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LT1521CST-5 PDF预览

LT1521CST-5

更新时间： 2024-11-21 22:55:51
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 298K
描述
300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

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LT1521CST-5 数据手册

 浏览型号LT1521CST-5的Datasheet PDF文件第2页浏览型号LT1521CST-5的Datasheet PDF文件第3页浏览型号LT1521CST-5的Datasheet PDF文件第4页浏览型号LT1521CST-5的Datasheet PDF文件第5页浏览型号LT1521CST-5的Datasheet PDF文件第6页浏览型号LT1521CST-5的Datasheet PDF文件第7页 
LT1521/LT1521-3  
LT1521-3.3/LT1521-5  
300mA Low Dropout  
Regulators with Micropower  
Quiescent Current and Shutdown  
U
FEATURES  
DESCRIPTION  
The LT®1521/LT1521-3/LT1521-3.3/LT1521-5 are low  
dropout regulators with micropower quiescent current  
and shutdown. These devices are capable of supplying  
300mA of output current with a dropout voltage of 0.5V.  
Designed for use in battery-powered systems, the low  
quiescent current, 12µA operating and 6µA in  
shutdown, makes them an ideal choice. The quiescent  
current is well controlled; it does not rise in dropout as it  
does with many other low dropout PNP regulators.  
■
Dropout Voltage: 0.5V  
Output Current: 300mA  
Quiescent Current: 12µA  
■
■
■
■
■
■
■
■
■
■
No Protection Diodes Needed  
Adjustable Output from 3.8V to 20V  
Fixed Output Voltages: 3V, 3.3V, 5V  
Controlled Quiescent Current in Dropout  
Shutdown IQ = 6µA  
Reverse Battery Protection  
No Reverse Current  
Other features of the LT1521/LT1521-3/LT1521-3.3/  
LT1521-5 include the ability to operate with very small  
output capacitors. They are stable with only 1.5µF on the  
outputwhilemostolderdevicesrequirebetween10µFand  
100µF for stability. Small ceramic capacitors can be used,  
enhancing manufacturability. Also, the input may be con-  
nectedtovoltageslowerthantheoutputvoltage,including  
negative voltages, without reverse current flow from out-  
puttoinput.ThismakestheLT1521seriesidealforbackup  
power situations where the output is held high and the  
input is low or reversed. Under these conditions only 5µA  
will flow from the output pin to ground.  
Thermal Limiting  
U
APPLICATIONS  
■
Low Current Regulator  
■
Regulator for Battery-Powered Systems  
■
Post Regulator for Switching Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Dropout Voltage  
5V Battery-Powered Supply with Shutdown  
0.6  
5V  
300mA  
8
1
IN  
OUT  
0.5  
+
6V  
1µF  
1.5µF  
LT1521-5  
0.4  
5
2
SHDN  
SENSE  
GND  
3
0.3  
0.2  
0.1  
V
(PIN 5) OUTPUT  
SHDN  
<0.25  
>2.80  
NC  
OFF  
ON  
ON  
LT1521 • TA01  
0
0
100  
150  
200  
250  
300  
50  
OUTPUT CURRENT (mA)  
LT1521 • TA02  
1
1234567...16

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