L78L
Datasheet
Positive voltage regulators
Features
TO-92
•
•
•
•
•
SO-8
SOT-89
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
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.
Maturity status link
L78L
DS0424
-
Rev 28
-
April 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
L78L
Diagram
1
Diagram
Figure 1.
Schematic diagram
AMG160520161300MT
DS0424
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Rev 28
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L78L
Pin configuration
2
Pin configuration
Figure 2.
Pin connection (top view, bottom view for TO-92)
AMG160520161301MT
Figure 3.
Test circuits
AMG160520161302MT
DS0424
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Rev 28
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L78L
Maximum ratings
3
Maximum ratings
Table 1.
Absolute maximum ratings
Symbol
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
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
Parameter
Thermal resistance junction-case (max)
Thermal resistance junction-ambient (max)
SO-8
20
55
(1)
200
TO-92
SOT-89
15
55
(1)
Unit
°C/W
°C/W
1. Considering 6 cm² of copper Board heat-sink.
DS0424
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Rev 28
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L78L
Electrical characteristics
4
Electrical characteristics
Table 3.
Electrical characteristics of L78L33C - Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= 8.3 V, I
O
= 40 mA, C
I
= 0.33
µF, C
O
= 0.1 µF unless otherwise specified
Symbol
V
O
V
O
Parameter
Output voltage
Output voltage
Test conditions
T
J
= 25 °C
I
O
= 1 to 40 mA, V
I
= 5.3 to 20 V
I
O
= 1 to 70 mA, V
I
= 8.3 V
V
I
= 5.4 to 20 V, T
J
= 25 °C
V
I
= 6.3 to 20 V, T
J
= 25 °C
I
O
= 1 to 100 mA, T
J
= 25 °C
I
O
= 1 to 40 mA, T
J
= 25 °C
T
J
= 25 °C
T
J
= 125 °C
I
O
= 1 to 40 mA
V
I
= 6.3 to 20 V
B = 10 Hz to 100 kHz, T
J
= 25 °C
V
I
= 6.3 to 16.3 V, f = 120 Hz
I
O
= 40 mA, T
J
= 25 °C
41
40
49
2
Min.
3.036
2.97
2.97
Typ.
3.3
Max.
3.564
3.63
3.63
150
100
60
30
6
5.5
0.2
1.5
Unit
V
V
∆V
O
Line regulation
mV
∆V
O
Load regulation
mV
mA
mA
mA
µV
dB
V
I
d
Quiescent current
∆I
d
eN
SVR
V
d
Quiescent current change
Output noise voltage
Supply voltage rejection
Dropout voltage
Table 4.
Electrical characteristics of L78L05C - Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= 10 V, I
O
= 40 mA, C
I
= 0.33
µF, C
O
= 0.1 µF unless otherwise specified
Symbol
V
O
V
O
Parameter
Output voltage
Output voltage
T
J
= 25 °C
I
O
= 1 to 40 mA, V
I
= 7 to 20 V
I
O
= 1 to 70 mA, V
I
= 10 V
V
I
= 8.5 to 20 V, T
J
= 25 °C
V
I
= 9 to 20 V, T
J
= 25 °C
I
O
= 1 to 100 mA, T
J
= 25 °C
I
O
= 1 to 40 mA, T
J
= 25 °C
T
J
= 25 °C
T
J
= 125 °C
I
O
= 1 to 40 mA
V
I
= 8 to 20 V
B = 10 Hz to 100 kHz, T
J
= 25 °C
V
I
= 9 to 20 V, f = 120 Hz
I
O
= 40 mA, T
J
= 25 °C
40
40
49
2
Test conditions
4.6
4.5
4.5
Min.
5
Typ.
5.4
5.5
5.5
200
150
60
30
6
5.5
0.2
1.5
Max.
V
V
Unit
∆V
O
Line regulation
mV
∆V
O
Load regulation
mV
mA
mA
mA
µV
dB
V
I
d
Quiescent current
∆I
d
eN
SVR
V
d
Quiescent current change
Output noise voltage
Supply voltage rejection
Dropout voltage
DS0424
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Rev 28
page 5/40
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