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MAX4842

更新时间： 2024-11-13 00:04:19
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美信 - MAXIM 电池
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MAX4842 数据手册

 浏览型号MAX4842的Datasheet PDF文件第2页浏览型号MAX4842的Datasheet PDF文件第3页浏览型号MAX4842的Datasheet PDF文件第4页浏览型号MAX4842的Datasheet PDF文件第5页浏览型号MAX4842的Datasheet PDF文件第6页浏览型号MAX4842的Datasheet PDF文件第7页 
19-3044; Rev 1; 4/04  
Overvoltage Protection Controllers with  
Status FLAG  
General Description  
Features  
The MAX4838–MAX4842 are overvoltage protection ICs  
that protect low-voltage systems against voltages of up  
to 28V. If the input voltage exceeds the overvoltage trip  
level, the MAX4838–MAX4842 turn off the low-cost  
external n-channel FET(s) to prevent damage to the  
protected components. An internal charge pump elimi-  
nates the need for external capacitors and drives the  
FET gate for a simple, robust solution.  
♦ Overvoltage Protection Up to 28V  
♦ Preset 7.4V, 5.8V, or 4.7V Overvoltage Trip Level  
♦ Drive Low-Cost NMOS FET  
♦ Internal 50ms Startup Delay  
♦ Internal Charge Pump  
♦ Undervoltage Lockout  
The MAX4838/MAX4839 have a 7.4V overvoltage  
threshold, and the MAX4840/MAX4841 have a 5.8V  
overvoltage threshold. The MAX4842 has a 4.7V over-  
voltage threshold. The MAX4838–MAX4841 have an  
undervoltage lockout (UVLO) threshold of 3.25V while  
the MAX4842 has a UVLO of 3.0V. In addition to the  
single FET configuration, the devices can be config-  
ured with back-to-back external FETs to prevent cur-  
rents from being back-driven into the adapter.  
♦ 15kV ESD-Protected Input  
♦ Voltage Fault FLAG Indicator  
♦ 6-Pin SC70 Package  
Ordering Information  
On power-up, the device waits for 50ms before driving  
GATE high. FLAG is held low for an additional 50ms  
after GATE goes high before deasserting. The  
MAX4838/MAX4840/MAX4842 have an open-drain  
FLAG output, and the MAX4839/MAX4841 have a push-  
pull FLAG output. The FLAG output asserts immediately  
to an overvoltage fault.  
PIN-  
PACKAGE  
TOP  
MARK  
PART  
TEMP RANGE  
MAX4838EXT-T  
MAX4839EXT-T  
MAX4840EXT-T  
MAX4841EXT-T  
MAX4842EXT-T  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
6 SC70-6  
6 SC70-6  
6 SC70-6  
6 SC70-6  
6 SC70-6  
ABW  
ABY  
ABX  
ABZ  
ACE  
Additional features include a 15kV ESD-protected input  
(when bypassed with a 1µF capacitor) and a shutdown  
pin (EN) to turn off the device (MAX4838/MAX4840/  
MAX4842).  
All devices are offered in a small 6-pin SC70 package  
and are specified for operation from -40°C to +85°C.  
Typical Operating Circuit  
Applications  
Cell Phones  
INPUT  
OUTPUT  
NMOS  
Digital Still Cameras  
PDAs and Palmtop Devices  
MP3 Players  
+1.2V TO +28V  
1
4
3
IN  
GATE  
V
IO  
Selector Guide  
1µF  
MAX4838–  
MAX4842  
OV  
UVLO  
THRESHOLD  
(V)  
TRIP  
LEVEL  
(V)  
EN  
FLAG  
PART  
6
2
INPUT OUTPUT  
EN  
FLAG  
NOTE: EN AND PULLUP  
RESISTOR ON MAX4838/  
MAX4840/MAX4842 ONLY.  
GND  
MAX4838EXT-T  
MAX4839EXT-T  
MAX4840EXT-T  
MAX4841EXT-T  
MAX4842EXT-T  
3.25  
3.25  
3.25  
3.25  
3.00  
7.4  
7.4  
5.8  
5.8  
4.7  
Yes Open-Drain  
No  
Yes Open-Drain  
No Push-Pull  
Yes Open-Drain  
Push-Pull  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...10

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