STMicroelectronics L4940XX Very low drop 1.5 a regulator Datasheet

L4940xx
Very low drop 1.5 A regulator
Features
■
Precise 5, 8.5, 10, 12 V outputs
■
Low dropout voltage (450 mV typ. at 1 A)
■
Very low quiescent current
■
Thermal shutdown
■
Short circuit protection
■
Reverse polarity protection
TO-220
TO-220FP
Description
The L4940 series of three terminal positive
regulators is available in TO-220, TO-220FP and
D2PAK 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 batteries
powered equipment, reducing consumption and
Table 1.
D2PAK
prolonging battery life. Each type employs internal
current limiting, antisaturation circuit, thermal
shut-down and safe area protection.
Device summary
Order code
Part number
TO-220
L4940xx5
L4940V5
L4940xx85
L4940V85
TO-220FP
D2PAK
Output voltage
L4940D2T5-TR
5V
L4940D2T85-TR
8.5 V
L4940xx10
L4940D2T10-TR
10 V
L4940xx12
L4940D2T12-TR
12 V
February 2008
L4940P85
Rev 10
1/23
www.st.com
23
Contents
L4940xx
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Test circuits
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/23
............................................... 6
L4940xx
Block diagram
1
Block diagram
Figure 1.
Block diagram
3/23
Pin configuration
L4940xx
2
Pin configuration
Figure 2.
Pin connections (top view)
TO-220
TO-220FP
D2PAK
4/23
L4940xx
Maximum ratings
3
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
VI
VIR
Parameter
Value
Unit
30
V
VO = 5V, RO = 100Ω
-15
V
VO = 8.5V, RO = 180Ω
-15
V
VO = 10V, RO = 200Ω
-15
V
VO = 12V, RO = 240Ω
-15
V
Forward input voltage
Reverse input voltage
IO
Output current
Internally Limited
mA
PD
Power dissipation
Internally Limited
mW
Tstg
Storage temperature range
-40 to +150
°C
Top
Operating junction temperature range
-40 to +150
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3.
Thermal data
Symbol
Parameter
TO-220
TO-220FP
D2PAK
Unit
RthJC
Thermal resistance junction-case
3
5
3
°C/W
RthJA
Thermal resistance junction-ambient
50
60
62.5
°C/W
5/23
Test circuits
4
Test circuits
Figure 3.
DC parameters
Figure 4.
Load rejection
Figure 5.
Ripple rejection
6/23
L4940xx
L4940xx
Electrical characteristics
5
Electrical characteristics
Table 4.
Electrical characteristics of L4940xx5 (Refer to test circuit, VI = 7 V, CI = 0.1 µF,
CO = 22 µF, TJ = 25°C, unless otherwise specified.)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 500 mA
4.9
5
5.1
V
VO
Output voltage
IO = 5mA to 1.5A, VI = 6.5 to 15 V
4.8
5
5.2
V
VI
Input voltage
IO = 5 mA
17
V
ΔVO
Line regulation
VI = 6 to 17 V, IO = 5 mA
4
10
mV
ΔVO
IO = 5 mA to 1.5 A
8
25
mV
Load regulation
IO = 0.5 A to 1 A
5
15
mV
IO = 5 mA
5
8
mA
IO = 1.5 A, VI = 6.5 V
30
50
mA
IO = 5 mA
3
mA
IO = 1.5 A, VI = 6.5 to 16 V
15
mA
Iq
ΔIq
ΔVO/ΔT
SVR
Quiescent current
Quiescent current change
Output voltage drift
Supply voltage rejection
Vd
Dropout voltage
Isc
Short circuit current
f = 120 Hz, IO = 1 A
58
0.5
mV/°C
68
dB
IO = 0.5 A
200
400
mV
IO = 1.5 A
500
900
mV
VI = 14 V
2
2.7
VI = 6.5 V
2.2
2.9
A
7/23
Electrical characteristics
Table 5.
Symbol
L4940xx
Electrical characteristics of L4940xx85 (Refer to test circuit, VI = 10.5 V, CI = 0.1 µF,
CO = 22 µF, TJ = 25°C, unless otherwise specified.)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 500 mA
8.3
8.5
8.7
V
VO
Output voltage
IO = 5mA to 1.5A, VI = 10.2 to 15V
8.15
8.5
8.85
V
VI
Input voltage
IO = 5 mA
17
V
ΔVO
Line regulation
VI = 9.5 to 17V, IO = 5 mA
4
9
mV
ΔVO
IO = 5mA to 1.5A
12
30
mV
Load regulation
IO = 0.5A to 1A
8
16
mV
IO = 5 mA
4
8
mA
IO = 1.5A, VI = 10.2V
30
50
mA
IO = 5 mA
2.5
mA
IO = 1.5A, VI = 10.2 to 16V
15
mA
Iq
ΔIq
ΔVO/ΔT
SVR
Quiescent current
Quiescent current change
Output voltage drift
Supply voltage rejection
Vd
Dropout voltage
Isc
Short circuit current
8/23
f = 120Hz, IO = 1A
58
0.8
mV/°C
66
dB
IO = 0.5A
200
400
mV
IO = 1.5A
500
900
mV
VI = 14V
2
2.7
2.2
2.9
VI = 10.2V
A
L4940xx
Table 6.
