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MNLM2940-12-X Datasheet

  • MNLM2940-12-X

  • National Semiconductor [1A LOW DROPOUT REGULATOR]

  • NSC

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MICROCIRCUIT DATA SHEET
MNLM2940-12-X REV 1A1
1A LOW DROPOUT REGULATOR
General Description
The LM2940 positive voltage regulator features the ability to source 1A of ouput 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 voltage 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).
Designed also for vehicular applications, the LM2940 and all regulated circuitry are
protected from reverse battery installations or 2-battery jumps. During line transients,
such as load dump when the input voltage can momentarily exceed the specified maximum
operating voltage, the regulator will automaically shut down to protect both the internal
circuits and the load. The LM2940 cannot be harmed by temporary mirror-image insertion.
Familiar regulator features such as short circuit and thermal overload protection are also
provided.
Original Creation Date: 07/22/96
Last Update Date: 10/08/99
Last Major Revision Date: 07/22/96
Industry Part Number
LM2940
NS Part Numbers
LM2940J-12/883
LM2940K-12/883
LM2940WG-12/883
Prime Die
LM2940
Controlling Document
SEE FEATURE SECTION
Processing
MIL-STD-883, Method 5004
Subgrp Description
1
2
3
4
5
6
7
8A
8B
9
10
11
Static tests at
Static tests at
Static tests at
Dynamic tests at
Dynamic tests at
Dynamic tests at
Functional tests at
Functional tests at
Functional tests at
Switching tests at
Switching tests at
Switching tests at
Temp (
o
C)
+25
+125
-55
+25
+125
-55
+25
+125
-55
+25
+125
-55
Quality Conformance Inspection
MIL-STD-883, Method 5005
1

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