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 temperature range.Furthermore,a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input volt-age 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 30mA.Higher quiescent currents 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-ver 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-rtion.Familiar regulator features such as short circuit and thermal overlo
ad 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 asmbly n Rever battery protection
n Internal short circuit current limit n Mirror image inrtion protection n
硬笔楷书作品
P +Product Enhancement tested
Typical Application
00882203
*Required if regulator is located far from power supply filter.
**C OUT must be at least 22µF to maintain stability.May be incread without bound to maintain regulation during transients.Locate as clo as possible to the regulator.This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical;e curve.
Ordering Information
Temperature Range Output Voltage
Package 5.0
8.0
9.0
10
12
15
0˚C ≤T J ≤125˚C LM2940CT-5.0LM2940CT-9.0LM2940CT-12LM2940CT-15TO-220LM2940CS-5.0LM2940CS-9.0LM2940CS-12LM2940CS-15TO-263−40˚C ≤T J ≤125˚C
LM2940LD-5.0
LM2940LD-8.0
LM2940LD-9.0
LM2940LD-10
LM2940LD-12
LM2940LD-15
LLP 1k Units
Tape and Reel LM2940LDX-5.0LM2940LDX-8.0LM2940LDX-9.0LM2940LDX-10LM2940LDX-12LM2940LDX-15
LLP 4.5k Units
Tape and Reel −40˚C ≤T J ≤125˚C LM2940T-5.0LM2940T-8.0LM2940T-9.0LM2940T-10LM2940T-12TO-220LM2940S-5.0LM2940S-8.0LM2940S-9.0LM2940S-10LM2940S-12TO-263
−40˚C ≤T J ≤85˚C
LM2940IMP-5.0
LM2940IMP-8.0
LM2940IMP-9.0
LM2940IMP-10
LM2940IMP-12
LM2940IMP-15
SOT-223LM2940IMPX-5.0LM2940IMPX-8.0LM2940IMPX-9.0LM2940IMPX-10LM2940IMPX-12LM2940IMPX-15
车经纪SOT-223in Tape and Reel
SOT-223Package Marking
L53B L54B L0EB L55B L56B L70B
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.
讲诚信的成语
January 2003
LM2940/LM2940C 1A Low Dropout Regulator
Ordering Information
(Continued)
Temperature Range
Output Voltage Package
5.0
8.0
12
15
−55˚C ≤T J ≤125˚C
LM2940J-5.0/8835962-8958701EA LM2940J-8.0/8835962-9088301QEA
LM2940J-12/8835962-9088401QEA
LM2940J-15/8835962-9088501QEA
J16A LM2940WG5.0/8835962-8958701XA
WG16A For information on military temperature range products,plea go to the Mil/Aero Web Site at /appinfo/milaero/index.html.
Connection Diagrams
(TO-220)Plastic Package
3-Lead SOT-223
00882202
Front View
Order Number LM2940CT-5.0,LM2940CT-9.0,LM2940CT-12,LM2940CT-15,LM2940T-5.0,
LM2940T-8.0,LM2940T-9.0,LM2940T-10or LM2940T-12See NS Package Number TO3B
00882242
Front View
Order Part Number LM2940IMP-5.0,LM2940IMP-8.0,LM2940IMP-9.0,
LM2940IMP-10,LM2940IMP-12or LM2940IMP-15
See NS Package Number MP04A
16-Lead Dual-in-Line Package (J)
00882243Top View
Order Number LM2940J-5.0/883(5962-8958701EA),
LM2940J-8.0/883(5962-9088301QEA),LM2940J-12/883(5962-9088401QEA),LM2940J-15/883(5962-9088501QEA)See NS Package Number J16A
16-Lead Ceramic Surface-Mount Package (WG)
00882244
Top View
Order Number LM2940WG5.0/883(5962-8958701XA)
See NS Package Number WG16A
L M 2940/L M 2940C
Connection Diagrams(Continued)
