LM3940IT-3.3 National Semiconductor, LM3940IT-3.3 Datasheet - Page 3

• Manufacturer Part Number: LM3940IT-3.3
• Description: IC, LDO VOLT REG, 3.3V, 1A, TO-220
• Manufacturer: National Semiconductor

Specifications of LM3940IT-3.3

• Primary Input Voltage: 5V
• Output Voltage Fixed: 3.3V
• Dropout Voltage Vdo: 110mV
• No. Of Pins: 3
• Output Current: 1A
• Operating Temperature Range: -40°C To +125°C
• Termination Type: Through Hole
• Dc: N/A
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Limits in standard typeface are for T
otherwise specified: V
Thermal Performance
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, T
the ambient temperature, T
shutdown. The value of θ
SOT-223 package. The effective value of θ
θ
and power dissipation for the LLP package, refer to Application Note AN-1187. The θ
under the exposed pad.
Note 3: ESD rating is based on the human body model: 100 pF discharged through 1.5 kΩ.
Note 4: All limits guaranteed for T
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 V
Storage Temperature Range
Lead Temperature (Soldering, 5 seconds)
Power Dissipation (Note 2)
JA
Symbol
Junction-to-Ambient, θ
I
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
L
Junction-to-Case, θ
V
(SC)
V
Z
Thermal Resistance
Thermal Resistance
I
e
DO
Q
O
O
n
IN
= 5V.
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Dropout Voltage
(Note 5)
Short Circuit Current
JA
IN
A
(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
. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal
JC
= 5V, I
Parameter
JA
J
= 25°C are 100% tested and are used to calculate Outgoing Quality Levels. All limits at temperature extremes are guaranteed
L
= 1A, C
3-Lead TO-220
3-Lead TO-263
8-Lead LLP
3-Lead TO-220
3-Lead TO-263
8-Lead LLP (Note 2)
JA
J
can be reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of
= 25°C, and limits in boldface type apply over the full operating temperature range. Unless
OUT
−65°C to +150°C
Internally Limited
= 33 μF.
5 mA
I
4.5V
50 mA
I
I
f = 120 Hz
4.5V
I
V
I
BW = 10 Hz–100 kHz
I
I
I
R
L
L
L
L
L
L
L
L
(Note 1)
IN
L
= 5 mA
(DC) = 100 mA
(AC) = 20 mA (rms)
= 5 mA
= 1A
= 5 mA
= 1A
= 100 mA
= 0
= 5V
≤
≤
≤
260°C
≤
V
V
I
L
IN
IN
Conditions
I
L
≤
≤
≤
≤
1A
5.5V
5.5V
1A
3
Operating Ratings
JA
Input Supply Voltage
ESD Rating (Note 3)
Junction Temperature Range, T
Input Supply Voltage, V
rating for the LLP is with a JESD51-7 test board having 6 thermal vias
Typical
110
150
110
3.3
0.5
1.7
20
35
35
10
J
, the junction-to-ambient thermal resistance, θ
60
80
35
4
4
6
IN(MIN)
LM3940 (Note 4)
3.20
3.13
min
1.2
J
(Note 1)
max
3.40
3.47
200
250
150
200
0.8
1.0
40
50
80
15
20
−40°C to +125°C
www.national.com
V
μV (rms)
O
Units
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
mV
mΩ
mA
mV
+ V
JA
V
V
A
7.5V
2 kV
, and
DO