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LM2940S-12 Datasheet

  • LM2940S-12

  • National Semiconductor [1A Low Dropout Regulator]

  • 500.42KB

  • NSC

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LM2940/LM2940C 1A Low Dropout Regulator
January 2003
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
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 (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
00882203
*
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
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
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
Output Voltage
5.0
LM2940CT-5.0
LM2940CS-5.0
LM2940LD-5.0
LM2940LD-8.0
8.0
9.0
LM2940CT-9.0
LM2940CS-9.0
LM2940LD-9.0
LM2940LD-10
10
12
LM2940CT-12
LM2940CS-12
LM2940LD-12
15
LM2940CT-15
LM2940CS-15
LM2940LD-15
Package
TO-220
TO-263
LLP 1k
Units
Tape and
Reel
LLP 4.5k
Units
Tape and
Reel
TO-220
TO-263
LM2940IMP-15
SOT-223
SOT-223
in Tape
and Reel
LM2940LDX-5.0
LM2940LDX-8.0 LM2940LDX-9.0
LM2940LDX-10 LM2940LDX-12
LM2940LDX-15
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
LM2940T-5.0
LM2940S-5.0
LM2940IMP-5.0
LM2940T-8.0
LM2940S-8.0
LM2940IMP-8.0
LM2940T-9.0
LM2940S-9.0
LM2940IMP-9.0
LM2940T-10
LM2940S-10
LM2940IMP-10
LM2940T-12
LM2940S-12
LM2940IMP-12
LM2940IMPX-5.0 LM2940IMPX-8.0 LM2940IMPX-9.0 LM2940IMPX-10 LM2940IMPX-12 LM2940IMPX-15
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.
漏 2003 National Semiconductor Corporation
DS008822
www.national.com

LM2940S-12 产品属性

  • National Semiconductor (TI)

  • 26 V

  • 12 V

  • 0.8 V at 1A, 0.15 V at 100 mA

  • 1 A (Typ)

  • 120 mV

  • 1

  • Fixed

  • + 125 C

  • SMD/SMT

  • TO-263

  • 120 mV

  • - 40 C

  • Tube

  • 45

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