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LT1185

更新时间： 2024-11-22 22:55:47
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 215K
描述
Low Dropout Regulator

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中文翻译

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LT1185 数据手册

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LT1185  
Low Dropout Regulator  
EATURE  
Low Resistance Pass Transistor: 0.25Ω  
Dropout Voltage: 0.75V at 3A  
±1% Reference Voltage  
Accurate Programmable Current Limit  
Shutdown Capability  
Internal Reference Available  
Standard 5-Lead Packages  
Full Remote Sense  
Low Quiescent Current: ≈2.5mA  
Good High Frequency Ripple Rejection  
S
F
■
■
■
■
■
■
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The LT1185 uses a saturation-limited NPN transistor as  
the pass element. This device gives the linear dropout  
characteristics of an FET pass element with significantly  
lessdiearea.Highefficiencyismaintainedbyusingspecial  
anti-saturation circuitry that adjusts base drive to track  
load current. The “on resistance” is typically 0.25Ω.  
Accurate current limit is programmed with a single 1/8W  
external resistor, with a range of zero to three amperes. A  
second, fixed internal limit circuit prevents destructive  
currents if the programming current is accidentally over-  
ranged. Shutdown of the regulator output is guaranteed  
when the program current is less than 1µA, allowing  
external logic control of output voltage.  
U
DESCRIPTIO  
TheLT®1185isa3Alowdropoutregulatorwithadjustable  
currentlimitandremotesensecapability. Itcanbeusedas  
a positive output regulator with floating input or as a  
standard negative regulator with grounded input. The  
outputvoltagerangeis2.5Vto25V,with±1%accuracyon  
the internal reference voltage.  
TheLT1185hasalltheprotectionfeaturesofpreviousLTC  
regulators, including power limiting and thermal shut-  
down. The 4-lead TO-3 package is specified for –55°C to  
150°C operation and the 5-lead TO-220 is specified over  
0°C to 125°C.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
5V, 3A Regulator with 3.5A Current Limit  
Dropout Voltage  
+
+
1.6  
1.4  
1.2  
1.0  
+
C2  
R
*
R1  
LIM  
2µF  
4.3k  
2.37k  
TANT  
V
IN  
6V TO 16V  
REF  
GND  
+
C1  
2µF  
TANT  
V
OUT  
5V AT 3A  
FB  
T
= 25°C  
J
0.8  
0.6  
0.4  
0.2  
0
R2  
2.67k  
T
1
= 125°C  
LT1185  
J
V
–
IN  
V
–
OUT  
LT1185 • TA01  
T
= –55°C  
J
*CURRENT LIMIT = 15k/R  
= 3.5A  
LIM  
2
0
3
4
LOAD CURRENT (A)  
LT1185 • TA02  
1
1234567...16

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