LM2931
SERIES
VERY LOW DROP
VOLTAGE REGULATORS WITH INHIBIT FUNCTION
■ VERY LOW DROPOUT VOLTAGE (0.15V
TYP. AT 10mA LOAD)
■ LOW QUIESCENT CURRENT (TYP. 2.5mA,
AT 100mA LOAD)
■ OUTPUT CURRENT UP TO 100mA
■ ADJUSTABLE (FROM V
= 2.5V ONLY
OUT
SO-8) AND FIXED (3.3V & 5V) OUTPUT
VOLTAGE VERSION
■ INTERNAL CURRENT AND THERMAL LIMIT
■ LOAD DUMP PROTECTION UP TO 60V
■ REVERSE TRANSIENT PROTECTIO N UP
TO -50V
■ TEMPERATURE RANGE: -40 TO 125°C
■ P AC KAG E AVAILABLE: TO-92, DPAK,
TO-220, SO-8 (WITH INHIBIT CONTROL)
DESCRIPTION
The LM2931 serie s are very low drop regul ators.
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 to the older L78L00
family, a shut down Logic Control function is
available.
This means that when the device is used as a
local regulator is possible to put a part of the board
TO-220
DPAK
TO-92
SO-8
in stand-by decreasing the total power
consumption. Ideal for automotive application the
LM2931 is protected from reverse battery
installations or 2 battery jumps. During the
transient, such as a a load dump (60V) when the
input voltage can e xceed the specified maximum
operating input voltage (26V), the regulator will
automatically shut down to protect both internal
circuit and the load.
Figure 1: Schematic Diagram
Rev. 12
1/21December 2005
LM2931 SERIES
Table 1: Absolute Maximum Ratings
Symbol Parameter Value Unit
V
V
V
V
V
INH
I
T
T
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 Parameter TO-220 SO-8 DPAK TO-92 Unit
R
thj-case
R
thj-amb
DC Positive Input Voltage
I
DC Reverse Input Voltage
I
Transient Input Voltage (τ < 100ms)
I
Transient Reverse Input Voltage (τ < 100ms)
I
Inhibit Input Voltage
Output Current
O
Storage Temperature Range
stg
Operating Junction Temperature Range
op
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
40 V
-15 V
60 V
-50 V
40 V
Internally Limited
-65 to 150 °C
-40 to 125 °C
3208 °C/W
50 55(*) 100 200 °C/W
(*) Cons i d ering 6 cm2 of copper board heat-si nk
Figure 2: Pin Connec tion (top view)
TO-220
PIN 2 = GND
PIN 3 = V
OUT
IN
TO-92
(*) = N.C. for FIXED and ADJ for ADJUSTABLE
SO-8
BOTTOM VIEWPIN 1 = V
DPAK
2/21
Table 3: Ordering Codes
LM2931 SERIES
TO-220 DPAK (*) TO-92 (BAG) (#) SO-8 (*)
OUTPUT
VOLTAGE
LM2931AV33 LM2931ADT33 LM2931AZ33 LM2931AD33 3.3 V
LM2931BV33 LM2931BDT33 LM2931BZ33 LM2931BD33 3.3 V
LM2931AV50 LM2931ADT50 LM2931AZ50 LM2931AD50 5.0 V
LM2931BV50 LM2931BDT50 LM2931BZ50 LM2931BD50 5.0 V
LM2931D 2.5 to 26 V
(*) Avai l abl e in Tape & Re el wi th the suffix "R" for fixed version and "-R" for adjustable version.
(#) Available in Ammopak with the suffix "AP" or in Tape & Reel with the suffix "R". Please n ote that in these ca ses pins are shaped
accordi ng to Tape & Reel specifications.
Figure 3: Applica tion Circuit For Fixe d Output
Figure 4: Application Circuit For Adjustable Output
R1 suggested Value = 27KΩ
= V
O
(R1 + R2)/R1.
