LM3940IMP-3.3 datasheet(3/11 Pages) NSC

部品番号	LM3940IMP-3.3

部品情報	1A Low Dropout Regulator for 5V to 3.3V Conversion

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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

V

O

Output Voltage

5 mA

≤ I

L

≤ 1A

3.3

3.20

3.40

V

3.13

3.47

Line Regulation

I

L =5 mA

20

40

mV

4.5V

≤ V

O

≤ 5.5V

Load Regulation

50 mA

≤ I

L

≤ 1A

35

50

80

Z

O

Output Impedance

I

L (DC) = 100 mA

I

L (AC) = 20 mA (rms)

35

m

Ω

f = 120 Hz

I

Q

Quiescent Current

4.5V

≤ V

IN

≤ 5.5V

10

15

mA

I

L =5 mA

20

V

IN = 5V

110

200

I

L =1A

250

e

n

Output Noise Voltage

BW = 10 Hz–100 kHz

150

µV (rms)

I

L =5 mA

V

O −VIN

Dropout Voltage

I

L = 1A

0.5

0.8

V

(Note 5)

1.0

I

L = 100 mA

110

150

mV

200

I

L(SC)

Short Circuit Current

R

L = 0

1.7

1.2

A

Thermal Performance

Thermal Resistance

Junction-to-Case

3-Lead TO-220

4

˚C/W

3-Lead TO-263

4

˚C/W

Thermal Resistance

Junction-to-Ambient

3-Lead TO-220

60

˚C/W

3-Lead TO-263

80

˚C/W

8-Lead LLP (Note 2)

35

˚C/W

Note 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.

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 dependant 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 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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