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LT1121CST-3.3#TR PDF预览

LT1121CST-3.3#TR

更新时间： 2024-11-23 06:22:27
品牌 Logo 应用领域
凌特 - Linear 光电二极管
页数 文件大小 规格书
16页 264K
描述
Fixed Positive LDO Regulator, 3.3V, 0.7V Dropout, BIPolar, PDSO4

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LT1121CST-3.3#TR 数据手册

 浏览型号LT1121CST-3.3#TR的Datasheet PDF文件第2页浏览型号LT1121CST-3.3#TR的Datasheet PDF文件第3页浏览型号LT1121CST-3.3#TR的Datasheet PDF文件第4页浏览型号LT1121CST-3.3#TR的Datasheet PDF文件第5页浏览型号LT1121CST-3.3#TR的Datasheet PDF文件第6页浏览型号LT1121CST-3.3#TR的Datasheet PDF文件第7页 
LT1121/LT1121-3.3/LT1121-5  
Micropower Low Dropout  
Regulators with Shutdown  
FEATURES  
DESCRIPTION  
The LT®1121/LT1121-3.3/LT1121-5 are micropower low  
dropout regulators with shutdown. These devices are ca-  
pableofsupplying150mAofoutputcurrentwithadropout  
voltage of 0.4V. Designed for use in battery-powered sys-  
tems, thelowquiescentcurrent, 30µAoperatingand16µA  
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.  
n
0.4V Dropout Voltage  
n
150mA Output Current  
n
30µA Quiescent Current  
No Protection Diodes Needed  
n
n
Adjustable Output from 3.75V to 30V  
n
3.3V and 5V Fixed Output Voltages  
n
Controlled Quiescent Current in Dropout  
n
Shutdown  
n
16µA Quiescent Current in Shutdown  
OtherfeaturesoftheLT1121/LT1121-3.3/LT1121-5include  
the ability to operate with very small output capacitors.  
They are stable with only 0.33µF on the output while most  
older devices require between 1µF and 100µF for stability.  
Small ceramic capacitors can be used, enhancing manu-  
facturability. Also the input may be connected to ground  
or a reverse voltage without reverse current flow from  
output to input. This makes the LT1121 series ideal for  
backuppowersituationswheretheoutputisheldhighand  
the input is at ground or reversed. Under these conditions  
only 16µA will flow from the output pin to ground.  
n
Stable with 0.33µF Output Capacitor  
n
Reverse Battery Protection  
ꢀ
n
n
n
No Reverse Current with Input Low  
Thermal Limiting  
Available in the 8-Lead SO, 8-Lead PDIP, 3-Lead  
SOT-23 and 3-Lead TO-92 Packages  
APPLICATIONS  
n
Low Current Regulator  
n
Regulator for Battery-Powered Systems  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
n
Post Regulator for Switching Supplies  
TYPICAL APPLICATION  
5V Battery-Powered Supply with Shutdown  
Dropout Voltage  
0.5  
8
1
3.3V  
OUT  
IN  
OUT  
LT1121-3.3  
150mA  
0.4  
0.3  
0.2  
0.1  
0
+
1μF  
5V  
SOLID TANTALUM  
5
SHDN  
GND  
3
V
(PIN 5) OUTPUT  
SHDN  
<0.25  
>2.8  
NC  
OFF  
ON  
ON  
LT1121 • TA01  
80  
OUTPUT CURRENT (mA)  
0
20 40 60  
100 120 140 160  
LT1121 • TA02  
1121fg  
1
1234567...16

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