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MAX4981ETA+ PDF预览

MAX4981ETA+

更新时间： 2024-11-10 04:46:07
品牌 Logo 应用领域
美信 - MAXIM 信息通信管理光电二极管
页数 文件大小 规格书
10页 160K
描述
Surge Protection Circuit, BICMOS, PDSO8, 2 X 3 MM, LEAD FREE, TDFN-8

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MAX4981ETA+ 数据手册

 浏览型号MAX4981ETA+的Datasheet PDF文件第2页浏览型号MAX4981ETA+的Datasheet PDF文件第3页浏览型号MAX4981ETA+的Datasheet PDF文件第4页浏览型号MAX4981ETA+的Datasheet PDF文件第5页浏览型号MAX4981ETA+的Datasheet PDF文件第6页浏览型号MAX4981ETA+的Datasheet PDF文件第7页 
19-4137; Rev 0; 5/08  
Overvoltage Protector with  
Active Current Limit  
7–MAX4981  
General Description  
Features  
♦ Input Voltage Protection Up to +28V  
♦ Integrated nFET Switch, 85mΩ (typ)  
The MAX4978–MAX4981 overvoltage-protection devices  
protect low-voltage systems against voltage faults up to  
+28V and feature a low 85mΩ R  
FET, an active cur-  
ON  
♦ Preset Overvoltage Protection Trip Level  
5.7V (typ) (MAX4978/MAX4980/MAX4981)  
6.8V (typ) (MAX4979)  
♦ Low-Current Undervoltage Lockout Mode  
♦ Overcurrent Protection  
rent limiter, and lithium-ion battery overcharge protec-  
tion (MAX4980/MAX4981). These devices are used to  
protect the charger input port on a portable device.  
The overvoltage protector feature protects against volt-  
ages up to 28V with two different trip thresholds: 5.7V  
(MAX4978/MAX4980/MAX4981) and 6.8V (MAX4979).  
There is an undervoltage protector with two different trip  
thresholds: 4.4V (MAX4978) and 2.63V (MAX4979/  
MAX4980/MAX4981).  
♦ Internal 160ms (typ) Startup Delay  
♦ Thermal-Shutdown Protection  
♦ Battery Overcharge Protection  
(MAX4980/MAX4981)  
♦ Startup Debounce Time Indicator  
The overcurrent limiter and battery voltage monitor fea-  
tures provide a second layer of protection for a lithium-  
ion battery charger. The overcurrent limiter is available  
in two different thresholds: 0.9A (MAX4978/MAX4979/  
MAX4980) and 1.95A (MAX4981). Once current reach-  
es the threshold, it is held for a 20ms blanking time. If  
the current is still at the limit after the blanking time, the  
FET is turned off, and the device restarts the cycle after  
160ms. The battery voltage monitor measures the volt-  
age of a lithium-ion battery and disables the FET if the  
battery voltage reaches 4.4V (MAX4980/MAX4981).  
(MAX4978/MAX4979)  
♦ Small, 8-Pin (2mm x 3mm) TDFN Package  
Pin Configuration  
TOP VIEW  
OUT I.C.  
I.C. GND  
8
7
6
5
The MAX4978–MAX4981 are available in a small 8-pin  
TDFN (2mm x 3mm) package and are specified over  
the extended -40°C to +85°C temperature range.  
MAX4978  
MAX4979  
MAX4980  
MAX4981  
Applications  
*EP  
Cell Phones  
PDAs and Palmtop  
Devices  
MP3 Players  
1
2
3
4
Digital Still Cameras  
SDT(BAT)  
IN  
I.C.  
EN  
TDFN-EP  
(BAT) IS FOR MAX4980/MAX4981 ONLY.  
*EP = EXPOSED PAD. CONNECT EP TO GND.  
Typical Application Circuit appears at end of data sheet.  
Ordering Information/Selector Guide  
CURRENT  
LIMIT (mA)  
BATTERY  
MONITOR  
UVLO  
(V)  
OVLO  
(V)  
TOP  
MARK  
PKG  
CODE  
PART  
PIN-PACKAGE  
8 TDFN-EP*  
8 TDFN-EP*  
8 TDFN-EP*  
8 TDFN-EP*  
MAX4978ETA+  
MAX4979ETA+**  
MAX4980ETA+  
MAX4981ETA+  
900  
900  
No  
No  
4.4  
5.7  
6.8  
5.7  
5.7  
AAK  
AAL  
AAM  
AAN  
T823-1  
T823-1  
T823-1  
T823-1  
2.63  
2.63  
2.63  
900  
Yes  
Yes  
1950  
Note: All devices specified over the -40°C to +85°C operating temperature range.  
+Denotes a lead-free package.  
*EP = Exposed pad.  
**Future product—contact factory for availability.  
________________________________________________________________ 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.  
1234567...10

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