Document
TO-92
SO-8
SOT-89
L78L
Datasheet
Positive voltage regulators
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
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.
Maturity status link L78L
DS0424 - Rev 28 - April 2021 For further information contact your local STMicroelectronics sales office.
www.st.com
1
Diagram
Figure 1. Schematic diagram
L78L
Diagram
AMG160520161300MT
DS0424 - Rev 28
page 2/40
L78L
Pin configuration
2
Pin configuration
Figure 2. Pin connection (top view, bottom view for TO-92)
Figure 3. Test circuits
AMG160520161301MT
AMG160520161302MT
DS0424 - Rev 28
page 3/40
L78L
Maximum ratings
3
Maximum ratings
Table 1. Absolute maximum ratings
Symbol
Parameter
Value
VI
IO PD TSTG TOP
DC Input voltage
Output current Power dissipation Storage temperature range Operating junction temperature range
VO = 3.3 to 9 V VO = 12 to 15 V VO = 18 to 24 V
for L78LxxAC / L78LxxC for L78LxxAB
30 35 40 100 Internally limited (1) -65 to 150 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
Parameter
RthJC
Thermal resistance junction-case (max)
RthJA
Thermal resistance junction-ambient (max)
1. Considering 6 cm² of copper Board heat-sink.
SO-8 20
55 (1)
TO-92 200
SOT-89 15
55 (1)
Unit V mA
mW °C °C
Unit °C/W °C/W
DS0424 - Rev 28
page 4/40
L78L
Electrical characteristics
4
Electrical characteristics
Table 3. Electrical characteristics of L78L33C - 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
VO VO ∆VO ∆VO Id ∆Id eN SVR Vd
Output voltage Output voltage Line regulation Load regulation Quiescent current Quiescent current change Output noise voltage Supply voltage rejection Dropout voltage
TJ = 25 °C IO = 1 to 40 mA, VI = 5.3 to 20 V
IO = 1 to 70 mA, VI = 8.3 V VI = 5.4 to 20 V, TJ = 25 °C VI = 6.3 to 20 V, TJ = 25 °C IO = 1 to 100 mA, TJ = 25 °C IO = 1 to 40 mA, TJ = 25 °C
TJ = 25 °C TJ = 125 °C IO = 1 to 40 mA VI = 6.3 to 20 V B = 10 Hz to 100 kHz, TJ = 25 °C VI = 6.3 to 16.3 V, f = 120 Hz IO = 40 mA, TJ = 25 °C
3.036 2.97 2.97
41
3.3
3.564
V
3.63 V
3.63
150 mV
100
60 mV
30
6
mA
5.5
mA
0.2 mA
1.5
40
µV
49
dB
2
V
Table 4. Electrical characteristics of L78L05C - 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
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO VO ∆VO ∆VO Id ∆Id eN SVR Vd
Output voltage
TJ = 25 °C
4.6
5
Output voltage
IO = 1 to 40 mA, VI = 7 to 20 V
4.5
IO = 1 to 70 mA, VI = 10 V
4.5
Line regulation
VI = 8.5 to 20 V, TJ = 25 °C VI = 9 to 20 V, TJ = 25 °C
Load regulation
IO = 1 to 100 mA, TJ = 25 °C IO = 1 to 40 mA, TJ = 25 °C
Quiescent current
TJ = 25 °C TJ = 125 °C
Quiescent current change
IO = 1 to 40 mA VI = 8 to 20 V
Output noise voltage
B = 10 Hz to 100 kHz, TJ = 25 °C
40
Supply voltage rejection
VI = 9 to 20 V, f = 120 Hz IO = 40 mA, TJ = 25 °C
40
49
Dropout voltage
2
5.4
V
5.5 V
5.5
200 mV
150
60 mV
30
6
mA
5.5
mA
0.2 mA
1.5
µV
dB
V
DS0424 - Rev 28
page 5/40
L78L
Electrical characteristics
Table 5. Electrical characteristics of L78L08C - 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
VO
Output voltage
TJ = 25 °C
7.36
8
8.64
V
IO = 1 to 40 mA, VI = 8.5 to 20 V
7.2
VO
Output voltage
IO = 1 to 70 mA, VI = 12 V
7.2
8.8 V
8.8
VI = 10.5 to 20 V, TJ = 25 °C
∆VO
Line regulation
VI = 11 to 20 V, TJ = 25 °C
200 mV
150
IO = 1 to 100 mA.