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1/16
February 2003
s
PRECISE 5, 8.5, 10, 12V OUTPUTS
s
LOW DROPOUT VOLTAGE (500mV Typ. at
1.5A)
s
VERY LOW QUIESCENT CURRENT
s
THERMAL SHUTDOWN
s
SHORT CIRCUIT PROTECTION
s
REVERSE POLARITY PROTECTION
DESCRIPTION
The L4940 series of three terminal positive
regulators is available in TO-220, TO-220FP and
D
2
PAK packages and with several fixed output
voltages, making it useful in a wide range of
industrial and consumer applications. Thanks to
its very low input/output voltage drop, these
devices
are
particularly
suitable
for
battery
powered equipments, reducing consumption and
prolonging battery life. Each type employs internal
current limiting, antisaturation circuit, thermal
shut-down and safe area protection.
L4940
SERIES
VERY LOW DROP 1.5A REGULATORS
BLOCK DIAGRAM
TO-220
D
2
PAK
TO-220FP
L4940 SERIES
2/16
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
CONNECTION DIAGRAM (top view)
ORDERING CODES
(*) Available in Tape & Reel with the suffix "-TR".
Symbol
Parameter
Value
Unit
V
I
Forward Input Voltage
30
V
V
IR
Reverse Input Voltage
V
O
=5V
R
O
=100
-15
V
V
O
=8.5V R
O
=180
-15
V
V
O
=10V
R
O
=200
-15
V
V
O
=12V
R
O
=240
-15
V
I
O
Output Current
Internally Limited
mA
P
D
Power Dissipation
Internally Limited
mW
T
stg
Storage Temperature Range
-40 to +150
C
T
op
Operating Junction Temperature Range
-40 to +150
C
Symbol
Parameter
TO-220
TO-220FP
D
2
PAK
Unit
R
thj-case
Thermal Resistance Junction-case
3
5
3
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
60
62.5
C/W
TO-220
TO-220FP
D
2
PAK
TO-220
TO-220FP
D
2
PAK (*)
OUTPUT VOLTAGE
L4940V5
L4940P5
L4940D2T5
5 V
L4940V85
L4940P85
L4940D2T85
8.5 V
L4940V10
L4940P10
L4940D2T10
10 V
L4940V12
L4940P12
L4940D2T12
12 V
L4940 SERIES
3/16
TEST CIRCUITS
Figure 1 : DC Parameter
Figure 2 : Load Rejection
Figure 3 : Ripple Rejection
L4940 SERIES
4/16
ELECTRICAL CHARACTERISTICS OF L4940V5 (Refer to test circuit, V
I
=7V, C
I
= 0.1
F, C
O
= 22
F,
T
J
= 25C, unless otherwise specified.)
ELECTRICAL CHARACTERISTICS OF L4940V85 (Refer to test circuit, V
I
=10.5V, C
I
= 0.1
F,
C
O
= 22
F,T
J
= 25C, unless otherwise specified.)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 500 mA
4.9
5
5.1
V
V
O
Output Voltage
I
O
= 5mA to 1.5A
V
I
= 6.5 to 15V
4.8
5
5.2
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 6 to 17V
I
O
= 5 mA
4
10
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
8
25
mV
I
O
= 0.5A to 1A
5
15
mV
I
q
Quiescent Current
I
O
= 5 mA
5
8
mA
I
O
= 1.5A
V
I
= 6.5V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
3
mA
I
O
= 1.5A
V
I
= 6.5 to 16V
15
mA
V
O
/
T Output Voltage Drift
0.5
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
58
68
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
V
I
= 6.5V
2.2
2.9
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 500 mA
8.3
8.5
8.7
V
V
O
Output Voltage
I
O
= 5mA to 1.5A
V
I
= 10.2 to 16V
8.15
8.5
8.85
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 9.5 to 17V
I
O
= 5 mA
4
9
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
12
30
mV
I
O
= 0.5A to 1A
8
16
mV
I
q
Quiescent Current
I
O
= 5 mA
4
8
mA
I
O
= 1.5A
V
I
= 10.2V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
2.5
mA
I
O
= 1.5A
V
I
= 10.2 to 16V
15
mA
V
O
/
T Output Voltage Drift
0.8
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
58
66
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
V
I
= 10.2V
2.2
2.9
L4940 SERIES
5/16
ELECTRICAL CHARACTERISTICS OF L4940V10 (Refer to test circuit, V
I
=12V, C
I
= 0.1
F,
C
O
= 22
F, T
J
= 25C, unless otherwise specified.)
