December 2017
DocID2511 Rev 19
1/23
This is information on a product in full production.
www.st.com
L79L
Negative voltage regulators
Datasheet - production data
Features
Output current up to 100 mA
Output voltages of -5; -8;-12; -15 V
Thermal overload protection
Short-circuit protection
No external components are required
Output tolerance + 4%
Description
The L79L series of three-terminal negative
regulators employ internal current limiting and
thermal shutdown, making them essentially
indestructible. If adequate heat-sink is provided,
they can deliver up to 100 mA output current.
They are intended as fixed voltage regulators in a
wide range of applications including local or on-
card regulation for elimination of noise and
distribution problems associated with single-point
regulation. In addition, they can be used with
power pass elements to make high-current
voltage regulators. The L79L series used as
Zener diode/resistor combination replacement,
offers an effective output impedance
improvement of typically two orders of magnitude,
along with lower quiescent current and lower
noise.
Contents
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Contents
1 Diagram ............................................................................................ 3
2 Pin configuration ............................................................................. 4
3 Maximum ratings ............................................................................. 5
4 Electrical characteristics ................................................................ 6
5 Package information ....................................................................... 9
5.1 TO-92 package information ............................................................... 9
5.2 TO-92 packing information .............................................................. 10
5.3 TO-92 Ammopak packing information ............................................. 12
5.4 SO-8 package information .............................................................. 14
5.5 SO-8 packing information ................................................................ 16
5.6 SOT-89 package information .......................................................... 17
5.7 SOT-89 packing information............................................................ 20
6 Ordering information ..................................................................... 21
7 Revision history ............................................................................ 22
L79L
Diagram
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1 Diagram
Figure 1: Schematic diagram
Pin configuration
L79L
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2 Pin configuration
Figure 2: Pin connection (top view, bottom view for TO-92)
Figure 3: Test circuit
L79L
Maximum ratings
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3 Maximum ratings
Table 1: Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
DC input voltage
VO = -5 to -9 V
-30
V
VO = -12 to -15 V
-35
IO
Output current
100
mA
PD
Power dissipation
Internally limited (1)
mW
TSTG
Storage temperature range
-40 to 150
°C
TOP
Operating junction temperature range
For L79LXXAC
0 to 125
°C
For L79LXXAB
-40 to 125
Notes:
(1) Our SO-8 package used for Voltage Regulators is modified internally to have pins 2, 3, 6 and 7 electrically
communed to the die attach flag. This particular frame decreases the total thermal resistance of the package and
increases its ability to dissipate power when an appropriate area of copper on the printed circuit board is available
for heat-sinking. The external dimensions are the same as for the standard SO-8.
Table 2: Thermal data
Symbol
Parameter
SO-8
TO-92
SOT-89
Unit
RthJC
Thermal resistance junction-case (max.)
20
15
°C/W
RthJA
Thermal resistance junction-ambient (max.)
55 (1)
200
115
°C/W
Notes:
(1) Considering 6 cm2 of copper Board heat-sink.
Electrical characteristics
L79L
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4 Electrical characteristics
Refer to the test circuits, VI = - 10 V, IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF, TJ = 0
to 125 °C for L79L05AC, TJ = -40 to 125 °C for L79L05AB, unless otherwise specified.
Table 3: Electrical characteristics of L79L05AC and L79L05AB
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25 °C
-4.8
-5
-5.2
V
VO
Output voltage
IO = 1 to 40 mA, VI = -7 to -20 V
-
4.75
-
5.25
V
IO = 1 to 70 mA, VI = -10 V
-
4.75
-
5.25
ΔVO
Line regulation
VI = -7 to -20 V, TJ = 25 °C
150
mV
VI = -8 to -20 V, TJ = 25 °C
100
ΔVO
Load regulation
IO = 1 to 100 mA, TJ = 25 °C
60
mV
IO = 1 to 40 mA, TJ = 25 °C
30
Id
Quiescent current
TJ = 25 °C
6
mA
TJ = 125 °C
5.5
mA
ΔId
Quiescent current
change
IO = 1 to 40 mA
0.1
mA
VI = -8 to -20 V
1.5
eN
Output noise voltage
B = 10 Hz to 100 kHz, TJ = 25 °C
40
µV
SVR
Supply voltage
rejection
VI = -8 to -18 V, f = 120 Hz IO = 40
mA, TJ = 25 °C
41
49
dB
Vd
Dropout voltage
1.7
V
Refer to the test circuits, VI = - 14 V, IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF, TJ = 0
to 125 °C for L79L08AC TJ = -40 to 125 °C for L79L08AB, unless otherwise specified.