REF
V
3/21
LM2931 SERIES
Table 4: Electrical Characteristics Of LM2931A 3.3V (refer to the test circuits, TJ = 25°C,
= 0.1 µF, CO = 100 µF, VI = 14V, IO = 10mA, V
C
I
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Maximum Operating Input
I
Voltage
V
Output Voltage 3.135 3.3 3.425 V
O
Output Voltage IO = 100 mAVI = 6 to 26 V
V
O
∆V
∆V
Line Regulation VI = 9 to 16 V 2 10 mV
O
Load Regulation IO = 5 to 100 mA 10 33 mV
O
Dropout Voltage (Note 1, 2) IO = 10 mA 90 250 mV
V
d
Quiescent Current
I
d
ON MODE
OFF MODE V
Short Circuit Current 100 300 mA
I
SC
SVR Supply Voltage Rejection I
IO = 10 mA TJ = -40 to 125°C 26 37 V
T
= -40 to 125°C
J
= 6 to 26 V 4 33
V
I
= 100 mA 250 600
I
O
IO = 100 mA 2.5 30 mA
= 2.5 V R
INH
= 100 mA, VI = 14 ± 2 V
O
f = 120 Hz, T
Control Input Voltage Low TJ = -40 to 125°C 2 1.2 V
V
IL
Control Input Voltage High TJ = -40 to 125°C 3.25 2 V
V
IH
Inhibit Input Current V
I
INH
V
Transient Input Voltage R
I
Reverse Polarity Input
V
I
Voltage
V
Reverse Polarity Input
I
Voltage Transient
= 2.5 V 22 50 µA
INH
= 330 Ωτ < 100ms 60 70 V
LOAD
VO = ± 0.3 V R
R
= 330 Ωτ < 100ms -50 V
LOAD
eN Output Noise Voltage B =10 Hz to 100 KHz 330 µV
= 0V, unless otherwise specified).
INH
3.135 3.3 3.465 V
= 330 Ω 0.31mA
LOAD
55 78 dB
= -40 to 125°C
J
= 330 Ω -15 -50 V
LOAD
RMS
Note 1: Reference Voltage is me asured from V
Note 2: V
measured when the o ut put voltage ha s dropped 100mV from the nom i nal value obtai ned at 14V.
d
4/21
to ADJ pin.
OUT
LM2931 SERIES
Table 5: Electrical Characteristics Of LM2931B 3.3V (refer to the test circuits, TJ = 25°C,
= 0.1 µF, CO = 100 µF, VI = 14V, IO = 10mA, V
C
I
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Maximum Operating Input
I
Voltage
V
Output Voltage 3.135 3.3 3.465 V
O
Output Voltage IO = 100 mAVI = 6 to 26 V
V
O
∆V
∆V
Line Regulation VI = 9 to 16 V 2 10 mV
O
Load Regulation IO = 5 to 100 mA 10 33 mV
O
Dropout Voltage (Note 1, 2) IO = 10 mA 90 200 mV
V
d
Quiescent Current
I
d
ON MODE
OFF MODE V
Short Circuit Current 100 300 mA
I
SC
SVR Supply Voltage Rejection I
IO = 10 mA TJ = -40 to 125°C 26 37 V
T
= -40 to 125°C
J
= 6 to 26 V 4 33
V
I
= 100 mA 250 600
I
O
IO = 100 mA 2.5 30 mA
= 2.5 V R
INH
= 100 mA, VI = 14 ± 2 V
O
f = 120 Hz, T
Control Input Voltage Low TJ = -40 to 125°C 2 1.2 V
V
IL
Control Input Voltage High TJ = -40 to 125°C 3.25 2 V
V
IH
Inhibit Input Current V
I
INH
V
Transient Input Voltage R
I
Reverse Polarity Input
V
I
Voltage
V
Reverse Polarity Input
I
Voltage Transient
= 2.5 V 22 50 µA
INH
= 330 Ωτ < 100ms 60 70 V
LOAD
VO = ± 0.3 V R
R
= 330 Ωτ < 100ms -50 V
LOAD
eN Output Noise Voltage B =10 Hz to 100 KHz 330 µV
= 0V, unless otherwise specified).