ELECTRICAL CHARACTERISTICS OF L4940V12 (Refer to test circuit, V
I
=14V, C
I
= 0.1
F,
C
O
= 22
F, T
J
= 25C, unless otherwise specified.)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 500 mA
9.8
10
10.2
V
V
O
Output Voltage
I
O
= 5mA to 1.5A
V
I
= 11.7 to 15V
9.6
10
10.4
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 11 to 17V
I
O
= 5 mA
3
8
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
15
35
mV
I
O
= 0.5A to 1A
10
20
mV
I
q
Quiescent Current
I
O
= 5 mA
5
8
mA
I
O
= 1.5A
V
I
= 11.7V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
2
mA
I
O
= 1.5A
V
I
= 11.7 to 16V
13
mA
V
O
/
T Output Voltage Drift
1
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
56
62
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
V
I
= 11.7V
2.2
2.9
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 500 mA
11.75
12
12.25
V
V
O
Output Voltage
I
O
= 5mA to 1.5A
V
I
= 13.8 to 15V
11.5
12
12.5
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 13 to 17V
I
O
= 5 mA
3
7
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
15
35
mV
I
O
= 0.5A to 1A
10
25
mV
I
q
Quiescent Current
I
O
= 5 mA
4
8
mA
I
O
= 1.5A
V
I
= 13.8V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
1.5
mA
I
O
= 1.5A
V
I
= 13.8 to 16V
10
mA
V
O
/
T Output Voltage Drift
1.2
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
55
61
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
Z
O
Output Impedance
f = 120Hz
I
O
= 0.5A
40
m
L4940 SERIES
6/16
TYPICAL CHARACTERISTICS
Figure 4 : Dropout Voltage vs Output Current
Figure 5 : Dropout Voltage vs Temperature
Figure 6 : Output Voltage vs Temperature
(L4940V5)
Figure 7 : Output Voltage vs Temperature
(L4940V85)
Figure 8 : Output Voltage vs Temperature
(L4940V10)
Figure 9 : Output Voltage vs Temperature
(L4940V12)
L4940 SERIES
7/16
Figure 10 : Quiescent Current vs Temperature
(L4940V5)
Figure 11 : Quiescent Current vs Input Voltage
(L4940V5)
Figure 12 : Quiescent Current vs Output Current
(L4940V5)
Figure 13 : Short Circuit Current vs Temperature
(L4940V5)
Figure 14 : Peak Output Current vs Input/Output
Differential Voltage (L4940V5)
Figure 15 : Low Voltage Behavior (L4940V5)
L4940 SERIES
8/16
Figure 16 : Low Voltage Behavior (L4940V85)
Figure 17 : Low Voltage Behavior (L4940V10)
Figure 18 : Low Voltage Behavior (L4940V12)
Figure 19 : Supply Voltage Rejection vs
Frequency (L4940V5)
Figure 20 : Supply Voltage Rejection vs Output
Current (L4940V5)
Figure 21 : Lad Dump Characteristics (L4940V5)
L4940 SERIES
9/16
Figure 22 : Line Transient Response (L4940V5)
Figure 23 : Total Power Dissipation
Figure 24 : Load transient Response
L4940 SERIES
10/16
Figure 25 : Distributed Supply with On-card L4940 and L4941 low drop regulator
Figure 26 : Distributed Supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OTF THESE APPLICATION ARE:
On card regulation with short-circuit and thermal protection on each output.
Vary high total system efficency due to the switching preregulation and very low-drop postregulation
L4940 SERIES
11/16
Figure 27 : Distributed Supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OF THIS CONFIGURATION ARE:
Very high regulation (line and load on both the output voltage
12V output short circuit and thermally protected
Very high efficency on the 12 V output due to the low drop regulator
L4940 SERIES
12/16
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
D1
1.27
0.050
E
0.49
0.70
0.019
0.027
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.067
F2
1.14
1.70
0.044
0.067
G
4.95
5.15
0.194
0.203
G1
2.4
2.7
0.094
0.106
H2
10.0
10.40
0.393
0.409
L2
16.4
0.645
L4
13.0
14.0
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.2
6.6
0.244
0.260
L9
3.5
3.93
0.137
0.154
DIA.
3.75
3.85
0.147
0.151
TO-220 MECHANICAL DATA
P011C
L4940 SERIES
13/16
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.40
4.60
0.173
0.181
B
2.5
2.7
0.098
0.106
D
2.5
2.75
0.098
0.108
E
0.45
0.70
0.017
0.027
F
0.75
1
0.030
0.039
F1
1.15
1.50
0.045
0.059
F2
1.15
1.50
0.045
0.059
G
4.95
5.2
0.194
0.204
G1
2.4
2.7
0.094
0.106
H
10.0
10.40
0.393
0.409
L2
16
0.630
L3
28.6
30.6
1.126
1.204
L4
9.8
10.6
0.385
0.417
L6
15.9
16.4
0.626
0.645
L7
9
9.3
0.354
0.366
DIA.
3
3.2
0.118
0.126
TO-220FP MECHANICAL DATA
L2
A
B
D
E
H
G
L6
F
L3
G1
1 2 3
F2
F1
L7
L4
7012510/F
L4940 SERIES
14/16
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.4
4.6
0.173
0.181
A1
2.49
2.69
0.098
0.106
A2
0.03
0.23
0.001
0.009
B
0.7
0.93
0.027
0.036
B2
1.14
1.7
0.044
0.067
C
0.45
0.6
0.017
0.023
C2
1.23
1.36
0.048
0.053
D
8.95
9.35
0.352
0.368
D1
8
0.315
E
10
10.4
0.393
0.409
E1
8.5
0.335
G
4.88
5.28
0.192
0.208
L
15
15.85
0.590
0.624
L2
1.27
1.4
0.050
0.055
L3
1.4
1.75
0.055
0.068
M
2.4
3.2
0.094
0.126
R
0.4
0.016
V2
0
8
0
8
D
2
PAK MECHANICAL DATA
P011P6G
L4940 SERIES
15/16
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
180
7.086
C
12.8
13.0
13.2
0.504
0.512
0.519
D
20.2
0.795
N
60
2.362
T
14.4
0.567
Ao
10.50
10.6
10.70
0.413
0.417
0.421
Bo
15.70
15.80
15.90
0.618
0.622
0.626
Ko
4.80
4.90
5.00
0.189
0.193
0.197
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
11.9
12.0
12.1
0.468
0.472
0.476
Tape & Reel D
2
PAK-P
2
PAK-D
2
PAK/A-P
2
PAK/A MECHANICAL DATA
L4940 SERIES
16/16
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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