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
*Pb-free plating product number: LM2940L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
LM2940-xx-AA3-D-R
LM2940L-xx-AA3-D-R
LM2940-xx-D16-T
LM2940L-xx-D16-T
LM2940-xx-S16-R
LM2940L-xx-S16-R
LM2940-xx-S16-T
LM2940L-xx-S16-T
LM2940-xx-TA3-D-T
LM2940L-xx-TA3-D-T
LM2940-xx-TN3-D-R
LM2940L-xx-TN3-D-R
LM2940-xx-TN3-D-T
LM2940L-xx-TN3-D-T
LM2940-xx-TQ2-D-R
LM2940L-xx-TQ2-D-R
LM2940-xx-TQ2-D-T
LM2940L-xx-TQ2-D-T
LM2940-xx-TQ3-D-R
LM2940L-xx-TQ3-D-R
LM2940-xx-TQ3-D-T
LM2940L-xx-TQ3-D-T
Note: 1.xx: output voltage, refer to Marking Information.
2.Pin Assignment: I: V
IN
G: GND O:V
OUT
Package
SOT-223
DIP-16
SOP-16
SOP-16
TO-220
TO-252
TO-252
TO-263
TO-263
TO-263-3
TO-263-3
Pin Assignment
1
2
3
I
G
O
Refer to Pin
Configurations
I
I
I
I
I
I
I
G
G
G
G
G
G
G
O
O
O
O
O
O
O
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QW-R102-016.C
LM2940
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
LINEAR INTEGRATED CIRCUIT
MARKING
SOT-223
05
08
09
10
12
15
: 5V
: 8V
: 9V
:10V
:12V
:15V
TO-220
TO-252
TO-263
TO-263-3
PIN CONFIGURATIONS FOR DIP-16 AND SOP-16
V
IN
16
NC
15
GND
14
GND
13
GND
12
GND
11
NC
10
NC
9
1
NC
2
NC
3
V
OUT
4
NC
5
GND
6
NC
7
NC
8
NC
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QW-R102-016.C
LM2940
ABSOLUTE MAXIMUM RATINGS
PARAMETER
LINEAR INTEGRATED CIRCUIT
RATINGS
UNIT
Input Voltage
26
V
Power Dissipation
Internally limited
Junction Temperature
+150
°C
TO-220/TO-263-3/TO-263
-40 ~ +125
°C
Operating Temperature
T
OPR
SOT-223
-40 ~ +85
°C
DIP/SOP
-55 ~ +125
°C
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.
SYMBOL
V
IN
P
D
T
J
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
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
V
D
I
SC
T
IN
V
RIN
V
TRRI
I
OUT
=1A
I
OUT
=100mA
(Note)
Ro=100Ω, T
≤
100ms
Ro=100Ω
Ro=100Ω, T
≤
100ms
SYMBOL
V
OUT
△V
OUT
△V
OUT
Ro
I
Q
eN
RR
TEST CONDITIONS
6.25V
≤
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
V
IN
= V
OUT
+5V, I
OUT
=1A
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
MIN
4.85
TYP
5.00
20
35
35
10
30
150
72
20
0.5
0.11
1.9
75
-30
-75
0.8
0.15
MAX
5.15
50
50
15
45
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/
1000Hr
V
A
V
V
V
60
1.6
60
-15
-50
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
V
D
I
SC
T
IN
V
RIN
V
TRRI
I
OUT
=1A
I
OUT
=100mA
(Note)
Ro=100Ω, T
≤
100ms
Ro=100Ω
Ro=100Ω, T
≤
100ms
SYMBOL
V
OUT
△V
OUT
△V
OUT
Ro
I
Q
eN
RR
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
V
IN
= V
OUT
+5V, I
OUT
=1A
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
MIN
7.76
TYP
8.00
20
55
55
10
30
240
66
32
0.5
0.11
1.9
75
-30
-75
0.8
0.15
MAX
8.24
80
80
15
45
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/
1000Hr
V
A
V
V
V
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54
1.6
60
-15
-50
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LM2940
ELECTRICAL CHARACTERISTICS(Cont.)
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
V
D
I
SC
T
IN
V
RIN
V
TRRI
I
OUT
=1A
I
OUT
=100mA
(Note)
Ro=100Ω, T
≤
100ms
Ro=100Ω
Ro=100Ω, T
≤
100ms
SYMBOL
V
OUT
△V
OUT
△V
OUT
Ro
I
Q
eN
RR
LINEAR INTEGRATED CIRCUIT
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
V
IN
= V
OUT
+5V, I
OUT
=1A
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
MIN
8.73
52
TYP
9.00
20
60
60
10
30
270
64
34
0.5
0.11
1.9
75
-30
-75
MAX
9.27
90
90
15
45
UNIT
V
mV
mV
mΩ
mA
μVrms
dB
mV/
1000Hr
0.8
0.15
V
A
V
V
V
1.6
60
-15
-50
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
V
D
I
SC
T
IN
V
RIN
V
TRRI
I
OUT
=1A
I
OUT
=100mA
(Note)
Ro=100Ω, T
≤
100ms
Ro=100Ω
Ro=100Ω, T
≤
100ms
SYMBOL
V
OUT
△V
OUT
△V
OUT
Ro
I
Q
eN
RR
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
V
IN
= V
OUT
+5V, I
OUT
=1A
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
MIN
9.70
TYP MAX UNIT
10.00 10.30
V
20
100
mV
65
100
mV
65
mΩ
10
15
mA
30
45
300
μVrms
63
dB
mV/
36
1000Hr
0.5
0.8
V
0.11 0.15
1.9
A
75
V
-30
V
-75
V
51
1.6
60
-15
-50
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QW-R102-016.C
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
V
D
I
SC
T
IN
V
RIN
V
TRRI
I
OUT
=1A
I
OUT
=100mA
(Note)
Ro=100Ω, T
≤
100ms
Ro=100Ω
Ro=100Ω, T≤100ms
SYMBOL
V
OUT
△V
OUT
△V
OUT
Ro
I
Q
eN
RR
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
V
IN
= V
OUT
+5V, I
OUT
=1A
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
MIN
TYP MAX UNIT
11.64 12.00 12.36
V
20
120
mV
55
120
mV
80
mΩ
10
15
mA
30
45
360
μVrms
54
66
dB
mV/
48
1000Hr
0.5
0.8
V
0.11 0.15
1.6
1.9
A
60
75
V
-15
-30
V
-50
-75
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
V
D
I
OUT
=1A
I
OUT
=100mA
(Note)
Ro=100Ω, T
≤
100ms
Ro=100Ω
SYMBOL
V
OUT
△V
OUT
△V
OUT
Ro
I
Q
eN
RR
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
V
IN
= V
OUT
+5V, I
OUT
=1A
10Hz-100kHz, I
OUT
=5mA
fo=120Hz, 1Vrms, I
OUT
=100mA
MIN
TYP MAX UNIT
14.55 15.00 15.45
V
20
150
mV
70
150
mV
100
mΩ
10
15
mA
30
45
450
μVrms
52
64
dB
mV/
60
1000Hr
0.5
0.8
V
0.11 0.15
1.6
1.9
A
60
75
V
-15
-30
V
V
-50
-75
Short Circuit Current
I
SC
Maximum Line Transient
T
IN
Reverse Polarity DC Input Voltage
V
RIN
Reverse Polarity Transient Input
V
TRRI
Ro=100Ω, T
≤
100ms
Voltage
Note: Output current will decrease with temperature increase but will not drop below 1A at the maximum specified
temperature.
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QW-R102-016.C
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