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LT1121IS8

更新时间： 2024-11-21 22:09:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
12页 271K
描述
Micropower Low Dropout Regulators with Shutdown

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中文翻译

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LT1121IS8 数据手册

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LT1121/LT1121-3.3/LT1121-5  
Micropower Low Dropout  
Regulators with Shutdown  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
■
■
■
■
■
■
■
■
■
■
The LT1121/LT1121-3.3/LT1121-5 are micropower low  
dropout regulators with shutdown. These devices are  
capable of supplying 150mA of output current with a  
dropout voltage of 0.4V. Designed for use in battery-  
powered systems, the low quiescent current, 30µA oper-  
ating and 16µA 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.  
0.4V Dropout Voltage  
150mA Output Current  
30µA Quiescent Current  
No Protection Diodes Needed  
Adjustable Output from 3.8V to 20V  
3.3V and 5V Fixed Output Voltages  
Controlled Quiescent Current in Dropout  
Shutdown  
16µA Quiescent Current in Shutdown  
Stable with 0.33µF Output Capacitor  
Reverse Battery Protection  
No Reverse Current with Input Low  
Thermal Limiting  
Other features of the LT1121/LT1121-3.3/LT1121-5 in-  
clude the ability to operate with very small output capaci-  
tors. 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, enhanc-  
ing manufacturability. 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 backup power situations where the output is held high  
and the input is at ground or reversed. Under these  
conditions only 16µA will flow from the output pin to  
ground.  
O U  
PPLICATI  
S
A
■
■
■
Low Current Regulator  
Regulator for Battery-Powered Systems  
Post Regulator for Switching Supplies  
U
O
TYPICAL APPLICATI  
Dropout Voltage  
5V Battery-Powered Supply with Shutdown  
0.5  
8
1
3.3V OUT  
150mA  
IN  
OUT  
LT1121-3.3  
0.4  
0.3  
0.2  
0.1  
0
+
1µF  
5V  
SOLID TANTALUM  
5
SHDN  
GND  
3
V
(PIN 5) OUTPUT  
< 0.25  
> 2.8  
SHDN  
OFF  
ON  
LT1121 • TA01  
NC  
ON  
80  
OUTPUT CURRENT (mA)  
0
20 40 60  
100 120 140 160  
LT1121 • TA02  
1
1234567...12

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