Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Input Voltage

Operating Range

26V

Overvoltage Protection

LM2931A, LM2931C

(Adjustable)

60V

LM2931

50V

Internal Power Dissipation

(Note 2) (Note 4)

Internally Limited

Operating Ambient Temperature

Range

−40˚C to +85˚C

Maximum Junction Temperature

125˚C

Storage Temperature Range

−65˚C to +150˚C

Lead Temp. (Soldering, 10 seconds)

230˚C

ESD Tolerance (Note 5)

2000V

Electrical Characteristics for Fixed 3.3V Version

V

Parameter

Conditions

LM2931-3.3

Units

Typ

Limit

(Note 3)

Output Voltage

3.3

3.465

3.135

V

MAX

V

MIN

4V

≤ V

−40˚C

≤ T

3.630

2.970

V

MAX

V

MIN

Line Regulation

4V

≤ V

4

33

mV

MAX

Load Regulation

5mA

≤ I

10

50

mV

MAX

Output Impedance

100mA

100Hz - 10kHz

200

m

Ω

Quiescent Current

I

0.4

1.0

mA

MAX

−40˚C

≤ T

I

15

mA

Output Noise Voltage

10Hz -100kHz, C

330

µV

rms

Long Term Stability

13

mV/1000 hr

Ripple Rejection

f

80

dB

Dropout Voltage

I

I

0.05

0.30

0.2

0.6

V

MAX

Maximum Operational Input

Voltage

33

26

V

MIN

Maximum Line Transient

R

T = 1ms,

τ≤ 100ms

70

50

V

MIN

Reverse Polarity Input

Voltage, DC

V

−30

−15

V

MIN

Reverse Polarity Input

Voltage, Transient

T = 1ms,

τ≤ 100ms, R

−80

−50

V

MIN

Electrical Characteristics for Fixed 5V Version

V

Parameter

Conditions

LM2931A-5.0

LM2931-5.0

Units

Typ

Limit

(Note 3)

Typ

Limit

(Note 3)

Output Voltage

5

5.19

4.81

5

5.25

4.75

V

MAX

V

MIN

6.0V

≤ V

−40˚C

≤ T

5.25

4.75

5.5

4.5

V

MAX

V

MIN

Line Regulation

9V

≤ V

6V

≤ V

2

4

10

30

2

4

10

30

mV

MAX

www.national.com

5