Original Creation Date: 07/22/96

Last Update Date: 10/08/99

Last Major Revision Date: 07/22/96

MNLM2940-12-X REV 1A1

MICROCIRCUIT DATA SHEET

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.

NS Part Numbers

LM2940J-12/883

LM2940K-12/883

LM2940WG-12/883

Industry Part Number

LM2940

Prime Die

LM2940

Controlling Document

SEE FEATURE SECTION

Processing

MIL-STD-883, Method 5004

Quality Conformance Inspection

MIL-STD-883, Method 5005

Subgrp Description

Temp ( C)

o

1

Static tests at

+25

2

Static tests at

+125

3

Static tests at

-55

4

Dynamic tests at

+25

5

Dynamic tests at

+125

6

Dynamic tests at

-55

7

Functional tests at

+25

8A

Functional tests at

+125

8B

Functional tests at

-55

9

Switching tests at

+25

10

Switching tests at

+125

11

Switching tests at

-55

1