Features
627
72
62
• 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 pr otection
• No external components are required
• Available in either ± 4% (A) or ± 8% (C)
selection
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 oncard 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.
February 2015 DocID2145 Rev 24 1/46
This is information on a product in full production.
www.st.com
Contents L78L
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 TO-92 package i n formation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 TO-92 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3 TO-92 Ammopack packing information . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.4 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.5 SO-8 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.6 SOT-89 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.7 SOT-89 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2/46 DocID2145 Rev 24
L78L Diagram
1 Diagram
Figure 1. Schematic diagram
DocID2145 Rev 24 3/46
46
Pin configuration L78L
SOT-89
SO-8
TO-92
PIN 1 = V
OUT
PIN 2 = GND
PIN 3 = V
IN
2 Pin configuration
Figure 2. Pin connection (top view, bottom view for TO-92)
Figure 3. Test circuits
4/46 DocID2145 Rev 24
L78L Maximum ratings
3 Maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
= 3.3 to 9 V 30
V
O
VV
mW
°C
T
P
T
V
I
STG
OP
DC Input voltage
I
Output current 100 mA
O
Power dissipation Internally limited
D
= 12 to 15 V 35
O
V
= 18 to 24 V 40
O
Storage temperature range -65 to 150 °C
Operating junction temperature range
for L78LxxAC /
L78LxxC
0 to 125
(1)
for L78LxxAB -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 Parameter SO-8 TO-92 SOT-89 Unit
R
thJC
R
thJA
1. Considering 6 cm² of copper Board heat-sink.
Thermal resistance junction-case (max) 20 15 °C/W
Thermal resistance junction-ambient (max) 55
(1)
200 55
(1)
°C/W
DocID2145 Rev 24 5/46
46
Electrical charac teristics L78L
4 Electrical characteristics
Refer to the test circuits, TJ = 0 to 125 °C, VI = 8.3 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Symbol Parameter Test conditions Min. Typ. Max. Unit
Table 3. Electrical characteristics of L78L33C
V
V
DV
DV
DI
Output voltage TJ = 25 °C 3.036 3.3 3.564 V
O
I
= 1 to 40 mA, VI = 5.3 to 20 V 2.97 3.63
Output voltage
O
Line regulation
O
Load regulation
O
I
Quiescent curr ent
d
Quiescent current change
d
O
= 1 to 70 mA, VI = 8.3 V 2.97 3.63
I
O
V
= 5.3 to 20 V, TJ = 25 °C 150
I
= 6.3 to 20 V, TJ = 25 °C 100
V
I
= 1 to 100 mA, TJ = 25 °C 60
I
O
IO = 1 to 40 mA, TJ = 25 °C 30
T
= 25 °C 6 mA
J
T
= 125 °C 5.5 mA
J
I
= 1 to 40 mA 0.2
O
= 6.3 to 20 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, T
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
VI = 6.3 to 16.3 V, f = 120 Hz
I
= 40 mA, TJ = 25 °C
O
= 25 °C 40 µV
J
41 49 dB
V
mV
mV
mA
6/46 DocID2145 Rev 24
L78L Electrical chara cter ist ics
Refer to the test circuits, TJ = 0 to 125 °C, VI = 10 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 4. Electrical characteristics of L78L05C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 4.6 5 5.4 V
O
= 1 to 40 mA, VI = 7 to 20 V 4.5 5.5
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 10 V 4.5 5.5
V
= 8.5 to 20 V, TJ = 25 °C 200
I
= 9 to 20 V, TJ = 25 °C 150
V
I
I
= 1 to 100 mA, TJ = 25 °C 60
O
= 1 to 40 mA, TJ = 25 °C 30
I
O
= 25 °C 6 mA
T
J
TJ = 125 °C 5.5 mA
I
= 1 to 40 mA 0.2
O
= 8 to 20 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 40 µV
V
= 9 to 20 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
40 49 dB
V
mV
mV
mA
DocID2145 Rev 24 7/46
46
Electrical charac teristics L78L
Refer to the test circuits, TJ = 0 to 125 °C,VI = 14 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Symbol Parameter Test conditions Min. Typ. Max. Unit
Table 5. Electrical characteristics of L78L08C
V
V
DV
DV
DI
Output voltage TJ = 25 °C 7.36 8 8.64 V
O
= 1 to 40 mA, VI = 8.5 to 20 V 7.2 8.8
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 12 V 7.2 8.8
V
= 8.5 to 20 V, TJ = 25 °C 200
I
= 9 to 20 V, TJ = 25 °C 150
V
I
I
= 1 to 100 mA, TJ = 25 °C 80
O
= 1 to 40 mA, TJ = 25 °C 40
I
O
= 25 °C 6 mA
T
J
TJ = 125 °C 5.5 mA
I
= 1 to 40 mA 0.2
O
= 8 to 20 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 60 µV
V
= 9 to 20 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
36 45 dB
V
mV
mV
mA
8/46 DocID2145 Rev 24
L78L Electrical chara cter ist ics
