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
•
Available in ±5% (AC) or ± 10% (C) selection
April 2014
This is information on a product in full production.
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Contents
L79L
Contents
1
2
3
4
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1
4.2
4.3
TO-92 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SO-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
SOT-89 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1
5.2
5.3
5.4
Tape and reel for TO-92 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Tape and reel for TO-92 Ammopak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Tape and reel for SOT-89 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Tape and reel for SO-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6
7
Order codes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
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L79L
Diagram
1
Diagram
Figure 1. Schematic diagram
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Pin configuration
L79L
2
Pin configuration
Figure 2. Pin connection
(top view, bottom view for TO-92)
PIN 1 = GND
PIN 2 = V
IN
PIN 3 = V
OUT
SO-8
SOT-89
TO-92
Figure 3. Test circuit
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L79L
Maximum ratings
3
Maximum ratings
Table 1. Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
T
OP
DC input voltage
Output current
Power dissipation
Parameter
V
O
= -5 to -9 V
V
O
= -12 to -15 V
Value
-30
Unit
V
-35
100
Internally limited
(1)
-40 to 150
mA
mW
°C
°C
Storage temperature range
For L79LXXAC
Operating junction temperature range
For L79LXXAB
0 to 125
-40 to 125
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
R
thJC
R
thJA
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.
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