INH
2.97 3.3 3.63 V
= 330 Ω 0.31mA
LOAD
55 78 dB
= -40 to 125°C
J
= 330 Ω -15 -50 V
LOAD
RMS
Note 1: Reference Voltage is me asured from V
Note 2: V
measured when the o ut put voltage ha s dropped 100mV from the nom i nal value obtai ned at 14V.
d
to ADJ pin.
OUT
5/21
LM2931 SERIES
Table 6: Electrical Characteristics Of LM2931A 5V (refer to the test circuits, TJ = 25°C ,
= 0.1 µF, CO = 100 µF, VI = 14V, IO = 10mA, V
C
I
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Maximum Operating Input
I
Voltage
V
Output Voltage 4.81 5 5.19 V
O
Output Voltage IO = 100 mAVI = 6 to 26 V
V
O
∆V
∆V
Line Regulation VI = 9 to 16 V 2 10 mV
O
Load Regulation IO = 5 to 100 mA 15 50 mV
O
Dropout Voltage (Note 1, 2) IO = 10 mA 90 200 mV
V
d
Quiescent Current
I
d
ON MODE
OFF MODE V
Short Circuit Current 100 300 mA
I
SC
SVR Supply Voltage Rejection I
IO = 10 mA TJ = -40 to 125°C 26 37 V
T
= -40 to 125°C
J
= 6 to 26 V 4 30
V
I
= 100 mA 250 600
I
O
IO = 100 mA 2.5 30 mA
= 2.5 V R
INH
= 100 mA, VI = 14 ± 2 V
O
f = 120 Hz, T
Control Input Voltage Low TJ = -40 to 125°C 2 1.2 V
V
IL
Control Input Voltage High TJ = -40 to 125°C 3.25 2 V
V
IH
Inhibit Input Current V
I
INH
V
Transient Input Voltage R
I
Reverse Polarity Input
V
I
Voltage
V
Reverse Polarity Input
I
Voltage Transient
= 2.5 V 22 50 µA
INH
= 500 Ωτ < 100ms 60 70 V
LOAD
VO = ± 0.3 V R
R
= 500 Ωτ < 100ms -50 V
LOAD
eN Output Noise Voltage B =10 Hz to 100 KHz 500 µV
= 0V, unless otherwise specified).
INH
4.75 5 5.25 V
= 500 Ω 0.31mA
LOAD
55 75 dB
= -40 to 125°C
J
= 500 Ω -15 -50 V
LOAD
RMS
Note 1: Reference Voltage is me asured from V
Note 2: V
measured when the o ut put voltage ha s dropped 100mV from the nom i nal value obtai ned at 14V.
d
6/21
to ADJ pin.
OUT
LM2931 SERIES
Table 7: Electrical Characteristics Of LM2931B 5V (refer to the test circuits, TJ = 25°C ,
= 0.1 µF, CO = 100 µF, VI = 14V, IO = 10mA, V
C
I
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Maximum Operating Input
I
Voltage
V
Output Voltage 4.75 5 5.25 V
O
Output Voltage IO = 100 mAVI = 6 to 26 V
V
O
∆V
∆V
Line Regulation VI = 9 to 16 V 2 10 mV
O
Load Regulation IO = 5 to 100 mA 15 50 mV
O
Dropout Voltage (Note 1, 2) IO = 10 mA 90 200 mV
V
d
Quiescent Current
I
d
ON MODE
OFF MODE V
Short Circuit Current 100 300 mA
I
SC
SVR Supply Voltage Rejection I
IO = 10 mA TJ = -40 to 125°C 26 37 V
T
= -40 to 125°C
J
= 6 to 26 V 4 30
V
I
= 100 mA 250 600
I
O
IO = 100 mA 2.5 30 mA
= 2.5 V R
INH
= 100 mA, VI = 14 ± 2 V
O
f = 120 Hz, T
Control Input Voltage Low TJ = -40 to 125°C 2 1.2 V
V
IL
Control Input Voltage High TJ = -40 to 125°C 3.25 2 V
V
IH
Inhibit Input Current V
I
INH
V
Transient Input Voltage R
I
Reverse Polarity Input
V
I
Voltage
V
Reverse Polarity Input
I
Voltage Transient
= 2.5 V 22 50 µA
INH
= 500 Ωτ < 100ms 60 70 V
LOAD
VO = ± 0.3 V R
R
= 500 Ωτ < 100ms -50 V
LOAD
eN Output Noise Voltage B =10 Hz to 100 KHz 500 µV
= 0V, unless otherwise specified).
