If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Input Voltage

Continuous

26V

Transient (t

≤ 100 ms)

60V

Internal Power Dissipation (Note 2)

Internally Limited

Maximum Junction Temperature

150˚C

Storage Temperature Range

−65˚C to +150˚C

Lead Temperature Soldering

TO-220 (10 seconds)

260˚C

TO-263 (10 seconds)

230˚C

SOT-223 (Vapor Phase, 60 seconds)

215˚C

SOT-223 (Infrared, 15 seconds)

220˚C

ESD Susceptibility (Note 3)

2 kV

Temperature Range (Note 2)

LM2937ES, LM2937ET

−40˚C

≤ T

LM2937IMP

−40˚C

≤ T

Input Voltage Range

4.75V to 26V

V

= 10 µF unless otherwise indicated. Boldface limits apply over the entire operating temperature range, of the indicated

device, all other specifications are for T

Output Voltage (V

2.5V

3.3V

Units

Parameter

Conditions

Typ

Limit

Typ

Limit

Output Voltage

5 mA

≤ I

2.42

3.20

V (Min)

2.5

2.38

3.3

3.14

V(Min)

2.56

3.40

V(Max)

2.62

3.46

V(Max)

Line Regulation(Note 5)

4.75V

≤ V

7.5

25

9.9

33

mV(Max)

I

Load Regulation

5 mA

≤ I

2.5

25

3.3

33

mV(Max)

Quiescent Current

7V

≤ V

2

10

2

10

mA(Max)

I

V

10

20

10

20

mA(Max)

I

V

66

100125

66

100125

mA(Max)

Output Noise

10 Hz–100 kHz,

75

99

µVrms

Voltage

I

Long Term Stability

1000 Hrs.

10

13.2

mV

Short-Circuit Current

1.0

0.6

1.0

0.6

A(Min)

Peak Line Transient

t

75

60

75

60

V(Min)

Voltage

Maximum Operational

26

26

V(Min)

Input Voltage

Reverse DC

V

−30

−15

−30

−15

V(Min)

Input Voltage

Reverse Transient

t

−75

−50

−75

−50

V(Min)

Input Voltage

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device

outside of its rated Operating Conditions.

and the electrical specifications do not apply. If the die temperature rises above 150˚C, the regulator will go into thermal shutdown. The junction-to-ambient thermal

resistance

sum of the device junction-to-case thermal resistance

used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package (see Application Hints for more information

on heatsinking).

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

Ω.

Note 5: The minimum input voltage required for proper biasing of these regulators is 4.75V. Below this level the outputs will fall out of regulation. This effect is not

the normal dropout characteristic where the output falls out of regulation due to the PNP pass transistor entering saturation. If a value for worst case effective input

to output dropout voltage is required in a specification, the values should be 2.37V maximum for the LM2937-2.5 and 1.6V maximum for the LM2937-3.3.

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