Refer to the test circuits, TJ = 0 to 125 °C, VI = 15 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 6. Electrical characteristics of L78L09C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 8.28 9 9.72 V
O
= 1 to 40 mA, VI = 11.5 to 23 V 8.1 9.9
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 15 V 8.1 9.9
V
= 11.5 to 23 V, TJ = 25 °C 250
I
= 12 to 23 V, TJ = 25 °C 200
V
I
I
= 1 to 100 mA, TJ = 25 °C 80
O
= 1 to 40 mA, TJ = 25 °C 40
I
O
= 25 °C 6 mA
T
J
TJ = 125 °C 5.5 mA
I
= 1 to 40 mA 0.2
O
= 12 to 23 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 70 µV
V
= 12 to 23 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
36 44 dB
V
mV
mV
mA
DocID2145 Rev 24 9/46
46
Electrical charac teristics L78L
Refer to the test circuits, TJ = 0 to 125 °C, VI = 16 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 7. Electrical characteristics of L78L10C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 9.2 10 10.8 V
O
= 1 to 40 mA, VI = 12.5 to 23 V 9 11
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 16 V 9 11
V
= 12.5 to 23 V, TJ = 25 °C 230
I
= 13 to 23 V, TJ = 25 °C 170
V
I
I
= 1 to 100 mA, TJ = 25 °C 80
O
= 1 to 40 mA, TJ = 25 °C 40
I
O
= 25 °C 6 mA
T
J
TJ = 125 °C 5.5 mA
I
= 1 to 40 mA 0.1
O
= 13 to 23 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 60 µV
V
= 14 to 23 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
37 45 dB
V
mV
mV
mA
10/46 DocID2145 Rev 24
L78L Electrical chara cter ist ics
Refer to the test circuits, TJ = 0 to 125 °C, VI = 19 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 8. Electrical characteristics of L78L12C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 11.1 12 12.9 V
O
= 1 to 40 mA, VI = 14.5 to 27 V 10.8 13.2
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 19 V 10.8 13.2
V
= 14.5 to 27 V, TJ = 25 °C 250
I
= 16 to 27 V, TJ = 25 °C 200
V
I
I
= 1 to 100 mA, TJ = 25 °C 100
O
= 1 to 40 mA, TJ = 25 °C 50
I
O
= 25 °C 6.5 mA
T
J
TJ = 125 °C 6 mA
I
= 1 to 40 mA 0.2
O
= 16 to 27 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 80 µV
V
= 15 to 25 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
36 42 dB
V
mV
mV
mA
DocID2145 Rev 24 11/46
46
Electrical charac teristics L78L
Refer to the test circuits, TJ = 0 to 125 °C, VI = 23 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified
Table 9. Electrical characteristics of L78L15C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 13.8 15 16.2 V
O
= 1 to 40 mA, VI = 17.5 to 30 V 13.5 16.5
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 23 V 13.5 16.5
V
= 17.5 to 30 V, TJ = 25 °C 300
I
= 20 to 30 V, TJ = 25 °C 250
V
I
I
= 1 to 100 mA, TJ = 25 °C 150
O
= 1 to 40 mA, TJ = 25 °C 75
I
O
= 25 °C 6.5 mA
T
J
TJ = 125 °C 6 mA
I
= 1 to 40 mA 0.2
O
= 20 to 30 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 90 µV
V
= 18.5 to 28.5 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
33 39 dB
V
mV
mV
mA
12/46 DocID2145 Rev 24
L78L Electrical chara cter ist ics
Refer to the test circuits, TJ = 0 to 125 °C, VI = 27 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 10. Electrical characteristics of L78L18C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 16.6 18 19.4 V
O
= 1 to 40 mA, VI = 22 to 33 V 16.2 19.8
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 27 V 16.2 19.8
V
= 22 to 33 V, TJ = 25 °C 320
I
= 22 to 33 V, TJ = 25 °C 270
V
I
I
= 1 to 100 mA, TJ = 25 °C 170
O
= 1 to 40 mA, TJ = 25 °C 85
I
O
= 25 °C 6.5 mA
T
J
TJ = 125 °C 6 mA
I
= 1 to 40 mA 0.2
O
= 23 to 33 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 120 µV
V
= 23 to 33 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
32 38 dB
V
mV
mV
mA
DocID2145 Rev 24 13/46
46
Electrical charac teristics L78L
Refer to the test circuits, TJ = 0 to 125 °C, VI = 33 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
T able 11. Electrical characteristics of L78L24C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
DV
DV
DI
Output voltage TJ = 25 °C 22.1 24 25.9 V
O
= 1 to 40 mA, VI = 27 to 38 V 21.6 26.4
I
Output voltage
O
Line regulation
O
Load regulation
O
Quiescent curr ent
I
d
Quiescent current change
d
O
IO = 1 to 70 mA, VI = 33 V 21.6 26.4
V
= 27 to 38 V, TJ = 25 °C 350
I
= 28 to 38 V, TJ = 25 °C 300
V
I
I
= 1 to 100 mA, TJ = 25 °C 200
O
= 1 to 40 mA, TJ = 25 °C 100
I
O
= 25 °C 6.5 mA
T
J
TJ = 125 °C 6 mA
I
= 1 to 40 mA 0.2
O
= 28 to 38 V 1.5
V
I
eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 200 µV
V
= 29 to 35 V, f = 120 Hz
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25 °C
30 37 dB
V
mV
mV
mA
14/46 DocID2145 Rev 24
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