LM2940-N, LM2940C

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SNVS769I – MARCH 2000 – REVISED APRIL 2013

LM2940-N/LM2940C 1A Low Dropout Regulator

Check for Samples: LM2940-N, LM2940C

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FEATURES

DESCRIPTION

The LM2940-N/LM2940C positive voltage regulator

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•

features the ability to source 1A of output current with

•

Output Current in Excess of 1A

a dropout voltage of typically 0.5V and a maximum of

•

Output Voltage Trimmed Before Assembly

1V over the entire temperature range. Furthermore, a

quiescent current reduction circuit has been included

•

Reverse Battery Protection

which

reduces

the

ground

current

when

the

•

Internal Short Circuit Current Limit

differential between the input voltage and the output

•

Mirror Image Insertion Protection

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

Designed also for vehicular applications, the LM2940-

N/LM2940C 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

automatically shut down to protect both the internal

circuits and the load. The LM2940/LM2940C cannot

be harmed by temporary mirror-image insertion.

Familiar regulator features such as short circuit and

thermal overload protection are also provided.

Typical Application

*Required if regulator is located far from power supply filter.

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.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.