INH
4.555.5V
= 500 Ω 0.31mA
LOAD
55 75 dB
= -40 to 125°C
J
= 500 Ω -15 -50 V
LOAD
RMS
Note 1: Reference Voltage is me asured from V
Note 2: V
measured when the o ut put voltage ha s dropped 100mV from the nom i nal value obtai ned at 14V.
d
to ADJ pin.
OUT
7/21
LM2931 SERIES
Table 8: Electrical Characteristics Of LM2931ADJ (refer to the test circuits figure 2 with R1 = 27KΩ
And R
= 40.5kΩ, TJ = 25°C, CI = 0.1 µF, CO = 100 µF, VI = 14V, IO = 10mA, V
2
wise specified).
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Maximum Operating Input
I
Voltage
V
V
∆V
∆V
Reference Voltage (Note 1) 1.14 1.2 1.26 V
REF
Reference Voltage (Note 1) IO = 100 mA TJ = -40 to 125°C 1.08 1.2 1.32 V
REF
Line Regulation VI = 3.6 to 26 V 0.6 4.5 mV
O
Load Regulation IO = 5 to 100 mA 9 30 mV
O
Dropout Voltage (Note 1, 2) IO = 10 mA 90 200 mV
V
d
I
Quiescent Current
d
ON MODE
OFF MODE V
Short Circuit Current 100 300 mA
I
SC
SVR Supply Voltage Rejection I
Control Input Voltage Low TJ = -40 to 125°C 2 1.2 V
V
IL
Control Input Voltage High TJ = -40 to 125°C 3.25 2 V
V
IH
I
Inhibit Input Current V
INH
Transient Input Voltage R
V
I
Reverse Polarity Input
V
I
Voltage
V
Reverse Polarity Input
I
Voltage Transient
eN Output Noise Voltage B =10 Hz to 100 KHz 330 µV
IO = 10 mA TJ = -40 to 125°C 26 37 V
= 100 mA 250 600
I
O
IO = 100 mA 2.5 30 mA
= 2.5 V R
INH
= 100 mA VI = 14 ± 2 V
O
f = 120 Hz T
= 2.5 V 22 50 µA
INH
= 300 Ωτ < 100ms 60 70 V
LOAD
VO = ± 0.3 V R
R
= 300 Ωτ < 100ms -50 V
LOAD
= 300 Ω 0.31mA
LOAD
55 80 dB
= -40 to 125°C
J
= 300 Ω -15 -50 V
LOAD
= 0V, unless other-
INH
RMS
Note 1: Reference Voltage is me asured from V
Note 2: V
measured when the o ut put voltage ha s dropped 100mV from the nom i nal value obtai ned at 14V.
d
8/21
to ADJ pin.
OUT
LM2931 SERIES
TYPICAL CHARACTERISTICS (unless otherwise specified CI = 0.1 µF, CO = 100 µF).
Figure 5: Output Voltage vs Temperature
Figure 6: Output Voltage vs Temperature
Figure 8: Line Regulation vs Temperature
Figure 9: Load Regulation vs Tempe rature
Figure 7: Reference Voltage vs Temperature
Figure 10: Dropout Voltage vs Temperature
9/21
LM2931 SERIES
Figure 11: Dropout Voltage vs Temperature
Figure 12: Dropout Voltage vs Output Current
Figure 14: Short Circuit Current vs Drop
Voltage
Figure 15: Quiescent Current vs Temperature
Figure 13: Output Voltage vs Input Voltage
10/21
Figure 16: Quiescent Current vs Input Voltage
LM2931 SERIES
Figure 17: Quiescent Current vs Output Current
Figure 18: Supply Voltage Rejection vs
Temperature
Figure 20: Supply Voltage Rejection vs Output Current
Figure 21: Stability vs C
O
Figure 19: Supply Voltage Rejection vs Frequency
Figure 22: Line Transient
VI = 6 to 20 V, RL = 500Ω, TJ = 25°C, CI = 0, CO = 100µF,
Rise Fall-Time = 200 ns
11/21
LM2931 SERIES
Figure 23: Load Transient
VI = 14 V, IO = 100mA, TJ = 25°C, CI = 0.1µF, CO = 100µF,
Rise Time = 50 0ns, Fall-Time = 1µs
12/21
LM2931 SERIES
TO-220 MECHANICAL DAT
DIM.
