L78L
Positive voltage regulators
Datasheet - production data
Description
The L78L series of three-terminal positive
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 L78L series used as
Zener diode/resistor combination replacement,
offers e improvement along with lower quiescent
current and lower noise.
Features
Output current up to 100 mA
Output voltages of 3.3; 5; 6; 8; 9; 10; 12; 15;
18; 24 V thermal overload protection
Short-circuit protection
No external components are required
Available in either ± 4% (A) or ± 8% (C)
selection
June 2016
DocID2145 Rev 26
1/45
www.st.com
This is information on a product in full production.
Contents
L78L
Contents
1
2
3
4
5
6
7
Diagram ............................................................................................ 3
Pin configuration ............................................................................. 4
Maximum ratings ............................................................................. 5
Electrical characteristics ................................................................ 6
Typical performance ..................................................................... 25
Typical application ........................................................................ 27
Package information ..................................................................... 29
7.1
7.2
7.3
7.4
7.5
7.6
7.7
TO-92 package information ............................................................. 29
TO-92 packing information .............................................................. 30
TO-92 Ammopak packing information ............................................. 32
SO-8 package information .............................................................. 34
SO-8 packing information ................................................................ 36
SOT-89 package information .......................................................... 37
SOT-89 packing information............................................................ 40
8
9
Ordering information..................................................................... 41
Revision history ............................................................................ 44
2/45
DocID2145 Rev 26
L78L
Diagram
1
Diagram
Figure 1: Schematic diagram
DocID2145 Rev 26
3/45
Pin
configuration
L78L
2
Pin configuration
Figure 2: Pin connection (top view, bottom view for TO-92)
Figure 3: Test circuits
4/45
DocID2145 Rev 26
L78L
Maximum
ratings
3
Symbol
Maximum ratings
Table 1: Absolute maximum ratings
Parameter
V
O
= 3.3 to 9 V
V
I
DC Input voltage
V
O
= 12 to 15 V
V
O
= 18 to 24 V
I
O
P
D
T
STG
T
OP
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
for L78LxxAC / L78LxxC
for L78LxxAB
Value
30
35
40
100
Internally limited
(1)
-65 to 150
0 to 125
-40 to 125
mA
mW
°C
°C
V
Unit
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
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
55
(1)
Considering 6 cm² of copper Board heat-sink.
DocID2145 Rev 26
5/45
京公网安备 11010802033920号
EEWORLD
