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MIC2526

更新时间： 2024-09-19 22:54:51
品牌 Logo 应用领域
麦瑞 - MICREL 开关
页数 文件大小 规格书
12页 97K
描述
Dual USB Power Control Switch Not Recommended for New Designs

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中文翻译

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MIC2526 数据手册

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MIC2526  
Dual USB Power Control Switch  
Not Recommended for New Designs  
Refer to MIC2026  
General Description  
Features  
TheMIC2526isadualintegratedhigh-sidepowerswitchwith  
independent enable and flag functions, optimized for self-  
powered and bus-powered Universal Serial Bus (USB) appli-  
cations. Few external components are necessary to satisfy  
USB requirements.  
• Compliant to USB specifications  
• UL Recognized Component  
• 2 independent switches  
• 3V to 5.5V input  
• 500mA minimum continuous load current per port  
• 140mΩ maximum on-resistance  
• 1.25A maximum short circuit current limit  
• Individual open-drain fault flag pins  
• 110µA typical on-state supply current  
• 1µA typical off-state supply current  
• Output can be forced higher than input (off-state)  
• Thermal shutdown  
• 2.4V typical undervoltage lockout (UVLO)  
• 1ms turn-on (soft-start) and fast turnoff  
• Active-high or active-low enable versions  
• 8-pin SOIC and DIP packages  
TheMIC2526satisfiesthefollowingUSBrequirements:each  
switch channel supplies up to 500mA as required by USB  
downstream devices; the switch’s low on-resistance meets  
USB voltage drop requirements; fault current is limited to  
typically 750mA, well below the UL 25VA safety require-  
ments; and a flag output is available to indicate fault condi-  
tions to the local USB controller. Soft start eliminates the  
momentaryvoltagedropontheupstreamportthatmayoccur  
when the switch is enabled in bus-powered applications.  
Additional features include thermal shutdown to prevent  
catastrophic switch failure from high-current loads,  
undervoltage lockout (UVLO) to ensure that the device re-  
mains off unless there is a valid input voltage present, and  
3.3V and 5V logic compatible enable inputs.  
Applications  
• USB host and self-powered hubs  
• USB bus-powered hubs  
The MIC2526 is available in active-high and active-low ver-  
sions in 8-pin DIP and SOIC packages.  
• Hot plug-in power supplies  
• Battery-charger circuits  
Typical Application  
VCC  
5.0V  
Ferrite  
Beads  
10k  
100k  
4.50V to 5.25V  
Upstream VBUS  
100mA max.  
10k  
VBUS  
D+  
100k  
3.3V USB Controller  
MIC2526-2  
MIC5207-3.3  
IN OUT  
USB  
Port 1  
D–  
VBUS  
D+  
47µF  
0.1µF  
VIN  
ON/OFF  
ENA  
OUTA  
IN  
GND  
OVERCURRENT  
OVERCURRENT  
ON/OFF  
FLGA  
FLGB  
ENB  
1µF  
1µF  
D–  
GND  
GND  
OUTB  
VBUS  
D+  
GND  
USB  
Port 2  
D–  
47µF  
GND  
Data  
Data  
(Two Pair)  
to USB  
Controller  
2-Port USB Self-Powered Hub  
UL Recognized Component  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
February 2000  
1
MIC2526  
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