LM2940CT-12/NOPB National Semiconductor, LM2940CT-12/NOPB Datasheet
LM2940CT-12/NOPB
Manufacturer Part Number
LM2940CT-12/NOPB
Description
IC REGULATOR LDO 1A TO220-3
Manufacturer
National Semiconductor
Type
Voltage Regulatorr
Specifications of LM2940CT-12/NOPB
Regulator Topology
Positive Fixed
Voltage - Output
12V
Voltage - Input
13.6 ~ 26 V
Voltage - Dropout (typical)
0.5V @ 1A
Number Of Regulators
1
Current - Output
1A
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-3 (Straight Leads)
Current, Output
1 A
Current, Supply
30 mA
Package Type
TO-220
Regulation, Line
20 mV
Regulation, Load
55 mV
Regulator Type
Low Dropout
Resistance, Thermal, Junction To Case
4 °C/W
Temperature, Operating, Range
0 to +125 °C
Voltage, Dropout
0.5 V
Voltage, Input
26 V
Voltage, Noise
360 μV
Voltage, Output
12 V
Primary Input Voltage
26V
Output Voltage Fixed
12V
Dropout Voltage Vdo
500mV
No. Of Pins
3
Output Current
1A
Operating Temperature Range
0°C To +125°C
Msl
MSL 1 - Unlimited
Current Rating
1A
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Other names
*LM2940CT-12
*LM2940CT-12/NOPB
LM2940CT-12
*LM2940CT-12/NOPB
LM2940CT-12
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2940CT-12/NOPB
Manufacturer:
NSC
Quantity:
90
Part Number:
LM2940CT-12/NOPB
Manufacturer:
NS/国半
Quantity:
20 000
© 2007 National Semiconductor Corporation
LM2940/LM2940C
1A Low Dropout Regulator
General Description
The LM2940/LM2940C positive voltage regulator features the
ability to source 1A of output current with a dropout voltage of
typically 0.5V and a maximum of 1V over the entire temper-
ature range. Furthermore, a quiescent current reduction cir-
cuit has been included which reduces the ground current
when the differential between the input voltage and the output
voltage exceeds approximately 3V. The quiescent current
with 1A of output current and an input-output differential of 5V
is therefore only 30 mA. Higher quiescent currents only exist
when the regulator is in the dropout mode (V
Designed also for vehicular applications, the LM2940/
LM2940C and all regulated circuitry are protected from re-
verse battery installations or 2-battery jumps. During line
transients, such as load dump when the input voltage can
momentarily exceed the specified maximum operating volt-
Typical Application
*Required if regulator is located far from power supply filter.
**C
the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.
Ordering Information
Range
≤
−40°C
≤
−40°C
≤
125°C
125°C
125°C
Temp
0°C
OUT
T
T
T
J
J
J
must be at least 22 μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to
≤
≤
≤
LM2940CT-5.0
LM2940CS-5.0
LM2940SX-5.0 LM2940SX-8.0 LM2940SX-9.0
LM2940LD-5.0
LM2940S-5.0
LM2940T-5.0
LM2940CSX
LM2940LDX
-5.0
-5.0
5.0
LM2940LD-8.0
LM2940T-8.0
LM2940S-8.0
LM2940LDX
-8.0
8.0
–
–
–
8822
IN
LM2940CT-9.0
LM2940CS-9.0
LM2940LD-9.0
LM2940S-9.0
LM2940T-9.0
− V
LM2940CSX
LM2940LDX
OUT
-9.0
-9.0
9.0
Output Voltage
≤
3V).
LM2940LD-10
LM2940SX-10
age, the regulator will automatically shut down to protect both
the internal circuits and the load. The LM2940/LM2940C can-
not be harmed by temporary mirror-image insertion. Familiar
regulator features such as short circuit and thermal overload
protection are also provided.
Features
■
■
■
■
■
■
■
LM2940T-10
LM2940S-10
LM2940LDX
Dropout voltage typically 0.5V @I
Output current in excess of 1A
Output voltage trimmed before assembly
Reverse battery protection
Internal short circuit current limit
Mirror image insertion protection
P
+
-10
10
–
–
–
Product Enhancement tested
882203
LM2940CT-12
LM2940CS-12
LM2940SX-12
LM2940LD-12
LM2940S-12
LM2940CSX
LM2940T-12
LM2940LDX
-12
-12
12
LM2940CS-15
LM2940CT-15
LM2940LD-15
LM2940CSX
LM2940LDX
O
= 1A
-15
-15
15
–
–
–
Tape and
Tape and
Package
1k Units
TO-220
TO-263
TO-220
TO-263
Units
Reel
Reel
4.5k
LLP
LLP
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LM2940CT-12/NOPB Summary of contents
Page 1
... LM2940LD-9.0 LM2940LD-10 LM2940LDX LM2940LDX -9.0 -10 LM2940T-9.0 LM2940T-10 LM2940S-9.0 LM2940S-10 LM2940SX-10 8822 = 1A O 882203 Package 12 15 LM2940CT-12 LM2940CT-15 LM2940CS-12 LM2940CS-15 LM2940CSX LM2940CSX -12 -15 1k Units LM2940LD-12 LM2940LD-15 Tape and LM2940LDX LM2940LDX -12 -15 Tape and – LM2940T-12 – LM2940S-12 – LM2940SX-12 ...
Page 2
... I = 100 mA O SOT-223 (MP) (Note 1) LLP-8 (LD) ESD Susceptibility (Note 4) Operating Conditions 60V Input Voltage Temperature Range 45V LM2940T, LM2940S Internally Limited LM2940CT, LM2940CS 150°C LM2940IMP ≤ ≤ −65°C T +150°C LM2940J, LM2940WG J LM2940LD 260°C, 10s 235°C, 30s = T = 25°C. ...
Page 3
Output Voltage ( Parameter Conditions Short Circuit (Note 7) Current = 100Ω Maximum Line R O ≤ Transient LM2940, T 100 ms ≤ LM2940/883, T ≤ LM2940C 100Ω Reverse Polarity Input ...
Page 4
Output Voltage ( Parameter Conditions Dropout Voltage 100 mA O Short Circuit (Note 7) Current = 100Ω Maximum Line R O ≤ Transient T 100 ms LM2940 LM2940C = 100Ω Reverse Polarity ...
Page 5
Output Voltage ( Parameter Conditions Ripple Rejection f = 120 Hz rms I = 100 mA O LM2940 LM2940C kHz rms Long Term ...
Page 6
Lead Surface Mount Package (WG) See NS Package Number WG16A 3-Lead TO-220 Plastic Package (T) NS Package Number TO3B 17 ...