(TO-263)Surface-Mount Package
00882211
Top View
8-Lead LLP
00882246
Top View
Order Number LM2940LD-5.0,LM2940LD-8.0,
LM2940LD-9.0,LM2940LD-10,
LM2940LD-12,LM2940LD-15
See NS Package Number LDC08A
Pin2and pin7are fud to center DAP
Pin5ans6need to be tied together on PCB board
00882212
Side View
Order Number LM2940CS-5.0,LM2940CS-9.0,
LM2940CS-12,LM2940CS-15,
清运垃圾
LM2940S-5.0,LM2940S-8.0,
LM2940S-9.0,LM2940S-10or LM2940S-12
See NS Package Number TS3B
LM2940/LM2940C
Absolute Maximum Ratings
(Note 1)If Military/Aerospace specified devices are required,plea contact the National Semiconductor Sales Office/Distributors for availability and specifications.LM2940S,T,MP ≤100ms 60V LM2940CS,T ≤1ms 45V
Internal Power Dissipation (Note 2)
Internally Limited
Maximum Junction Temperature 150˚C
Storage Temperature Range −65˚C ≤T J ≤+150˚C
Lead Temperature,Time for Wave Soldering
TO-220(T)Package 260˚C,10s TO-263(S)Package
260˚C,4s
SOT-223(MP)Package 260˚C,4s
ESD Susceptibility (Note 3)
2kV
Operating Conditions (Note 1)
Input Voltage 26V
Temperature Range LM2940T,LM2940S −40˚C ≤T J ≤125˚C LM2940CT,LM2940CS 0˚C ≤T J ≤125˚C LM2940IMP
−40˚C ≤T J ≤85˚C LM2940J,LM2940WG −55˚C ≤T J ≤125˚C LM2940LD
−40˚C ≤T J ≤125˚C
Electrical Characteristics
V IN =V O +5V,I O =1A,C O =22µF,unless otherwi 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 4)
(Note 5)(Note 4)(Note 5)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
c6h8o7
80
最简单的折纸大全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梦见喂猫
15/20
15/20
mA MAX
LM2940C 1015V IN =V O +5V,30
45/60
50/60
30
45/60
50/60
mA MAX
I O =1A
Output Noi 10Hz −100kHz,150
700/700
240
1000/1000
µV rms
Voltage I O =5mA
Ripple Rejection
f O =120Hz,1V rms ,I O =100mA LM29407260/546654/48dB MIN
LM2940C
72
60
66
54
f O =1kHz,1V rms ,60/50
54/48
dB MIN I O =5mA
Long Term 20
32
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 Current
(Note 6)
1.9
1.6
1.5/1.3
1.9
众所周知用英语怎么说1.6
1.6/1.3
A MIN
L M 2940/L M 2940C
Electrical Characteristics
(Continued)
V IN =V O +5V,I O =1A,C O =22µF,unless otherwi 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 4)
(Note 5)
(Note 4)(Note 5)
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
55455545Rever Polarity R O =100Ω
DC Input Voltage LM2940,LM2940/883−30−15/−15−15/−15
−30−15/−15−15/−15
V MIN
LM2940C −30−15−30−15Rever 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 otherwi 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
LM2940
Limit Limit (Note 4)
(Note 4)
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
20
100
mV MAX I O =5mA Load Regulation
50mA ≤I O ≤1A LM29406090/15065100/165
mV MAX
LM2940C
6090
Output Impedance
100mADC and 20mArms,60
65m Ω
f O =120Hz
Quiescent V O +2V ≤V IN <26V,Current
I O =5mA LM29401015/201015/20mA MAX LM2940C
1015V IN =V O +5V,I O =1A
3045/60
3045/60
mA MAX Output Noi 10Hz −100kHz,270
300
µV rms
Voltage I O =5mA
Ripple Rejection
f O =120Hz,1V rms ,I O =100mA LM29406452/466351/45
dB MIN LM2940C
6452
Long Term Stability 3436
mV/1000Hr
Dropout Voltage
I O =1A 0.50.8/1.00.50.8/1.0V MAX I O =100mA
110
150/200
110
150/200
mV MAX
LM2940/LM2940C
