LM2940/LM2940C
电极臂
1A Low Dropout Regulator
General Description
The LM2940/LM2940C positive voltage regulator features the ability to source 1A of output current with a dropout volt-age of typically 0.5V and a maximum of 1V over the entire temperature range.Furthermore,a quiescent current reduc-tion circuit has been included which reduces the ground cur-rent 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 differ-ential of 5V is therefore only 30mA.Higher quiescent cur-rents only exist when the regulator is in the dropout mode (V IN −V OUT ≤3V).
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-age,the regulator will automatically shut down to protect both the internal circuits and the load.The LM2940/LM2940C cannot be harmed by temporary mirror-image in-sertion.Familiar regulator features such as short circuit and thermal overload protection are also provided.
Features
n Dropout voltage typically 0.5V @I O =1A n Output current in excess of 1A
n Output voltage trimmed before assembly n Reverse battery protection
n Internal short circuit current limit n Mirror image insertion protection n
P +Product Enhancement tested
Typical Application
Ordering Information
Temperature
Range Output Voltage
Package 5.0
8.0
9.010
12150˚C ≤T A ≤125˚C LM2940CT-5.0LM2940CT-9.0LM2940CT-12LM2940CT-15TO-220LM2940CS-5.0LM2940CS-9.0LM2940CS-12LM2940CS-15
TO-263−40˚C ≤T A ≤125˚C LM2940T-5.0LM2940T-8.0LM2940T-9.0LM2940T-10LM2940T-12TO-220LM2940S-5.0LM2940S-8.0LM2940S-9.0LM2940S-10LM2940S-12
TO-263−40˚C ≤T A ≤85˚C LM2940IMP-5.0LM2940IMP-8.0LM2940IMP-9.0LM2940IMP-10LM2940IMP-12
LM2940IMP-15SOT-223
SOT-223Package Marking
L53B
L54B
L0EB
L55B
L56B
L70B
−55˚C ≤T A ≤125˚C
LM2940K-5.0/883LM2940K-8.0/883LM2940K-12/883LM2940K-15/883TO-3
The physical size of the SOT-223is too small to contain the full device part number.The package markings indicated are what will appear on the actual device.
DS008822-3
*Required if regulator is located far from power supply filter.
**C OUT must be at least 22µF to maintain stability.May be increased without bound to maintain regulation during transients.Locate as close as possible
to the regulator.This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical;see curve.
December 1997
Absolute Maximum Ratings (Notes 2,1)
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
LM2940S,T,IMP ≤100ms 60V LM2940K/883≤20ms 40V LM2940CS,T ≤1ms 45V Internal Power Dissipation (Note 3)Internally Limited Maximum Junction Temperature 150˚C Storage Temperature Range −65˚C ≤T J ≤+150˚C Lead Temperature,Time for Wave Soldering TO-3(K)Package 300˚C,10s
TO-220(T)Package
260˚C,10s TO-263(S)Package 260˚C,4s SOT-223(IMP)Package 260˚C,4s
ESD Susceptibility (Note 4)2kV
Operating Conditions (Note 1)
Input Voltage
26V
Temperature Range LM2940K/883
−55˚C ≤T A ≤125˚C LM2940T,LM2940S −40˚C ≤T A ≤125˚C LM2940CT,LM2940CS 0˚C ≤T A ≤125˚C LM2940IMP
−40˚C ≤T A ≤85˚C
Electrical Characteristics
V IN =V O +5V,I O =1A,C O =22µF,unless otherwise specified.Boldface limits apply over the entire operating tempera-ture range of the indicated device.All other specifications apply for T A =T J =25˚C
Output Voltage (V O )
5V 8V Units
LM2940LM2940/883
LM2940LM2940/883
Parameter
Conditions
Typ
Limit Limit Typ
Limit Limit (Note 5)
(Note 6)(Note 5)(Note 6)6.25V ≤V IN ≤26V 9.4V ≤V IN ≤26V
Output Voltage 5mA ≤I O ≤1A 5.00 4.85/4.75 4.85/4.758.007.76/7.607.76/7.60V MIN 5.15/5.25
5.15/5.258.24/8.40
8.24/8.40V MAX Line Regulation V O +2V ≤V IN ≤26V,20
50
40/50
2080
50/80
mV MAX I O =5mA Load Regulation
50mA ≤I O ≤1A LM2940,LM2940/8833550/8050/100
5580/13080/130
mV MAX
LM2940C
35
50
55
80
Output 100mADC and Impedance 20mArms,35
1000/1000
55
1000/1000
m Ω
