STMicroelectronics LM2931 Datasheet
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LM2931
Datasheet
Very low drop voltage regulators with inhibit function
DPAK
SO-8
Maturity status link
LM2931
TO-92
Features
• AEC-Q100 qualified (DPAK only)
• Very low dropout voltage (90 mV typ. at 10 mA load)
• Low quiescent current (typ. 2.5 mA, at 100 mA load)
• Output current up to 100 mA
• Adjustable (from V
OUT
= 2.5 V only SO-8) and fixed (3.3 V and 5 V) output voltage version
• Internal current and thermal limit
• Load dump protection up to 60 V
• Reverse transient protection up to - 50 V
• Temperature range: - 40 to 125 °C
• Package available: TO-92, DPAK, SO-8 (with inhibit control)
Description
The LM2931 are very low drop regulators. The very low drop voltage and the low quiescent current make them particular suitable for low noise, low power applications and in battery-powered systems. In the 8-pin configuration (SO-8), fully compatible with the older L78L family, a shutdown logic control function is available. This means that when the device is used as a local regulator it is possible to put a part of the board in standby, decreasing total power consumption. Ideal for automotive applications, LM2931 is protected from reverse battery installations or 2 battery jumps. During the transient, such as a 60 V load dump, when the input voltage can exceed the specified maximum operating input voltage of 26 V, the regulator automatically shuts down to protect both internal circuitry and the load.
DS1760 - Rev 23 - February 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
1
Diagram
Figure 2. Schematic diagram
LM2931
Diagram
AMG110720161100MT
DS1760 - Rev 23 page 2/26
LM2931
Pin configuration
2
Pin configuration
Figure 3. Pin connections (top view)
GND
Note:
DPAK
TO-92
P IN 1 = V
OUT
P IN 2 = GND
P IN 3 = V
IN
BOTTOM VIEW
(*) ADJ pin on the adjustable version, not connected in the fixed output version.
SO-8
AMG110720161101MT
DS1760 - Rev 23 page 3/26
LM2931
Maximum ratings
3
Maximum ratings
Symbol
V
INH
I
O
T
STG
T
OP
V
I
V
I
V
I
V
I
Table 1. Absolute maximum ratings
Parameter
DC positive input voltage
DC reverse input voltage
Transient input voltage (Ƭ < 100 ms)
Transient reverse input voltage (Ƭ < 100 ms)
Inhibit input voltage
Output current
Storage temperature range
Operating junction temperature range
Value
40
-15
60
-50
40
Internally limited
-65 to 150
-40 to 125
V
V
V
Unit
V
V
°C
°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 2. Thermal data
Symbol
R thJC
R thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
1. Considering 6 cm 2 of copper board heat-sink.
SO-8
20
DPAK
8
100
TO-92
57
200
Unit
°C/W
°C/W
DS1760 - Rev 23 page 4/26
4
Application circuits
Figure 4. Application circuit for fixed output
LM2931
Application circuits
Figure 5. Application circuit for adjustable output
AMG110720161102MT
Note: R
1
suggested value = 27 kΩ
V
O
= V
REF
(R
1
+ R
2
)/R
1
Inhibit pin: regulator is enabled when V
INH
< 1.2 V , disabled when V
INH
> 3.25 V
DS1760 - Rev 23 page 5/26
LM2931
Electrical characteristics
5
Electrical characteristics
Refer to the application circuit Figure 4. Application circuit for fixed output , T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 100 µF,
V
I
= 14 V, I
O
= 10 mA, V
INH
= 0 V, unless otherwise specified.
Table 3. Electrical characteristics of LM2931A33/LM2931A33Y
Symbol
V
I
V
O
V
O
DV
O
Maximum operating input voltage
Output voltage
Output voltage
Line regulation
Parameter
I
O
= 10 mA, T
J
Test conditions
= -40 to 125 °C
DV
V d
O
Load regulation
Dropout voltage
I
O
= 100 mA, V
I
= 6 to 26 V T
J
= -40 to 125°C
V
I
= 9 to 16 V
V
I
= 6 to 26 V
I
O
= 5 to 100 mA
I
O
= 10 mA
I
O
= 100 mA
I
O
= 100 mA I d
I
SC
Quiescent current
ON MODE
OFF MODE
Short circuit current
SVR Supply voltage rejection
V
IL
V
IH
I
INH
V
I
V
I
V
I eN
Control input voltage low
Control input voltage high
Inhibit input current
Transient input voltage
Reverse polarity input voltage
Reverse polarity input voltage transient
Output noise voltage
V
INH
= 2.5 V, R
LOAD
= 330 Ω
I
O
= 100 mA, V
I
= 14 ± 2 V f = 120 Hz
T
J
= -40 to 125 °C
T
J
= -40 to 125 °C
V
INH
= 2.5 V
R
LOAD
= 330 Ω, Ƭ < 100 ms
V
O
= ± 0.3 V, R
LOAD
= 330 Ω
R
LOAD
= 330 Ω, Ƭ < 100 ms
B = 10 Hz to 100 kHz
1. V d
measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V.
