UNISONIC TECHNOLOGIES CO., LTD
LM2940
1A LOW-DROPOUT POSITIVE
VOLTAGE REGULATOR
DESCRIPTION
The UTC
LM2940
is a low dropout regulator designed to
provide output current up to 1A with a typically 500mV dropout
Voltage and a maximum of 1V. It is capable of reducing the
ground current when the differential between the input voltage
and the output voltage outrun 3V.
UTC
LM2940
offers low quiescent current (typically 30mA at 1A
and an input-output differential of 5V). Higher quiescent currents
only exist when the regulator is in the dropout mode
(V
IN
-V
OUT
≤3V).
LINEAR INTEGRATED CIRCUIT
1
FEATURES
* 500mV Typically Dropout at 1A
* Output Current in Excess of 1A
* Low Quiescent Current
* Reversed-Battery Protection
* Current Limit and Thermal Shutdown.
* Mirror Image Insertion Protection
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LM2940L-xx-AA3-R
LM2940G-xx-AA3-R
LM2940L-xx-TA3-T
LM2940G-xx-TA3-T
LM2940L-xx-TN3-R
LM2940G-xx-TN3-R
LM2940L-xx-TN3-T
LM2940G-xx-TN3-T
LM2940L-xx-TQ2-R
LM2940G-xx-TQ2-R
LM2940L-xx-TQ2-T
LM2940G-xx-TQ2-T
LM2940L-xx-TQ3-R
LM2940G-xx-TQ3-R
LM2940L-xx-TQ3-T
LM2940G-xx-TQ3-T
Note: 1.xx: Output Voltage, refer to Marking Information.
2.Pin Assignment: I: V
IN
G: GND O:V
OUT
Package
SOT-223
TO-220
TO-252
TO-252
TO-263
TO-263
TO-263-3
TO-263-3
Pin Assignment
1
2
3
I
G
O
I
G
O
I
G
O
I
G
O
I
G
O
I
G
O
I
G
O
I
G
O
Packing
Tape Reel
Tube
Tape Reel
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QW-R102-016.J
LM2940
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
LINEAR INTEGRATED CIRCUIT
MARKING
SOT-223
TO-220
TO-252
TO-263
TO-263-3
50 : 5V
60 : 6V
80 : 8V
90 : 9V
10 :10V
12 :12V
15 :15V
Voltage Code
Lot Code
UTC
LM2940
L: Lead Free
G: Halogen Free
Date Code
1
2
3
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QW-R102-016.J
LM2940
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
V
IN
P
D
T
J
LINEAR INTEGRATED CIRCUIT
RATINGS
UNIT
Input Voltage
26
V
Power Dissipation
Internally limited
Junction Temperature
+150
°C
Ambient Operating
TO-220/TO-263-3/TO-263
-40 ~ +125
°C
T
OPR
Temperature
-40 ~ +85
°C
SOT-223
Storage Temperature
T
STG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SOT-223
Junction to Ambient
TO-220
TO-263/TO-263-3
TO-220
Junction to Case
TO-263/TO-263-3
SYMBOL
θ
JA
θ
JC
RATING
174
60
80
4
4
UNIT
°C/W
°C/W
ELECTRICAL CHARACTERISTICS
(T
a
=T
J
=25°C, V
IN
=V
OUT
+5V, I
OUT
=1A and C
OUT
=22μF, unless otherwise specified.)
For LM2940-5.0V
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
6.25V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
Line Regulation
△V
OUT
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Load Regulation
△V
OUT
50mA
≤
I
OUT
≤
1A
Output Impedance
R
OUT
100 mA DC and 20mArms, fo=120Hz
Quiescent Current
I
Q
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Output Noise Voltage
eN
10Hz-100kHz, I
OUT
=5mA
Ripple Rejection
RR
fo=120Hz, 1Vrms, I
OUT
=100mA
Long Term Stability
I
OUT
=1A
Dropout Voltage
V
D
I
OUT
=100mA
Short Circuit Current
I
SC
(Note)
Maximum Line Transient
T
IN
R
OUT
=100Ω, T
≤
100ms
Reverse Polarity DC Input Voltage
V
RIN
R
OUT
=100Ω
Reverse Polarity Transient Input
V
TRRI
R
OUT
=100Ω, T
≤
100ms
Voltage
For LM2940-6.0V
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
7.5V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
Line Regulation
△V
OUT
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Load Regulation
△V
OUT
50mA
≤
I
OUT
≤
1A
Output Impedance
R
OUT
100 mA DC and 20mArms, fo=120Hz
Quiescent Current
I
Q
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Output Noise Voltage
eN
10Hz-100kHz, I
OUT
=5mA
Ripple Rejection
RR
fo=120Hz, 1Vrms, I
OUT
=100mA
Long Term Stability
I
OUT
=1A
Dropout Voltage
V
D
I
OUT
=100mA
Short Circuit Current
I
SC
(Note)
Maximum Line Transient
T
IN
R
OUT
=100Ω, T
≤
100ms
Reverse Polarity DC Input Voltage
V
RIN
R
OUT
=100Ω
Reverse Polarity Transient Input
V
TRRI
R
OUT
=100Ω, T
≤
100ms
Voltage
MIN
4.85
54
60
-15
-50
MIN
5.82
TYP
5.00
20
35
35
10
150
72
20
0.5
0.13
2.5
75
-30
-75
TYP
6.00
20
40
40
10
180
72
20
0.5
0.13
2.5
75
-30
-75
MAX
5.15
50
50
15
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
MAX
6.18
60
60
15
60
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
3 of 11
60
-15
-50
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
QW-R102-016.J
LM2940
ELECTRICAL CHARACTERISTICS(Cont.)