f O =120Hz Quiescent V O +2V ≤V IN ≤26V,Current
I O =5mA
LM2940,LM2940/8831015/2015/20
10
15/20
15/20
mA MAX
LM2940C
1015V IN =V O +5V,3045/60
50/603045/60
50/60mA MAX I O =1A
Output Noise 10Hz −100kHz,150
700/700
240
1000/1000
µV rms
Voltage I O =5mA
Ripple Rejection
f O =120Hz,1V rms ,I O =100mA LM2940
7260/546654/48dB MIN
LM2940C
72
60
66
54
f O =1kHz,1V rms ,60/50
54/48
dB MIN I O =5mA
Long Term 20
32mV/Stability 1000Hr Dropout Voltage I O =1A
0.50.8/1.00.7/1.00.50.8/1.00.7/1.0V MAX I O =100mA 110150/200150/200110150/200150/200mV MAX Short Circuit Current
(Note 7)
1.9
1.6
1.5/1.3
1.9
1.6
1.6/1.3
A MIN
Electrical Characteristics
(Continued)
V IN =V O +5V,I O =1A,C O =22µF,unless otherwise specified.Boldface limits apply over the entire operating tempera-ture range of the indicated device.All other specifications apply for T A =T J =25˚C
Output Voltage (V O )
5V 8V Units
LM2940
LM2940/883
LM2940LM2940/883
Parameter Conditions Typ
Limit Limit Typ
Limit Limit (Note 5)
(Note 6)
(Note 5)(Note 6)
Maximum Line R O =100Ω
V MIN
Transient
LM2940,T ≤100ms
7560/60
7560/60
LM2940/883,T ≤20ms
40/40
40/40LM2940C,T ≤1ms 55455545Reverse Polarity R O =100Ω
DC Input Voltage LM2940,LM2940/883−30−15/−15−15/−15
−30−15/−15−15/−15
V MIN
LM2940C −30−15−30−15Reverse Polarity R O =100Ω
Transient Input LM2940,T ≤100ms −75−50/−50
−75
−50/−50
V MIN
Voltage
LM2940/883,T ≤20ms −45/−45
−45/−45
LM2940C,T ≤1ms
−55
−45/−45
Electrical Characteristics
V IN =V O +5V,I O =1A,C O =22µF,unless otherwise specified.Boldface limits apply over the entire operating tempera-ture range of the indicated device.All other specifications apply for T A =T J =25˚C
Output Voltage (V O )
9V 10V
Units
Parameter
Conditions
Typ
LM2940Typ
LM2940Limit Limit (Note 5)
(Note 5)
10.5V ≤V IN ≤26V
11.5V ≤V IN ≤26V
Output Voltage 5mA ≤I O ≤1A 9.008.73/8.5510.009.70/9.50V MIN 9.27/9.45
10.30/10.50
V MAX Line Regulation V O +2V ≤V IN ≤26V,20
90
20100
mV MAX I O =5mA Load Regulation
50mA ≤I O ≤1A LM29406090/15065
100/165
mV MAX
LM2940C
60
90
Output Impedance
100mADC and 20mArms,60
65
m Ω
f O =120Hz
Quiescent V O +2V ≤V IN <26V,Current
I O =5mA LM2940
1015/2010
15/20
mA MAX
LM2940C
1015V IN =V O +5V,I O =1A
3045/60
3045/60
mA MAX Output Noise 10Hz −100kHz,270
300
µV rms
Voltage I O =5mA
Ripple Rejection
f O =120Hz,1V rms ,I O =100mA LM29406452/4663电子
监管码
设备 51/45
dB MIN
LM2940C
6452
Long Term Stability
34
36
mV/1000Hr
Electrical Characteristics
(Continued)
V IN =V O +5V,I O =1A,C O =22µF,unless otherwise specified.Boldface limits apply over the entire operating tempera-ture range of the indicated device.All other specifications apply for T A =T J =25˚C
Output Voltage (V O )
Units
Parameter Conditions
Typ LM2940
Typ
LM2940Limit Limit (Note 5)(Note 5)Dropout Voltage I O =1A
0.50.8/1.00.50.8/1.0V MAX I O =100mA 110150/200110150/200mV MAX Short Circuit (Note 7)
1.9
1.6
1.9 1.6
A MIN Current Maximum Line R O =100ΩTransient
T ≤100ms LM2940
7560/607560/60V MIN
LM2940C 5545Reverse Polarity R O =100ΩDC Input Voltage LM2940−30−15/−15−30−15/−15V MIN
LM2940C −30
−15
Reverse Polarity R O =100ΩTransient Input T ≤100ms Voltage
LM2940−75−50/−50−75−50/−50V MIN
LM2940C
−55
−45/−45
Electrical Characteristics
V IN =V O +5V,I O =1A,C O =22µF,unless otherwise specified.Boldface limits apply over the entire operating tempera-ture range of the indicated device.All other specifications apply for T A =T J =25˚C
Output Voltage (V O )
12V 15V Units
LM2940LM2940/833
LM2940LM2940/833
Parameter
Conditions
Typ
Limit Limit Typ
Limit Limit (Note 5)
(Note 6)(Note 5)(Note 6)13.6V ≤V IN ≤26V 16.75V ≤V IN ≤26V
Output Voltage 5mA ≤I O ≤1A 12.0011.64/11.4011.64/11.4015.0014.55/14.2514.55/14.25V MIN 12.36/12.60
12.36/12.6015.45/15.75