0.3
100 300
55 78
3.25
60
-15
-50
2
2
22
70
-50
330
Min.
Typ.
Max.
26
3.175
3.3
3.425
3.135
3.3
3.465
2 10
4
10
33
33
90 250
250 600
2.5
30
1
1.2
50
Unit
V
V
V mV mV mV mA mA mA dB
V
V
µA
V
V
V
µV
RMS
DV
O
V d
Refer to the application circuit Figure 4. Application circuit for fixed output , T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 100 µF,
V
I
= 14 V, I
O
= 10 mA, V
INH
= 0 V, unless otherwise specified.
Table 4. Electrical characteristics of LM2931A50/ LM2931A50Y
Symbol
V
I
V
O
V
O
DV
O
Parameter
Maximum operating input voltage
Output voltage
Output voltage
Line regulation
Load regulation
Test conditions
I
O
= 10 mA, T
J
= -40 to 125 °C
I
O
= 100 mA, V
I
= 6 to 26 V T
J
= -40 to 125 °C
V
I
= 9 to 16 V
V
I
= 6 to 26 V
I
O
= 5 to 100 mA
I
O
= 10 mA
I
O
= 100 mA
Min.
Typ.
Max.
Unit
26 V
4.81
4.75
5
5
2
5.19
5.25
10
V
V mV
4
15
30
50
90 200
250 600 mV mV
DS1760 - Rev 23 page 6/26
LM2931
Electrical characteristics
Symbol
I d
Quiescent current ON MODE
OFF MODE
Parameter
I
SC
Short circuit current
SVR Supply voltage rejection
V
IL
V
IH
I
INH
V
I
V
I
V
I eN
Control input voltage low
Control input voltage high
Inhibit input current
Transient input voltage
Reverse polarity input voltage
Reverse polarity input voltage transient
Output noise voltage
I
O
= 100 mA
Test conditions
V
INH
= 2.5 V, R
LOAD
= 500 Ω
I
O
= 100 mA, V
I
= 14 ± 2 V f = 120 Hz
T
J
= -40 to 125 °C
T
J
= -40 to 125 °C
V
INH
= 2.5 V
R
LOAD
= 500 Ω, Ƭ < 100 ms
V
O
= ± 0.3 V, R
LOAD
= 500 Ω
R
LOAD
= 500 Ω, Ƭ < 100 ms
B = 10 Hz to 100 kHz
1. V d
measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V.
Min.
Typ.
Max.
Unit
2.5
30 mA
0.3
100 300
1 mA mA
55 75
2 1.2
3.25
60
-15 -50
-50
500
2
22
70
50
µV dB
V
V
µA
V
V
V
RMS
I
SC
SVR
V
IL
V
IH
I
INH
V
I
V
I
V
I eN
Symbol
V
I
V
REF
V
REF
DV
O
DV
O
V d
I d
Refer to the application circuit Figure 5. Application circuit for adjustable output with R
1
= 27 KΩand R
2
= 40.5 kΩ,
T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 100 µF, V
I
= 14 V, I
O
= 10 mA, V
INH
= 0 V, unless otherwise specified.
Table 5. Electrical characteristics of LM2931 (adjustable version)
Parameter
Maximum operating input voltage
Reference voltage
Reference voltage
Line regulation
Load regulation
Dropout voltage
Test conditions
I
O
= 10 mA, T
J
= -40 to 125 °C
I
O
= 100 mA, T
J
= -40 to 125 °C
V
I
= 3.6 to 26 V
I
O
= 5 to 100 mA
I
O
= 10 mA
I
O
= 100 mA
I
O
= 100 mA
Min.
Typ.
Max.