For LM2940-8.0V
PARAMETER
Output Voltage
Line regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
Short Circuit Current
Maximum Line Transient
Reverse Polarity DC Input Voltage
Reverse Polarity Transient Input
Voltage
For LM2940-9.0V
PARAMETER
Output Voltage
Line regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
Short Circuit Current
Maximum Line Transient
Reverse Polarity DC Input Voltage
Reverse Polarity Transient Input
Voltage
For LM2940-10V
PARAMETER
Output Voltage
Line regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
Short Circuit Current
Maximum Line Transient
Reverse Polarity DC Input Voltage
Reverse Polarity Transient Input
Voltage
SYMBOL
V
OUT
△V
OUT
△V
OUT
R
OUT
I
Q
eN
RR
V
D
I
SC
T
IN
V
RIN
V
TRRI
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
9.4V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤1A
100 mA DC and 20mArms, fo=120Hz
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
R
OUT
=100Ω, T
≤
100ms
MIN
7.76
54
60
-15
-50
TYP
8.00
20
55
55
10
240
66
32
0.5
0.13
2.5
75
-30
-75
MAX
8.24
80
80
15
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
SYMBOL
V
OUT
△V
OUT
△V
OUT
R
OUT
I
Q
eN
RR
V
D
I
SC
T
IN
V
RIN
V
TRRI
TEST CONDITIONS
10.5V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤
1A
100 mA DC and 20mArms, fo=120Hz
V
OUT
+2V
≤
VIN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
R
OUT
=100Ω, T
≤
100ms
MIN
8.73
52
60
-15
-50
TYP
9.00
20
60
60
10
270
64
34
0.5
0.13
2.5
75
-30
-75
MAX
9.27
90
90
15
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
SYMBOL
V
OUT
△V
OUT
△V
OUT
R
OUT
I
Q
eN
RR
V
D
I
SC
T
IN
V
RIN
V
TRRI
TEST CONDITIONS
11.5V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤
1A
100 mA DC and 20mArms, fo=120Hz
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
R
OUT
=100Ω, T
≤
100ms
MIN
9.70
51
60
-15
-50
TYP
10.00
20
65
65
10
300
63
36
0.5
0.13
2.5
75
-30
-75
MAX
10.30
100
100
15
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
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QW-R102-016.J
LM2940
ELECTRICAL CHARACTERISTICS(Cont.)
UTC LM2940-12V
PARAMETER
Output Voltage
Line regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
Short Circuit Current
Maximum Line Transient
Reverse Polarity DC Input Voltage
Reverse Polarity Transient Input
Voltage
SYMBOL
V
OUT
△V
OUT
△V
OUT
R
OUT
I
Q
eN
RR
V
D
I
SC
T
IN
V
RIN
V
TRRI
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
13.6V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤
1A
100 mADC and 20mArms, fo=120Hz
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
R
OUT
=100Ω, T
≤
100ms
MIN
11.64
54
60
-15
-50
TYP
12.00
20
55
80
10
360
66
48
0.5
0.11
2.5
75
-30
-75
MAX
12.36
120
120
15
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
UTC LM2940-15V
PARAMETER
Output Voltage
Line regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
SYMBOL
V
OUT
△V
OUT
△V
OUT
R
OUT
I
Q
eN
RR
V
D
TEST CONDITIONS
16.75V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤
1A
100 mADC and 20mArms, fo=120Hz
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
MIN
14.55
TYP
15.00
20
70
100
10
450
64
60
0.5
0.11
2.5
75
-30
-75
MAX
15.45
150
150
15
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/1000Hr
52
0.8
0.15
V
A
V
V
V
Short Circuit Current
I
SC
Maximum Line Transient
T
IN
Reverse Polarity DC Input Voltage
V
RIN
Reverse Polarity Transient Input
V
TRRI
R
OUT
=100Ω, T
≤
100ms
Voltage
Note: Output current will decrease with temperature increase but will not drop below
temperature.
60
-15
-50
1A at the maximum specified
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QW-R102-016.J
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