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MAX14544

更新时间： 2024-11-09 05:49:03
品牌 Logo 应用领域
美信 - MAXIM 开关
页数 文件大小 规格书
10页 1139K
描述
28V-Capable, ILIM VBUS Accessory Switch

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MAX14544 数据手册

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19-5037; Rev 0; 1/10  
28V-Capable, I V  
Accessory Switch  
LIM BUS  
General Description  
Features  
The MAX14544/MAX14545 are overcurrent detection  
switches that can provide power to external accesso-  
ries while preventing the host device from damage due  
to faulty overload conditions. These analog switches  
feature a 270mω (typ) on-resistance and operate from  
a +2.3V to +5.5V input voltage range. The selectable  
current limit of 200mA or 400mA makes them ideal for  
load-switching applications.  
S 200mA or 400mA Selectable Current Limit  
S Output Capable of Withstanding +28V  
S Reverse-Current Shutdown Protection  
S +2.3V to +5.5V Input Operation Range  
S Undervoltage Lockout  
S Autoretry or Latchoff Option  
S Thermal Shutdown Protection  
The MAX14544 has an autoretry feature, whereas the  
MAX14545 has a latchoff feature. When the switch is off,  
OUT can withstand 28V maximum. When the switch is on  
and a load is connected to the port, a blanking time of  
10.5ms ensures that the transient voltage settles down.  
After this blanking time, if the voltage across the switch is  
greater than the FLAG assertion voltage, the switch turns  
off and then a FLAG is issued to the microprocessor.  
After the retry time, the device recloses for the duration  
of the blanking time to check if the load current is lower  
than the limit. The MAX14544 repeats this cycle if the  
overload condition is present. During the cycle, FLAG  
remains asserted. The MAX14544 remains on after the  
overload condition is removed and FLAG deasserts. For  
the MAX14545, after the blanking time, the switch turns  
off and then a FLAG is issued to the microprocessor. The  
switch can be turned on again by cycling the power or  
the EN input.  
S 0.1µA (typ) Shutdown Current  
S 5µs Fast Current-Limit Detect  
S 8-Pin TDFN (2mm x 2mm) Package  
S -40NC to +85NC Operating Temperature Range  
Ordering Information/  
Selector Guide  
PIN-  
PACKAGE  
TOP  
RETRY/  
PART  
MARK LATCHOFF  
MAX14544ETA+T  
MAX14545ETA+T  
8 TDFN-EP*  
8 TDFN-EP*  
ACY  
ACZ  
Autoretry  
Latchoff  
Note: All devices are specified over the -40°C to +85°C tem-  
perature range.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
*EP = Exposed pad.  
The MAX14544/MAX14545 have additional safety fea-  
tures that include thermal shutdown protection, reverse-  
current blocking, and overvoltage protection.  
Pin Configuration  
The MAX14544/MAX14545 are offered in a space-sav-  
ing, 8-pin, 2mm x 2mm TDFN package, and operate over  
the -40NC to +85NC extended temperature range.  
TOP VIEW  
+
Applications  
IN  
IN  
1
2
3
4
8
7
6
5
OUT  
OUT  
EN  
Cell Phones  
MP3 Players  
PDAs  
MAX14544  
MAX14545  
ISET  
GND  
Digital Cameras  
eBook  
*EP  
FLAG  
MID  
TDFN  
Typical Operating Circuit appears at end of data sheet.  
*CONNECT EXPOSED PAD TO GND.  
_______________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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