26
1.14
1.2
1.26
1.08
1.2
1.32
0.6
9
4.5
30
90 200
250 600
2.5
30
Unit
V
V
V mV mV mV mA Quiescent current
ON MODE
OFF MODE
Short circuit current
Supply voltage rejection
Control input voltage low
Control input voltage high
Inhibit input current
Transient input voltage
Reverse polarity input voltage
Reverse polarity input voltage transient
Output noise voltage
V
INH
= 2.5 V, R
LOAD
= 300 Ω
I
O
= 100 mA, V
I
= 14 ± 2 V f = 120 Hz
T
J
= -40 to 125 °C
T
J
= -40 to 125 °C
V
INH
= 2.5 V
R
LOAD
= 300 Ω, Ƭ < 100 ms
V
O
= ± 0.3 V, R
LOAD
= 300 Ω
R
LOAD
= 300 Ω, Ƭ < 100 ms
B = 10 Hz to 100 kHz
0.3
100 300
55 80
3.25
60
-15
-50
22
70
2
2
-50
330
1
1.2
50
V
V
µA
V mA mA dB
V
V
µV
RMS
1. Reference voltage is measured from V
OUT
to ADJ pin.
2. V d
measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V.
DS1760 - Rev 23 page 7/26
LM2931
Typical characteristics
6
Typical characteristics
Unless otherwise specified C
I
= 0.1 µF, C
O
= 100 µF.
Figure 6. Output voltage vs temperature Figure 7. Output voltage vs temperature
AMG110720161200MT
Figure 8. Reference voltage vs temperature
AMG110720161201MT
Figure 9. Line regulation vs temperature
AMG110720161202MT AMG110720161203MT
DS1760 - Rev 23 page 8/26
Figure 10. Load regulation vs temperature
LM2931
Typical characteristics
Figure 11. Dropout voltage vs temperature
AMG110720161204MT
Figure 12. Dropout voltage vs temperature
AMG110720161205MT
Figure 13. Dropout voltage vs output current
AMG110720161206MT AMG110720161207MT
DS1760 - Rev 23 page 9/26
Figure 14. Output voltage vs input voltage
LM2931
Typical characteristics
Figure 15. Short circuit current vs drop voltage
AMG110720161208MT
Figure 16. Quiescent current vs temperature
AMG110720161209MT
Figure 17. Quiescent current vs input voltage
AMG110720161210MT AMG110720161211MT
DS1760 - Rev 23 page 10/26
Figure 18. Quiescent current vs output current
LM2931
Typical characteristics
Figure 19. Supply voltage rejection vs temperature
AMG110720161212MT
Figure 20. Supply voltage rejection vs frequency
AMG110720161213MT
Figure 21. Supply voltage rejection vs output current
AMG110720161214MT
Figure 22. Stability vs C
O
S tability zo ne
10000
V
IN
I
O
C
= 7 to 16V
= 0 to 100mA
IN
= 0.1µF
1000 s table
100 not s table
10
0 5 10 15 20 25 30 35 40 45 50 55
Co ut [µF]
60 65 70 75 80 85 90 95 100 105
AMG150320171500MT
DS1760 - Rev 23
Figure 23. Line transient
AMG110720161215MT page 11/26
Figure 24. Load transient
LM2931
Typical characteristics
DS1760 - Rev 23 page 12/26
7
LM2931
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK ® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com
. ECOPACK ® is an ST trademark.
DS1760 - Rev 23 page 13/26
7.1
DPAK package information
Figure 25. DPAK package outline
LM2931
DPAK package information
DS1760 - Rev 23
Dim.
A
A1
A2 b b4 c c2
D
Table 6. DPAK mechanical data mm
Typ.
Min.
2.20
0.90
0.03
0.64
5.20
0.45
0.48
6.00
0068772_A_21
Max.
2.40
1.10
0.23
0.90
5.40
0.60
0.60
6.20
page 14/26
DS1760 - Rev 23
LM2931
DPAK package information
Dim.
e1
H
L
(L1)
L2
L4
R
V2
D1
E
E1 e
Min.
6.40
mm
Typ.
5.10
4.70
2.28
4.40
9.35
1.00
0.60
0°
2.80
0.80
0.20
Figure 26. DPAK recommended footprint (dimensions are in mm)
Max.
6.60
4.60
10.10
1.50
1.00
8°
FP_0068772_24 page 15/26
7.2
DPAK packing information
Figure 27. DPAK tape outline
LM2931
DPAK packing information
DS1760 - Rev 23 page 16/26
LM2931
SO8 package information
A
REEL DIMENSIONS
Figure 28. DPAK reel outline
40 mm min.
