LM2940CT-5.0 National Semiconductor, LM2940CT-5.0 Datasheet

IC, LDO VOLT REG, 5V, 1A, TO-220

LM2940CT-5.0

Manufacturer Part Number
LM2940CT-5.0
Description
IC, LDO VOLT REG, 5V, 1A, TO-220
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2940CT-5.0

Primary Input Voltage
26V
Output Voltage Fixed
5V
Dropout Voltage Vdo
500mV
No. Of Pins
3
Output Current
1A
Operating Temperature Range
0°C To +125°C
Termination Type
Through Hole
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 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
www.national.com
January 2007
Tape and
Tape and
Package
1k Units
TO-220
TO-263
TO-220
TO-263
Units
Reel
Reel
4.5k
LLP
LLP

Related parts for LM2940CT-5.0

LM2940CT-5.0 Summary of contents

Page 1

... May be increased without bound to maintain regulation during transients. Locate as close as possible to **C OUT 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 Temp Range 5.0 8.0 LM2940CT-5.0 0°C LM2940CS-5.0 ≤ ≤ LM2940CSX 125°C -5 ...

Page 2

Temp Range 5.0 LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 LM2940IMP-15 SOT-223 −40°C ≤ ≤ T LM2940IMPX LM2940IMPX A 85°C -5.0 Marking L53B L54B The physical size of the SOT-223 is too small to contain the full device part number. The package ...

Page 3

... 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 4

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 Voltage ...

Page 5

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 6

Output Voltage ( Parameter Conditions Ripple Rejection f = 120 Hz rms I = 100 mA O LM2940 LM2940C kHz rms Long Term Stability ...

Page 7

Typical Performance Characteristics Dropout Voltage Output Voltage vs. Temperature Quiescent Current Dropout Voltage vs. Temperature 882213 Quiescent Current vs. Temperature 882215 Quiescent Current 882217 7 882214 882216 882218 www.national.com ...

Page 8

Line Transient Response Ripple Rejection Low Voltage Behavior www.national.com Load Transient Response 882219 Low Voltage Behavior 882221 Low Voltage Behavior 882226 8 882220 882225 882227 ...

Page 9

Low Voltage Behavior 882228 Low Voltage Behavior 882230 Output at Voltage Extremes 882232 Low Voltage Behavior Output at Voltage Extremes Output at Voltage Extremes 9 882229 882231 882233 www.national.com ...

Page 10

Output at Voltage Extremes Output at Voltage Extremes Peak Output Current www.national.com Output at Voltage Extremes 882234 Output Capacitor ESR 882236 Output Impedance 882208 10 882235 882206 882222 ...

Page 11

Maximum Power Dissipation (TO-220) 882223 Maximum Power Dissipation (TO-263) 882210 Maximum Power Dissipation (SOT-223) 11 882224 www.national.com ...

Page 12

Equivalent Schematic Diagram www.national.com 12 882201 ...

Page 13

Application Information EXTERNAL CAPACITORS The output capacitor is critical to maintaining regulator stabil- ity, and must meet the required conditions for both ESR (Equivalent Series Resistance) and minimum amount of ca- pacitance. MINIMUM CAPACITANCE: The minimum output capacitance required to ...

Page 14

The value of θ will vary from about 1.5°C/W to (C−H) about 2.5°C/W (depending on method of at- tachment, insulator, etc.). If the ...

Page 15

FIGURE 6. Maximum Power Dissipation vs. T SOT-223 Package HEATSINKING LLP PACKAGE PARTS The value of θ for the LLP package is specifically dependent JA on PCB trace area, trace material, and the number of layers and thermal vias. It ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 3-Lead SOT-223 Package NS Package Number MP04A 16 Lead Dual-in-Line Package (J) See NS Package Number J16A 16 ...

Page 17

Lead Surface Mount Package (WG) See NS Package Number WG16A 3-Lead TO-220 Plastic Package (T) NS Package Number TO3B 17 www.national.com ...

Page 18

TO-263 Surface Mount Package (MP) NS Package Number TS3B 8-Lead LLP Order Number LM2940LD-5.0, LM2940LD-8.0, LM2940LD-9.0, LM2940LD-10, LM2940LD-12 or LM2940LD-15 NS Package Number LDC08A 18 ...

Page 19

Notes 19 www.national.com ...

Page 20

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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