LM3940 datasheet(3/11 Pages) NSC

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Storage Temperature Range

−65˚C to +150˚C

Operating Junction Temperature Range

−40˚C to +125˚C

Lead Temperature (Soldering, 5 seconds)

260˚C

Power Dissipation (Note 2)

Internally Limited

Input Supply Voltage

7.5V

ESD Rating (Note 3)

2 kV

Electrical Characteristics

Limits in standard typeface are for T

J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: V

IN = 5V, IL = 1A, COUT = 33 µF.

Symbol

Parameter

Conditions

Typical

LM3940 (Note 4)

Units

min

max

Output Voltage

5 mA

≤ I

L ≤ 1A

3.3

3.20

3.40

3.13

3.47

Line Regulation

L = 5mA

4.5V

≤ V

O ≤ 5.5V

Load Regulation

50 mA

≤ I

L ≤ 1A

Output Impedance

L (DC) = 100 mA

L (AC) = 20 mA (rms)

Ω

f = 120 Hz

Quiescent Current

4.5V

≤ V

IN ≤ 5.5V

L = 5mA

IN = 5V

110

200

L = 1A

250

Output Noise Voltage

BW = 10 Hz–100 kHz

150

µV (rms)

L = 5mA

O −VIN

Dropout Voltage

L = 1A

0.5

0.8

(Note 5)

1.0

L = 100 mA

110

150

200

L(SC)

Short Circuit Current

L = 0

1.7

1.2

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-

vice outside of its rated operating conditions.

Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal resistance, θJ−A, and the

ambient temperature, TA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.

The value of

θJ−A (for devices in still air with no heatsink) is 60˚C/W for the TO-220 package, 80˚C/W for the TO-263 package, and 174˚C/W for the SOT-223 package.

The effective value of

θJ−A can be reduced by using a heatsink (see Application Hints for specific information on heatsinking).

Note 3: ESD rating is based on the human body model: 100 pF discharged through 1.5 k

Ω.

Note 4: All limits guaranteed for TJ = 25˚C are 100% tested and are used to calculate Outgoing Quality Levels. All limits at temperature extremes are guaranteed

via correlation using standard Statistical Quality Control (SQC) methods.

Note 5: Dropout voltage is defined as the input-output differential voltage where the regulator output drops to a value that is 100 mV below the value that is measured

at VIN = 5V.

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