Symbol
Electrical characteristics
Electrical characteristics of L4940xx10 (Refer to test circuit, VI = 12V, CI = 0.1 µF,
CO = 22 µF, TJ = 25°C, unless otherwise specified.)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 500 mA
9.8
10
10.2
V
VO
Output voltage
IO = 5 mA to 1.5 A, VI = 11.7 to 15 V
9.6
10
10.4
V
VI
Input voltage
IO = 5 mA
17
V
ΔVO
Line regulation
VI = 11 to 17 V, IO = 5 mA
3
8
mV
ΔVO
IO = 5 mA to 1.5 A
15
35
mV
Load regulation
IO = 0.5 A to 1 A
10
20
mV
IO = 5 mA
5
8
mA
IO = 1.5 A, VI = 11.7 V
30
50
mA
IO = 5 mA
2
mA
IO = 1.5 A, VI = 11.7 to 16 V
13
mA
Iq
ΔIq
ΔVO/ΔT
SVR
Quiescent current
Quiescent current change
Output voltage drift
Supply voltage rejection
Vd
Dropout voltage
Isc
Short circuit current
f = 120 Hz, IO = 1 A
56
1
mV/°C
62
dB
IO = 0.5 A
200
400
mV
IO = 1.5 A
500
900
mV
VI = 14 V
2
2.7
2.2
2.9
VI = 11.7 V
A
9/23
Electrical characteristics
Table 7.
Symbol
L4940xx
Electrical characteristics of L4940xx12 (Refer to test circuit, VI = 14 V, CI = 0.1 µF,
CO = 22 µF, TJ = 25°C, unless otherwise specified.)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
IO = 500 mA
11.75
12
12.25
V
VO
Output voltage
IO = 5 mA to 1.5 A, VI = 11.7 to 15 V
11.5
12
12.5
V
VI
Input voltage
IO = 5 mA
17
V
ΔVO
Line regulation
VI = 11 to 17 V, IO = 5 mA
3
7
mV
ΔVO
IO = 5 mA to 1.5 A
15
35
mV
Load regulation
IO = 0.5 A to 1 A
10
25
mV
IO = 5 mA
4
8
mA
IO = 1.5 A, VI = 11.7 V
30
50
mA
IO = 5 mA
1.5
mA
IO = 1.5 A, VI = 11.7 to 16 V
10
mA
Iq
ΔIq
ΔVO/ΔT
SVR
Quiescent current
Quiescent current change
Output voltage drift
Supply voltage rejection
55
mV/°C
61
dB
IO = 0.5 A
200
400
mV
IO = 1.5 A
500
900
mV
Short circuit current
VI = 14 V
2
2.7
A
Output impedance
f = 120 Hz, IO = 0.5 A
40
Vd
Dropout voltage
Isc
ZO
10/23
f = 120 Hz, IO = 1 A
1.2
mΩ
L4940xx
Typical application
6
Typical application
Figure 6.
Dropout voltage vs output current
Figure 7.
Dropout voltage vs temperature
Figure 8.
Output voltage vs temperature
(L4940V5)
Figure 9.
Output voltage vs temperature
(L4940V85)
Figure 10. Output voltage vs temperature
(L4940V10)
Figure 11. Output voltage vs temperature
(L4940V12)
11/23
Typical application
Figure 12. Quiescent current vs temperature
(L4940V5)
L4940xx
Figure 13. Quiescent current vs input voltage
(L4940V5)
Figure 14. Quiescent current vs output current Figure 15. Short circuit current vs temperature
(L4940V5)
(L4940V5)
Figure 16. Peak output current vs input/output Figure 17. Low voltage behavior (L4940V5)
differential voltage (L4940V5)
12/23
L4940xx
Typical application
Figure 18. Low voltage behavior (L4940V85)
Figure 19. Low voltage behavior (L4940V10)
Figure 20. Low voltage behavior (L4940V12)
Figure 21. Supply voltage rejection vs
frequency (L4940V5)
Figure 22. Supply voltage rejection vs output
current (L4940V5)
Figure 23. Lad dump characteristics
(L4940V5)
13/23
Typical application
Figure 24. Line transient response (L4940V5)
Figure 26. Load transient response
14/23
L4940xx
Figure 25. Total power dissipation
L4940xx
7
Schematic application
Schematic application
Figure 27. Distributed supply with On-card L4940 and L4941 low drop regulator
Figure 28. Distributed supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OF THESE APPLICATION ARE:
On card regulation with short-circuit and thermal protection on each output.
Vary high total system efficiency due to the switching pre-regulation and very low-drop post-regulation.
15/23
Schematic application
Figure 29. 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 efficiency on the 12 V output due to the low drop regulator
16/23
L4940xx
L4940xx
8
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
17/23
Package mechanical data
L4940xx
TO-220 mechanical data
Dim.
mm.
Min.
Typ.
inch.
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
0.70
0.019
0.027
D1
E
1.27
0.49
0.050
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
P011C
18/23
L4940xx
Package mechanical data
TO-220FP mechanical data
Dim.
mm.
Min.
Max.
Min.
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
Typ
inch.
16
Typ.
Max.
0.630
L3
28.6
30.6
1.126
1.204
L4
9.8
10.6
0.385
0.417
L5
2.9
3.6
0.114
0.142
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
7012510A-H
19/23
Package mechanical data
L4940xx
D2PAK mechanical data
mm.
inch.
Dim.
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
10.4
0.393
D1
E
8
10
E1
0.315
8.5
0.409
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
R
V2
0.4
0°
0.126
0.016
8°
0°
8°
P011P6G
20/23
L4940xx
Package mechanical data
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
180
13.0
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
14.4
0.519
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
21/23
Revision history
L4940xx
9
Revision history
Table 8.
Document revision history
Date
Revision
04-Feb-2005
6
Add new package D2PAK/A.
18-Sep-2006
7
Order codes has been updated and new template.
31-May-2007
8
Order codes has been updated.
19-Sep-2007
9
Add Table 1 in cover page.
20-Feb-2008
10
Modified: Table 1 on page 1.
22/23
Changes
L4940xx
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23/23