Table 4: Electrical characteristics of L79L08AC and L79L08AB
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25 °C
-
7.68
-8
-
8.32
V
VO
Output voltage
IO = 1 to 40 mA, VI = -10.5 to -23 V
-7.6
-8.4
V
IO = 1 to 70 mA, VI = -14 V
-7.6
-8.4
ΔVO
Line regulation
VI = -10.5 to -23 V, TJ = 25 °C
175
mV
VI = -11 to -23 V, TJ = 25 °C
125
ΔVO
Load regulation
IO = 1 to 100 mA, TJ = 25 °C
80
mV
IO = 1 to 40 mA, TJ = 25 °C
40
Id
Quiescent current
TJ = 25 °C
6
mA
TJ = 125 °C
5.5
mA
ΔId
Quiescent current
change
IO = 1 to 40 mA
0.1
mA
VI = -11 to -23 V
1.5
eN
Output noise
voltage
B = 10 Hz to 100 kHz, TJ = 25 °C
60
µV
L79L
Electrical characteristics
DocID2511 Rev 19
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Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
SVR
Supply voltage
rejection
VI = -12 to -23 V, f = 120 Hz, IO = 40
mA, TJ = 25 °C
37
45
dB
Vd
Dropout voltage
1.7
V
Refer to the test circuits, VI = - 19 V, IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF, TJ = 0 to 125
°C for L79L12AC, TJ = -40 to 125 °C for L79L12AB, unless otherwise specified.
Table 5: Electrical characteristics of L79L12AC and L79L12AB
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25°C
-11.5
-12
-12.5
V
VO
Output voltage
IO = 1 to 40 mA, VI = -14.5
to -27 V
-11.4
-12.6
V
IO = 1 to 70 mA, VI = -19 V
-11.4
-12.6
ΔVO
Line regulation
VI = -14.5 to -27 V, TJ = 25 °C
250
mV
VI = -16 to -27 V, TJ = 25 °C
200
ΔVO
Load regulation
IO = 1 to 100 mA, TJ = 25 °C
100
mV
IO = 1 to 40 mA, TJ = 25 °C
50
Id
Quiescent current
TJ = 25 °C
6.5
mA
TJ = 125 °C
6
mA
ΔId
Quiescent current
change
IO = 1 to 40 mA
0.1
mA
VI = -16 to -27 V
1.5
eN
Output noise
voltage
B = 10 Hz to 100 kHz,
TJ = 25 °C
80
µV
SVR
Supply voltage
rejection
VI = -15 to -25 V, f = 120 Hz
IO = 40 mA, TJ = 25 °C
37
42
dB
Vd
Dropout voltage
1.7
V
Refer to the test circuits, VI = - 23 V, IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF, TJ = 0
to 125 °C for L79L15AC, TJ = -40 to 125 °C for L79L15AB, unless otherwise specified.
Table 6: Electrical characteristics of L79L15AC and L79L15AB
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25°C
-14.4
-15
-15.6
V
VO
Output voltage
IO = 1 to 40 mA, VI = -17.5
to -30 V
-14.25
-15.75
V
IO = 1 to 70 mA, VI = -23 V
-14.25
-15.75
ΔVO
Line regulation
VI = -17.5 to -30 V, TJ = 25 °C
300
mV
VI = -20 to -30 V, TJ = 25 °C
250
ΔVO
Load regulation
IO = 1 to 100 mA, TJ = 25 °C
150
mV
IO = 1 to 40 mA, TJ = 25 °C
75
Id
Quiescent current
TJ = 25 °C
6.5
mA
TJ = 125 °C
6
mA
ΔId
Quiescent current
change
IO = 1 to 40 mA
0.1
mA
VI = -20 to -30 V
1.5
Electrical characteristics
L79L
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Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
eN
Output noise
voltage
B = 10 Hz to 100 kHz,
TJ = 25 °C
90
µV
SVR
Supply voltage
rejection
VI = -18.5 to -28.5.V,
f = 120 Hz IO = 40 mA,
TJ = 25 °C
34
39
dB
Vd
Dropout voltage
1.7
V
L79L
Package information
DocID2511 Rev 19
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5 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.
5.1 TO-92 package information
Figure 4: TO-92 package outline
Table 7: TO-92 mechanical data
Dim.
mm
Min.
Typ.
Max.
A
4.32
4.95
b
0.36
0.51
D
4.45
4.95
E
3.30
3.94
e
2.41
2.67
e1
1.14
1.40
L
12.70
15.49
R
2.16
2.41
S1
0.92
1.52
W
0.41
0.56
V
5°
Package information
L79L
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5.2 TO-92 packing information
Figure 5: TO-92 tape and reel outline
L79L
Package information
DocID2511 Rev 19
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Table 8: TO-92 tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A1
4.80
T
3.80
T1
1.60
T2
2.30
d
0.45
0.47
0.48
P0
12.50
12.70
12.90
P2
5.65
6.35
7.05
F1, F2
2.40
2.50
2.94
F3
4.98
5.08
5.48
delta H
-2.00
2.00
W
17.50
18.00
19.00
W0
5.5
6.00
6.5
W1
8.50
9.00
9.25
W2
0.50
H
18.50
21
H3
0.5
1
2
H0
15.50
16.00
18.8
H1
25.0
27.0
D0
3.80
4.00
4.20
t
0.90
L
11.00
I1
3.00
delta P
-1.00
1.00
Ø1
352
355
358
Ø2
28
30
32
u
44
47
50
Package information
L79L
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5.3 TO-92 Ammopak packing information
Figure 6: TO-92 Ammopak tape and reel outline
L79L
Package information
DocID2511 Rev 19
13/23
Table 9: TO-92 Ammopak tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A1
4.80
T
3.80
T1
1.60
T2
2.30
d
0.45
0.47
0.48
P0
12.50
12.70
12.90
P2
5.65
6.35
7.05
F1, F2
2.40
2.50
2.94
F3
4.98
5.08
5.48
delta H
-2.00
2.00
W
17.50
18.00
19.00
W0
5.5
6.00
6.5
W1
8.50
9.00
9.25
W2
0.50
H
18.50
21
H3
0.5
1
2
H0
15.50
16.00
18.8
H1
25.0
27.0
D0
3.80
4.00
4.20
t
0.90
L
11.00
I1
3.00
delta P
-1.00
1.00
Package information
L79L
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5.4 SO-8 package information
Figure 7: SO-8 package outline
L79L
Package information
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Table 10: SO-8 mechanical data
Dim.
