L79L
Negative voltage regulators
Datasheet - production data
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.
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%
December 2017
DocID2511 Rev 19
1/23
www.st.com
This is information on a product in full production.
Contents
L79L
Contents
1
2
3
4
5
Diagram ............................................................................................ 3
Pin configuration ............................................................................. 4
Maximum ratings ............................................................................. 5
Electrical characteristics ................................................................ 6
Package information ....................................................................... 9
5.1
5.2
5.3
5.4
5.5
5.6
5.7
TO-92 package information ............................................................... 9
TO-92 packing information .............................................................. 10
TO-92 Ammopak packing information ............................................. 12
SO-8 package information .............................................................. 14
SO-8 packing information ................................................................ 16
SOT-89 package information .......................................................... 17
SOT-89 packing information............................................................ 20
6
7
Ordering information..................................................................... 21
Revision history ............................................................................ 22
2/23
DocID2511 Rev 19
L79L
Diagram
1
Diagram
Figure 1: Schematic diagram
DocID2511 Rev 19
3/23
Pin
configuration
L79L
2
Pin configuration
Figure 2: Pin connection (top view, bottom view for TO-92)
Figure 3: Test circuit
4/23
DocID2511 Rev 19
L79L
Maximum
ratings
3
Maximum ratings
Table 1: Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
T
OP
Notes:
(1)
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
V
O
= -5 to -9 V
V
O
= -12 to -15 V
-30
-35
100
Internally limited
(1)
-40 to 150
For L79LXXAC
For L79LXXAB
0 to 125
-40 to 125
Unit
V
mA
mW
°C
°C
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
R
thJC
R
thJA
Notes:
(1)
Parameter
Thermal resistance junction-case (max.)
Thermal resistance junction-ambient (max.)
SO-8
20
55
(1)
TO-92
SOT-89
15
Unit
°C/W
°C/W
200
115
Considering 6 cm
2
of copper Board heat-sink.
DocID2511 Rev 19
5/23
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