15.45/15.75V MAX Line Regulation V O +2V ≤V IN ≤26V,20
120
75/120
20150
95/150
mV MAX I O =5mA Load Regulation
50mA ≤I O ≤1A LM2940,LM2940/88355120/200120/190
150/240
mV MAX
LM2940C
55
120
70
150
Output 100mADC and Impedance 20mArms,80
1000/1000
100
1000/1000
m Ω
f O =120Hz Quiescent Current
V O +2V ≤V IN ≤26V,I O =5mA
LM2940,LM2940/8831015/2015/20
15/20
mA MAX
LM2940C
10151015V IN =V O +5V,I O =1A
3045/60
50/603045/60
50/60mA MAX Output Noise 10Hz −100kHz,360
1000/1000450
1000/1000
µV rms
Voltage
I O =5mA
Electrical Characteristics
(Continued)
V IN =V O +5V,I O =1A,C O =22µF,unless otherwise specified.Boldface limits apply over the entire operating tempera-ture range of the indicated device.All other specifications apply for T A =T J =25˚C
Output Voltage (V O )
12V 15V Units
LM2940
LM2940/833
LM2940LM2940/833
Parameter Conditions Typ
Limit Limit Typ
Limit Limit (Note 5)
(Note 6)
(Note 5)
(Note 6)
Ripple Rejection
f O =120Hz,1V rms ,I O =100mA LM2940
6654/48dB MIN LM2940C
66
54
64
52
f O =1kHz,1V rms ,52/46
48/42
dB MIN I O =5mA
Long Term 4860
mV/Stability 1000Hr Dropout Voltage I O =1A
0.50.8/1.00.7/1.00.50.8/1.00.7/1.0V MAX I O =100mA 110150/200150/200110150/200150/200mV MAX Short Circuit (Note 7)
1.9
1.6
1.6/1.3
1.9
1.6
1.6/1.3
A MIN
Current Maximum Line R O =100Ω
Transient
LM2940,T ≤100ms 7560/60
LM2940/883,T ≤20ms
40/40
40/40
V MIN
LM2940C,T ≤1ms 554555
45
硬币
组合Reverse Polarity R O =100ΩDC Input LM2940,LM2940/883−30−15/−15−15/−15
−15/−15
电线固定座V MIN
Voltage LM2940C −30−15−30
−15
Reverse Polarity R O =100Ω
Transient Input LM2940,T ≤100ms −75−50/−50
Voltage
LM2940/883,T ≤20ms −45/−45
−45/−45
V MIN
LM2940C,T ≤1ms −55
−45/−45
−55
−45/−45
Note 1:Absolute Maximum Ratings are limits beyond which damage to the device may occur.Operating Conditions are conditions under which the device functions but the specifications might not be guaranteed.For guaranteed specifications and test conditions see the Electrical Characteristics.
Note 2:Military specifications complied with RETS/SMD at the time of printing.For current specifications refer to RETS LM2940K-5.0,LM2940K-8.0,LM2940K-12,and LM2940K-15.SMD numbers are 5962-8958701YA(5V),5962-9083301YA(8V),5962-9088401YA(12V),and 5962-9088501YA(15V).
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Note 3:The maximum allowable power dissipation is a function of the maximum junction temperature,T J ,the junction-to-ambient thermal resistance,θJ−A ,and the ambient temperature,T A .Exceeding the maximum allowable power dissipation will cause excessive die temperature,and the regulator will go into thermal shutdown.The value of θJ−A (for devices in still air with no heatsink)is 60˚C/W for the TO-220package,80˚C/W for the TO-263package,and 174˚C/W for the SOT-223package.The effective value of θJ−A can be reduced by using a heatsink (see Application Hints f
or specific information on heatsinking).The values of θJ−A and θJ−C for the K02A package are 39˚C/W and 4˚C/W respectively.
Note 4:ESD rating is based on the human body model,100pF discharged through 1.5k Ω.
Note 5:All limits are guaranteed at T A =T J =25˚C only (standard typeface)or over the entire operating temperature range of the indicated device (boldface type).All limits at T A =T J =25˚C are 100%production tested.All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control methods.
Note 6:All limits are guaranteed at T A =T J =25˚C only (standard typeface)or over the entire operating temperature range of the indicated device (boldface type).All limits are 100%production tested and are used to calculate Outgoing Quality Levels.
Note 7:Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
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