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
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
A
P011C
13/21
LM2931 SERIES
TO-92 MECHANICAL DATA
mm. mils
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 4.32 4.95 170.1 194.9
b 0.36 0.51 14.2 20.1
D 4.45 4.95 175.2 194.9
E 3.30 3.94 129.9 155.1
e 2.41 2.67 94.9 105.1
e1 1.14 1.40 44.9 55.1
L 12.7 15.49 500.0 609.8
R 2.16 2.41 85.0 94.9
S1 0.92 1.52 36.2 59.8
W 0.41 0.56 16.1 22.0
α 5° 5°
14/21
0102782/D
SO-8 MECHANICAL DATA
LM2931 SERIES
DIM.
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H 5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k ˚ (max.)
ddd 0.1 0.04
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
8
0016023/C
15/21
LM2931 SERIES
DPAK MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 2.2 2.4 0.086 0.094
A1 0.9 1.1 0.035 0.043
A2 0.03 0.23 0.001 0.009
B 0.64 0.9 0.025 0.035
b4 5.2 5.4 0.204 0.212
C 0.45 0.6 0.017 0.023
C2 0.48 0.6 0.019 0.023
D 6 6.2 0.236 0.244
D1 5.1 0.200
E 6.4 6.6 0.252 0.260
E1 4.7 0.185
e 2.28 0.090
e1 4.4 4.6 0.173 0.181
H 9.35 10.1 0.368 0.397
L 1 0.039
(L1)
L2 0.8 0.031
L4 0.6 1 0.023 0.039
mm. inch
2.8 0.110
16/21
0068772-F
LM2931 SERIES
Tape & Reel DPAK-PPAK MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 6.80 6.90 7.00 0.268 0.272 0.2.76
Bo 10.40 10.50 10.60 0.409 0.413 0.417
Ko 2.55 2.65 2.75 0.100 0.104 0.105
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 7.9 8.0 8.1 0.311 0.315 0.319
mm. inch
17/21
LM2931 SERIES
Tape & Reel SO-8 MECHANICAL DATA
mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 8.1 8.5 0.319 0.335
Bo 5.5 5.9 0.216 0.232
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
18/21
Tape & Reel for TO-92 MECHANICAL DATA
LM2931 SERIES
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
A1 4.80 0.189
T 3.80 0.150
T1 1.60 0.063
T2 2.30 0.091
d 0.48 0.019
P0 12.5 12.9 0.492 0.508
P2 5.65 7.05 0.222 0.278
F1, F2 2.44 2.54 2.94 0.096 0.100 0.116
delta H ±2 0.079
W 17.5 18.00 19.0 0.689 0.709 0.748
W0 5.7 6.3 0.224 0.248
W1 8.5 9.25 0.335 0.364
W2 0.50 0.20
H 18.50 18.70 0.728 0.726
H0 15.50 16.50 0.610 0.650
H1 25.00 0.984
D0 3.8 4.2 0.150 0.165
t 0.90 0.035
L1 3 0.118
delta P ±1 0.039
u 50 1.968
Φ1 360 14.173
Φ2 30 1.181
H1
delta P
A1
delta H
H
H0
L
d
W2
T
T2
T1
Φ1
Φ2
Pull-out direction
l1
W
W0
W1
F1
F2
P2
P0
D0
t
u
DRAWING NOT IN SCALE
19/21
LM2931 SERIES
Table 9: Revision History
Date R evisio n Description of Change s
15-Mar-2005 11 Add Tape & Reel for TO-92.
23-Dec-2005 12 Mistake on Ordering Table in Header.
20/21
LM2931 SERIES
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