UNISONIC TECHNOLOGIES CO., LTD
LM2940
1A LOW-DROPOUT POSITIVE
VOLTAGE REGULATOR
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
1
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).
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
Package
SOT-223
TO-220
TO-220F
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
Tube
Tape Reel
Tape Reel
Tube
Tape Reel
Tube
Ordering Number
Lead Free
Halogen Free
-
LM2940G-xx-AA3-R
LM2940L-xx-TA3-T
LM2940G-xx-TA3-T
LM2940L-xx-TF3-T
LM2940G-xx-TF3-T
LM2940L-xx-TN3-R
LM2940G-xx-TN3-R
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
Notes: 1. xx: Output Voltage, refer to Marking Information.
2. Pin Assignment: I: V
IN
G: GND O:V
OUT
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QW-R102-016.N
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
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QW-R102-016.N
LM2940
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Power Dissipation
Junction Temperature
Ambient Operating
Temperature
TO-220/TO-220F
TO-263-3/TO-263
SOT-223/ TO-252
SYMBOL
V
IN
P
D
T
J
T
OPR
LINEAR INTEGRATED CIRCUIT
RATINGS
26
Internally limited
+150
-40 ~ +125
UNIT
V
C
C
-40 ~ +85
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
SYMBOL
θ
JA
RATING
174
60
80
125
4
θ
JC
6
12
15
C/W
UNIT
C/W
PARAMETER
SOT-223
TO-220/TO-220F
Junction to Ambient
TO-263/TO-263-3
TO-252
TO-220/TO-263
TO-263-3
TO-220F
Junction to Case
TO-252
SOT-223
ELECTRICAL CHARACTERISTICS
(T
A
=T
J
=25C, 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 20mA
RMS
, f
O
=120Hz
Quiescent Current
I
Q
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Output Noise Voltage
e
N
10Hz-100kHz, I
OUT
=5mA
Ripple Rejection
RR
f
O
=120Hz, 1V
RMS
, 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
V
TRRI
R
OUT
=100Ω, T
≤
100ms
Input Voltage
MIN
4.85
54
60
-15
-50
TYP
5.00
20
35
35
10
150
72
20
0.5
0.13
2.5
75
-30
-75
MAX
5.15
50
50
15
UNIT
V
mV
mV
mΩ
mA
μV
RMS
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
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QW-R102-016.N
LM2940
ELECTRICAL CHARACTERISTICS(Cont.)
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
R
OUT
I
Q
e
N
RR
V
D
For LM2940-6.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
7.5V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤
1A
100 mA DC and 20mA
RMS
, f
O
=120Hz
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
f
O
=120Hz, 1V
RMS
, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
MIN
5.82
60
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
For LM2940-8.0V
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
9.4V
≤
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 20mA
RMS
, f
O
=120Hz
Quiescent Current
I
Q
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Output Noise Voltage
e
N
10Hz-100kHz, I
OUT
=5mA
Ripple Rejection
RR
f
O
=120Hz, 1V
RMS
, 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 LM2940-9.0V
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
10.5V
≤
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 20mA
RMS
, f
O
=120Hz
Quiescent Current
I
Q
V
OUT
+2V
≤
VIN
≤
26V, I
OUT
=5mA
Output Noise Voltage
e
N
10Hz-100kHz, I
OUT
=5mA
Ripple Rejection
RR
f
O
=120Hz, 1V
RMS
, 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
60
-15
-50
MIN
7.76
TYP
6.00
20
40
40
10
180
72
20
0.5
0.13
2.5
75
-30
-75
TYP
8.00
20
55
55
10
240
66
32
0.5
0.13
2.5
75
-30
-75
TYP
9.00
20
60
60
10
270
64
34
0.5
0.13
2.5
75
-30
-75
MAX
6.18
60
60
15
UNIT
V
mV
mV
mΩ
mA
μV
RMS
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
MAX
8.24
80
80
15
54
UNIT
V
mV
mV
mΩ
mA
μV
RMS
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
60
-15
-50
MIN
8.73
MAX
9.27
90
90
15
52
UNIT
V
mV
mV
mΩ
mA
μV
RMS
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
4 of 12
60
-15
-50
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
QW-R102-016.N
LM2940
ELECTRICAL CHARACTERISTICS(Cont.)
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
R
OUT
I
Q
e
N
RR
V
D
For LM2940-10V
PARAMETER
Output Voltage
Line regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Ripple Rejection
Long Term Stability
Dropout Voltage
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
11.5V
≤
V
IN
≤
26V, 5mA
≤
I
OUT
≤
1A
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
50mA
≤
I
OUT
≤
1A
100mA DC and 20mA
RMS
, f
O
=120Hz
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
10Hz-100kHz, I
OUT
=5mA
f
O
=120Hz, 1V
RMS
, I
OUT
=100mA
I
OUT
=1A
I
OUT
=100mA
(Note)
R
OUT
=100Ω, T
≤
100ms
R
OUT
=100Ω
MIN
9.70
51
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
UTC LM2940-12V
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
V
OUT
13.6V
≤
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
100mA DC and 20mA
RMS
, f
O
=120Hz
Quiescent Current
I
Q
V
OUT
+2V
≤
V
IN
≤
26V, I
OUT
=5mA
Output Noise Voltage
e
N
10Hz-100kHz, I
OUT
=5mA
Ripple Rejection
RR
f
O
=120Hz, 1V
RM
s, 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
60
-15
-50
MIN
11.64
TYP
10.00
20
65
65
10
300
63
36
0.5
0.13
2.5
75
-30
-75
TYP
12.00
20
55
80
10
360
66
48
0.5
0.11
2.5
75
-30
-75
MAX
10.30
100
100
15
UNIT
V
mV
mV
mΩ
mA
μV
RMS
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
MAX
12.36
120
120
15
54
UNIT
V
mV
mV
mΩ
mA
μV
RMS
dB
mV/1000Hr
0.8
0.15
V
A
V
V
V
60
-15
-50
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QW-R102-016.N
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