电压上升时间
• 欠压保护功能
• 15μA 静态电流
• 1μA 关断电流
• 低电平逻辑使能控制
• 芯片关断后没有反向电流
• 具有延时功能的开漏输出限流指示信号
• SOP-8,SOP-8(EP)封装
• 符合RoHS规范及Pb-Free
Dual 95m High-Side MOSFET
1A (CXUS7744) Current Limits with Fold-back
1.5A (CXUS7744-15) Current Limits with
Fold-back
Operating Range:2.7V to 5.5V
300μS Typical Rise Time
Under voltage Lockout
15μA Quiescent Supply Current
1μA Shutdown Supply Current
Logic Level Enable Pin, Available with
Active-Low Version
No Reverse Current when Power Off
Open-Drain Over-Current Flag Outputs with
fault-blanking
Available in SOP-8 and SOP-8 (EP) Packages
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
应用范围 返回TOP
• High-Side 电源开关
• USB 电源管理系统
• USB主机和自供电的总线系统
• USB总线供电系统
• 热插拔电源分配系统
• 电池充电系统
• 短路保护系统
High-Side Power Protection Switch
USB Power Management
USB Host and Self-Powered Bubs
USB Bus-Powered Hubs
Hot Plug-In Power Supplies
Battery-Charger Circuits
Short-Circuit Protections
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产品封装图 返回TOP
电路原理图 返回TOP
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功率开关 > USB开关 |
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|
Part Number |
remark |
Channel |
Vin (V) |
RDS(ON) |
ILMT |
Enable |
Fault Flag |
IQ(A) |
Package |
|
Dual Power-Distribution Switch with Fault-Blanking |
2 |
2.7~5.5 |
100mΩ |
1A |
Active Low |
Yes |
13μA |
SOP-8 |
|
|
Dual Power-Distribution Switch with Fault-Blanking |
2 |
2.7~5.5 |
95mΩ |
1A |
Active Low |
Yes |
13μA |
SOP-8, SOP-8(EP) |
|
|
USB Power-Distribution Switch with Fault Blanking |
1 |
2.7 ~ 5.5 |
100mΩ |
1.5A/2A /2.5A |
Active Low/Active High |
Yes |
11μA |
SOT23-5,MSOP-8,MSOP-8(EP) |
|
|
USB Power-Distribution Switch with Fault Blanking |
1 |
2.7~5.5 |
80mΩ |
1.5A |
Active High |
Yes |
11μA |
SOT23-5 |
|
