LM2940 datasheet(7/19 Pages) NSC

7 / 19 page

Electrical Characteristics (Continued)

IN =VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating tempera-

ture range of the indicated device. All other specifications apply for T

A =TJ = 25˚C.

Output Voltage (V

12V

15V

Units

LM2940

LM2940/833

LM2940

LM2940/833

Parameter

Conditions

Typ

Limit

Typ

Limit

(Note 4)

(Note 5)

(Note 4)

(Note 5)

Long Term

mV/

Stability

1000 Hr

Dropout Voltage

O = 1A

0.5

0.8/1.0

0.7/1.0

0.5

0.8/1.0

0.7/1.0

MAX

O = 100 mA

110

150/200

110

150/200

MAX

Short Circuit

(Note 6)

1.9

1.6

1.6/1.3

1.9

1.6

1.6/1.3

MIN

Current

Maximum Line

O = 100

Ω

Transient

LM2940, T

≤ 100 ms

60/60

LM2940/883, T

≤ 20 ms

40/40

MIN

LM2940C, T

≤ 1 ms

5545

Reverse Polarity

O = 100

Ω

DC Input

LM2940, LM2940/883

−30

−15/−15

MIN

Voltage

LM2940C

−30

−15

−30

−15

Reverse Polarity

O = 100

Ω

Transient Input

LM2940, T

≤ 100 ms

−75

−50/−50

Voltage

LM2940/883, T

≤ 20 ms

−45/−45

MIN

LM2940C, T

≤ 1 ms

−55

−45/−45

−55

−45/−45

Thermal Performance

Thermal Resistance

Junction-to-Case

3-Lead TO-220

˚C/W

3-Lead TO-263

˚C/W

Thermal Resistance

Junction-to-Ambient

3-Lead TO-220

˚C/W

3-Lead TO-263

˚C/W

8-Lead LLP (Note 2)

˚C/W

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions

but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics.

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

θJA (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

θJA can be reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of θJA for the LLP package

is specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for

the LLP package, refer to Application Note AN-1187. It is recommended that 6 vias be placed under the center pad to improve thermal performance.

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

Ω.

Note 4: All limits are guaranteed at TA =TJ = 25˚C only (standard typeface) or over the entire operating temperature range of the indicated device (boldface type).

All limits at TA =TJ = 25˚C are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control

methods.

Note 5: All limits are guaranteed at TA =TJ = 25˚C only (standard typeface) or over the entire operating temperature range of the indicated device (boldface type).

All limits are 100% production tested and are used to calculate Outgoing Quality Levels.

Note 6: Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.

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