LM3940IS-3.3 National Semiconductor, LM3940IS-3.3 Datasheet - Page 3

• Manufacturer Part Number: LM3940IS-3.3
• Description: V REG LDO +3.3V, 3940, SOT-263-3
• Manufacturer: National Semiconductor

Specifications of LM3940IS-3.3

• Primary Input Voltage: 5V
• Output Voltage: 3.3V
• Dropout Voltage Vdo: 110mV
• No. Of Pins: 3
• Output Current: 1A
• Voltage Regulator Case Style: SOT-263
• Operating Temperature Range: -40°C To +125°C
• Svhc: No
• Output Voltage Fixed: 3.3V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Thermal Resistance
Junction-to-Case
Thermal Resistance
Junction-to-Ambient
V
Z
I
e
V
I
Q
L
O
n
O
O
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
less otherwise specified: V
(SC)
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
ambient temperature, T
The value of θ
The effective value of θ
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 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
Operating Junction Temperature Range −40˚C to +125˚C
Symbol
− V
IN
JA
IN
(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.
= 5V.
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Dropout Voltage
(Note 5)
Short Circuit Current
A
JA
. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
can be reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of θ
Parameter
IN
J
= 25˚C are 100% tested and are used to calculate Outgoing Quality Levels. All limits at temperature extremes are guaranteed
= 5V, I
3-Lead TO-220
3-Lead TO-263
3-Lead TO-220
3-Lead TO-263
8-Lead LLP (Note 2)
L
J
= 1A, C
= 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
−65˚C to +150˚C
OUT
5 mA ≤ I
I
4.5V ≤ V
50 mA ≤ I
I
I
f = 120 Hz
4.5V ≤ V
I
V
I
BW = 10 Hz–100 kHz
I
I
I
R
L
L
L
L
L
L
L
L
IN
L
(DC) = 100 mA
(AC) = 20 mA (rms)
(Note 1)
= 5 mA
= 5 mA
= 1A
= 5 mA
= 1A
= 100 mA
= 0
= 5V
= 33 µF.
Conditions
L
O
IN
L
≤ 1A
≤ 5.5V
≤ 5.5V
≤ 1A
3
Lead Temperature (Soldering, 5 seconds)
Power Dissipation (Note 2)
Input Supply Voltage
ESD Rating (Note 3)
Typical
4
4
60
80
35
110
150
110
3.3
0.5
1.7
20
35
35
10
J
, the junction-to-ambient thermal resistance, θ
LM3940 (Note 4)
3.20
3.13
min
1.2
max
3.40
3.47
200
250
150
200
0.8
1.0
40
50
80
15
20
JA
Internally Limited
for the LLP package
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
www.national.com
µV (rms)
JA
Units
mΩ
260˚C
mV
mA
mV
, and the
V
V
A
7.5V
2 kV