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LT1239_02

更新时间： 2024-11-22 04:43:51
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
12页 236K
描述
Backup Battery Management Circuit

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中文翻译

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LT1239_02 数据手册

 浏览型号LT1239_02的Datasheet PDF文件第2页浏览型号LT1239_02的Datasheet PDF文件第3页浏览型号LT1239_02的Datasheet PDF文件第4页浏览型号LT1239_02的Datasheet PDF文件第5页浏览型号LT1239_02的Datasheet PDF文件第6页浏览型号LT1239_02的Datasheet PDF文件第7页 
LT1239  
Backup Battery  
Management Circuit  
OBSOLETE:  
Contact Linear Technology for Potential Replacement  
FOR INFORMATION PURPOSES ONLY  
U
FEATURES  
DESCRIPTION  
The LT® 1239 is a micropower backup battery manage-  
ment system for portable computers and instrumenta-  
tion. It contains two regulators for regulating the battery  
voltage and memory voltage and a comparator for switch-  
ing between main power and backup power. The first  
regulator provides a constant voltage charge for the  
backup batteries and is adjustable from 3.75V up to 20V.  
An equalization amplifier combined with the first regulator  
provides precision charge equalization for a 2-cell  
lithium-ion system. A second regulator with 4.85V output  
providesaregulatedbackupbatteryvoltagetothememory  
when main power is lost. The second regulator also  
isolates the backup battery from the main 5V supply  
during normal operation when the memory is being pow-  
ered by the 5V supply.  
I
Micropower Operation (IQ = 20  
µA)  
I
I
I
I
I
I
I
I
I
I
I
Adjustable Regulator for Battery Charging  
4.85V Regulator for Battery Regulation  
Cell Voltage Equalization in 2-Cell Systems  
Low-Battery Detector Protects Lithium Cells  
Comparator for Automatic Power Switching  
Shutdown  
Output Current Sensing  
Current and Thermal Limiting  
Reverse Output Protection  
16-Pin SO Package  
Operates on 7V to 30V Input  
U
APPLICATIONS  
I
Backup Battery Management Systems for Portable  
A comparator is included which provides automatic  
switchover from main 5V power to backup power ensur-  
ing uninterrupted power for memory and power monitor-  
Computers  
I
Lithium-Ion Backup Systems  
I
NiCd Backup Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Lithium-Ion Backup System  
120Ω* 120Ω*  
10  
INPUT 2  
OUT 1  
ADJ  
+
604k  
1%  
300pF  
16  
1
22µF  
INPUT 1  
REGULATOR  
#1  
14  
3
MAIN  
BATTERY  
PACK  
+
22µF  
I
69.8k  
1%  
MON1  
SHDN1  
15  
7
7V TO 24V  
3.4V  
Li-Ion  
CELL  
E/A (IN)  
681k  
1%  
INPUT 2  
–
IN  
GND  
2
4
5
8
LOW-BATTERY  
DETECT  
E/A (OUT)  
+
3.4V  
Li-Ion  
CELL  
GND  
GND  
GND  
5V  
IN  
5V SYSTEM  
POWER  
13  
INPUT 1  
+
–
OUT  
GND  
IN  
REGULATOR  
#2  
OUT 2  
12  
SHDN2  
6
* REQUIRED BY SOME SAFETY AGENCIES  
SEE APPLICATIONS INFORMATION  
FOR INFORMATION ON  
I
MON2  
POWER  
MANAGEMENT  
MEMORY  
11  
SELECTING VALUES.  
LTC1239 • TA01  
1
1234567...12

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