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Image LM2940
型号: LM2940
厂商: Texas Instruments Texas Instruments
标准:
分类: 集成电路
描述: 1A low dropout regulator
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January 2003  
LM2940/LM2940C  
1A Low Dropout Regulator  
General Description  
momentarily exceed the specified maximum operating volt-  
age, the regulator will automatically shut down to protect  
both the internal circuits and the load. The LM2940/  
LM2940C cannot be harmed by temporary mirror-image in-  
sertion. Familiar regulator features such as short circuit and  
thermal overload protection are also provided.  
The LM2940/LM2940C positive voltage regulator features  
the ability to source 1A of output current with a dropout  
voltage of typically 0.5V and a maximum of 1V over the  
entire temperature range. Furthermore, a quiescent current  
reduction circuit has been included which reduces the  
ground current when the differential between the input volt-  
age and the output voltage exceeds approximately 3V. The  
quiescent current with 1A of output current and an input-  
output differential of 5V is therefore only 30 mA. Higher  
quiescent currents only exist when the regulator is in the  
dropout mode (VIN ? VOUT 3V).  
Features  
@
n Dropout voltage typically 0.5V IO = 1A  
n Output current in excess of 1A  
n Output voltage trimmed before assembly  
n Reverse battery protection  
Designed also for vehicular applications, the LM2940/  
LM2940C and all regulated circuitry are protected from re-  
verse battery installations or 2-battery jumps. During line  
transients, such as load dump when the input voltage can  
n Internal short circuit current limit  
n Mirror image insertion protection  
n P+ Product Enhancement tested  
Typical Application  
00882203  
*
Required if regulator is located far from power supply filter.  
**  
C
must be at least 22 μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible  
OUT  
to the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.  
Ordering Information  
Temperature  
Range  
Output Voltage  
9.0  
Package  
5.0  
8.0  
10  
12  
15  
0?C TJ 125?C LM2940CT-5.0  
LM2940CT-9.0  
LM2940CS-9.0  
LM2940CT-12  
LM2940CS-12  
LM2940CT-15  
LM2940CS-15  
LM2940LD-15  
TO-220  
TO-263  
LM2940CS-5.0  
?40?C TJ  
LM2940LD-5.0  
LM2940LD-8.0 LM2940LD-9.0  
LM2940LD-10 LM2940LD-12  
LLP 1k  
Units  
Tape and  
Reel  
125?C  
LM2940LDX-5.0  
LM2940LDX-8.0 LM2940LDX-9.0  
LM2940LDX-10 LM2940LDX-12 LM2940LDX-15  
LLP 4.5k  
Units  
Tape and  
Reel  
?40?C TJ  
LM2940T-5.0  
LM2940S-5.0  
LM2940T-8.0  
LM2940S-8.0  
LM2940T-9.0  
LM2940S-9.0  
LM2940T-10  
LM2940S-10  
LM2940T-12  
LM2940S-12  
TO-220  
125?C  
TO-263  
?40?C TJ  
LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 LM2940IMP-15  
SOT-223  
85?C  
LM2940IMPX-5.0 LM2940IMPX-8.0 LM2940IMPX-9.0 LM2940IMPX-10 LM2940IMPX-12 LM2940IMPX-15 SOT-223  
in Tape  
and Reel  
SOT-223  
Package Marking  
L53B  
L54B  
L0EB  
L55B  
L56B  
L70B  
The physical size of the SOT-223 is too small to contain the full device part number. The package markings indicated are what will appear on the actual device.  
? 2003 National Semiconductor Corporation  
DS008822  
www.national.com  
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