Access hole
At slot location
B
D
C
T
N
Full radius Tape slot in core for tape start 25 mm min.
width
7.3
SO8 package information
Figure 29. SO-8 package outline
G measured at hub
DS1760 - Rev 23
0016023_I page 17/26
DS1760 - Rev 23
Dim.
e h
L
E
E1
A
A1
A2 b c
D
L1 k ccc
Table 7. SO-8 mechanical data
Min.
mm
Typ.
0.25
0.40
0°
0.10
1.25
0.28
0.17
4.80
5.80
3.80
1.04
4.90
6.00
3.90
1.27
Figure 30. SO-8 recommended footprint
LM2931
SO8 package information
Max.
1.75
0.25
0.48
0.23
5.00
6.20
4.00
0.50
1.27
8°
0.10
0016023_I page 18/26
7.4
SO-8 packing information
Figure 31. SO-8 tape and reel outline
LM2931
SO-8 packing information
DS1760 - Rev 23
Dim.
Bo
Ko
Po
P
W
D
N
A
C
T
Ao
Table 8. SO-8 mechanical data
Min.
mm
Typ.
12.8
20.2
50
6.4
5.2
2.1
3.9
7.9
11.7
6.5
12.0
Max.
330
13.2
22.4
6.6
5.4
2.3
4.1
8.1
12.3
page 19/26
7.5
TO-92 package information
Figure 32. TO-92 package outline
LM2931
TO-92 package information
DS1760 - Rev 23
Dim.
S1
W
V e1
L
R
A b
D
E e
Table 9. TO-92 mechanical data mm
Typ.
Min.
1.14
12.70
2.16
0.92
0.41
4.32
0.36
4.45
3.30
2.41
5°
0102782_E
Max.
1.40
15.49
2.41
1.52
0.56
4.95
0.51
4.95
3.94
2.67
page 20/26
LM2931
Ordering informations
8
Ordering informations
Table 10. Order code
DPAK TO-92 (bag) SO-8
AG
LM2931ADT33RY
LM2931ADT50RY
Standard
LM2931ADT50R LM2931AZ50R
LM2931AD33R
LM2931AD50R
LM2931D-R
1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 and Q002 or equivalent .
Output voltages
3.3 V
5.0 V
2.5 to 26 V
DS1760 - Rev 23 page 21/26
LM2931
Revision history
Date
21-Jun-2004
16-Jun-2006
27-Jul-2007
21-Aug-2007
22-Nov-2007
11-Feb-2008
10-Jul-2008
26-May-2010
02-Nov-2011
09-Apr-2014
16-Mar-2017
23-Feb-2018
Table 11. Document revision history
Revision
12
13
14
15
16
17
18
19
20
21
22
23
Changes
Document updated.
Order codes updated.
Added Table 1 in cover page.
Added root part number - (see Table 1).
Modified: Table 1.
Modified: Table 1 on page 1.
Removed package TO-220, modified Table 1 on page 1.
Modified: V
I
values Table 4 on page 6, Table 5 on page 7 and
Table 6 on page 8.
Modified: Figure 4 on page 6. Added: (*) ADJ pin on the
Adjustable version, Not Connected in the fixed output version.
on page 4 and Inhibit pin: regulator is enabled when VINH < 1.2
V , disabled when VINH > 3.25 V on page 6.
Part numbers LM2931XX, LM2931AXX33 and LM2931AXX50 changed to LM2931. Updated the description in cover page
Section 2: Pin configuration and Section 7: Package information. Added Section 8: Revision history. Minor text changes.
Updated features in cover page, removed Table 1. Device summary from cover page, Table 3: "Electrical characteristics of
LM2931A33/LM2931A33Y" , Table 4: "Electrical characteristics of LM2931A50/ LM2931A50Y" and Table 5: "Electrical characteristics of LM2931 (adjustable version)".
Updated Section 7: "Package information".
Added Section 8: "Ordering information".
Minor text changes.
Updated Figure 5. Application circuit for adjustable output
.
DS1760 - Rev 23 page 22/26
LM2931
Contents
Contents
DS1760 - Rev 23 page 23/26
LM2931
List of tables
List of tables
DS1760 - Rev 23 page 24/26
LM2931
List of figures
List of figures
DS1760 - Rev 23 page 25/26
LM2931
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2018 STMicroelectronics – All rights reserved
DS1760 - Rev 23 page 26/26
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