mm
Min.
Typ.
Max.
A
1.75
A1
0.10
0.25
A2
1.25
b
0.31
0.51
b1
0.28
0.48
c
0.10
0.25
c1
0.10
0.23
D
4.80
4.90
5.00
E
5.80
6.00
6.20
E1
3.80
3.90
4.00
e
1.27
h
0.25
0.50
L
0.40
1.27
L1
1.04
L2
0.25
k
0°
8°
ccc
0.10
Figure 8: SO-8 recommended footprint (dimensions are in mm)
Package information
L79L
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5.5 SO-8 packing information
Figure 9: SO-8 tape and reel dimensions
Table 11: SO-8 tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A
-
330
C
12.8
13.2
D
20.2
N
60
T
22.4
Ao
8.1
8.5
Bo
5.5
5.9
Ko
2.1
2.3
Po
3.9
4.1
P
7.9
8.1
L79L
Package information
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5.6 SOT-89 package information
Figure 10: SOT-89 package outline
Package information
L79L
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Table 12: SOT-89 mechanical data
Dim.
mm
Min.
Typ.
Max.
A
1.40
1.60
B
0.44
0.56
B1
0.36
0.48
C
0.35
0.44
C1
0.35
0.44
D
4.40
4.60
D1
1.62
1.83
D3
0.90
E
2.29
2.60
e
1.42
1.57
e1
2.92
3.07
H
3.94
4.25
H1
2.70
3.10
K
1°
8°
L
0.89
120
R
0.25
β
90°
L79L
Package information
DocID2511 Rev 19
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Figure 11: SOT-89 recommended footprint
Package information
L79L
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5.7 SOT-89 packing information
Figure 12: SOT-89 carrier tape outline
Table 13: SOT-89 carrier tape mechanical data
Dim.
mm
Value
Tolerance
Ao
4.91
± 0.10
Bo
4.52
± 0.10
Ko
1.90
± 0.10
F
5.50
± 0.10
E
1.75
± 0.10
W
12
± 0.30
P2
2
± 0.10
Po
4
± 0.10
P1
8
± 0.10
T
0.30
± 0.10
D
Ø 1.55
± 0.05
D1
Ø 1.60
± 0.10
L79L
Ordering information
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6 Ordering information
Table 14: Ordering information
SO-8
TO-92
(bag)
TO-92
(Ammopak)
TO-92 (tape
and reel)
SOT-89
Output
voltage (V)
L79L05ABD13TR
L79L05ACZ
L79L05ABZ-
AP
L79L05ABUTR
-5
L79L05ACD13TR
L79L08ACZ-
AP
L79L05ACZ-TR
L79L05ACUTR
-5
L79L08ACD13TR
-8
L79L12ACD13TR
L79L12ACZ-TR
L79L12ACUTR
-12
L79L15ABD13TR
-15
L79L15ACD13TR
L79L15ACUTR
-15
Revision history
L79L
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7 Revision history
Table 15: Document revision history
Date
Revision
Changes
14-Mar-2005
9
Add Tape and Reel for TO-92.
15-Mar-2005
10
Add note on Table 3.
23-Dec-2005
11
Mistake on ordering Table in Header.
12-Sep-2006
12
Order codes updated.
25-Jul-2007
13
Pin connection for SOT-89 updated on Figure 2.
04-Dec-2007
14
Modified: Table 14.
14-Jul-2008
15
Modified: Table 14 on page 24.
29-Jul-2009
16
Modified: Table 14 on page 24.
17-Apr-2014
17
Part numbers L79LxxAB, L78LxxAC, L78LxxC
changed to L79L. Removed Table 1: Device summary.
Updated the features and description in cover page.
Updated Figure 1: Schematic diagram, Table 1:
Absolute maximum ratings and Table 14: Order codes.
Added Section 5: Packaging mechanical data. Minor
text changes.
12-Feb-2016
18
Updated Section 5: Package information.
Minor text changes.
06-Dec-2017
19
Updated features in cover page.
L79L
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