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

the device outside of its rated operating conditions.

2) 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.

3) Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal

shutdown.

Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed

to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.

Semelab encourages customers to verify that datasheets are current before placing orders.

Document Number 5282

Issue 1

LM3940

Parameter

Test Conditions

Min

Typ

Max

Units

5mA

≤ I

3.13

3.3

3.47

V

∆V

OUT

Line Regulation

∆V

IN

20

40

mV

∆V

OUT

∆I

OUT

50mA

≤ I

35

80

Output impedance

35

m

Ω

I

Q

Quiescent Current

10

20

mA

110

250

150

µV (rms)

0.5

1.0

V

110

200

mV

1.2

1.7

A

Parameter

Package Style

R

θθ

JC

R

θθ

JA

Thermal Resistance (Junction to Ambient)

And

TO-204AA (TO-3)

4.0 oC/W

50 oC/W

TO-213AA (TO-66)

4.5 oC/W

55 oC/W

SMD05 (TO-276AA)

4.75 oC/W

65 oC/W

SMD1 (TO-276AB)

4.75 oC/W

65 oC/W

TO-257AA

5.0 oC/W

65 oC/W

TO-258AA

4.5 oC/W

55 oC/W

LCC4

20 oC/W

150 oC/W

LCC20

25 oC/W

165 oC/W

LCC28

22 oC/W

160 oC/W

Electrical Characteristics

Thermal Characteristics