LM2940/LM2940C 1A Low Dropout Regulator
March 2000
LM2940/LM2940C
1A Low Dropout Regulator
General Description
The LM2940/LM2940C positive voltage regulator features
the ability to source 1A of output current with a dropout volt-
age of typically 0.5V and a maximum of 1V over the entire
temperature range. Furthermore, a quiescent current reduc-
tion circuit has been included which reduces the ground cur-
rent when the differential between the input voltage and the
output voltage exceeds approximately 3V. The quiescent
current with 1A of output current and an input-output differ-
ential of 5V is therefore only 30 mA. Higher quiescent cur-
rents only exist when the regulator is in the dropout mode
(V
IN
鈭?V
OUT
鈮?/div>
3V).
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
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.
Features
n
n
n
n
n
n
n
Dropout voltage typically 0.5V
@
I
O
= 1A
Output current in excess of 1A
Output voltage trimmed before assembly
Reverse battery protection
Internal short circuit current limit
Mirror image insertion protection
P
+
Product Enhancement tested
Typical Application
DS008822-3
to the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.
*
Required if regulator is located far from power supply filter.
**
C
OUT
must be at least 22 碌F to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible
Ordering Information
Temperature
Range
0藲C
鈮?/div>
T
J
鈮?/div>
125藲C
鈭?0藲C
鈮?/div>
T
J
鈮?/div>
125藲C
鈭?0藲C
鈮?/div>
T
J
鈮?/div>
85藲C
Output Voltage
5.0
LM2940CT-5.0
LM2940CS-5.0
LM2940T-5.0
LM2940S-5.0
LM2940IMP-5.0
LM2940T-8.0
LM2940S-8.0
LM2940IMP-8.0
8.0
9.0
LM2940CT-9.0
LM2940CS-9.0
LM2940T-9.0
LM2940S-9.0
LM2940IMP-9.0
LM2940T-10
LM2940S-10
LM2940IMP-10
10
12
LM2940CT-12
LM2940CS-12
LM2940T-12
LM2940S-12
LM2940IMP-12
LM2940IMP-15
15
LM2940CT-15
LM2940CS-15
Package
TO-220
TO-263
TO-220
TO-263
SOT-223
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.
Temperature
Range
鈭?5藲C
鈮?/div>
T
J
鈮?/div>
125藲C
Output Voltage
5.0
LM2940J-5.0/883
5962-8958701EA
LM2940WG5.0/883
5962-8958701XA
8.0
LM2940J-8.0/883
5962-9088301QEA
12
LM2940J-12/883
5962-9088401QEA
15
LM2940J-15/883
5962-9088501QEA
Package
J16A
WG16A
For information on military temperature range products, please go to the Mil/Aero Web Site at http://www.national.com/appinfo/milaero/index.html.
漏 2000 National Semiconductor Corporation
DS008822
www.national.com
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