L78L00 series
Positive voltage regulators
Features
■
■
■
■
■
■
Output current up to 100 mA
Output voltages of 3.3; 5; 6; 8; 9; 12; 15; 18;
24V
Thermal overload protection
Short circuit protection
No external components are required
Available in either ±5% (AC) or ±10% (C)
selection
SO-8
SOT-89
TO-92
Description
The L78L00 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 L78L00 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.
Schematic diagram
June 2007
Rev. 13
1/30
www.st.com
30
L78L00 series
Contents
1
2
3
4
5
6
7
8
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Order code
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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L78L00 series
Pin configuration
1
Figure 1.
Pin configuration
Pin Connection
(top view, bottom view for TO-92)
PIN 1 = V
OUT
PIN 2 = GND
PIN 3 = V
IN
SO-8
SOT-89
TO-92
Figure 2.
Test circuits
3/30
Maximum ratings
L78L00 series
2
Table 1.
Symbol
Maximum ratings
Absolute maximum ratings
Parameter
V
O
= 3.3 to 9V
V
I
DC Input voltage
V
O
= 12 to 15V
V
O
= 18 to 24V
I
O
P
D
T
STG
T
OP
Output current
Power dissipation
Storage temperature range
for L7800AC
Operating junction temperature range
for L7800AB
-40 to 125
Value
30
35
40
100
Internally Limited
(1)
-65 to 150
0 to 150
°C
mA
mW
°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.
Symbol
R
thJC
R
thJA
1.
Thermal Data
Parameter
Thermal resistance junction-case. (Max)
Thermal resistance junction-ambient. (Max)
SO-8
20
55
(1)
200
TO-92
SOT-89
15
Unit
°C/W
°C/W
Considering 6 cm
2
of copper Board heat-sink.
4/30
L78L00 series
Electrical characteristics
3
Table 3.
Symbol
V
O
V
O
ΔV
O
ΔV
O
Electrical characteristics
Electrical characteristics of L78L33C
(refer to the test circuits, T
J
= 0 to 125°C, V
I
= 8.3V,
I
O
= 40 mA, C
I
= 0.33 µF, C
O
= 0.1 µF unless otherwise specified)
Parameter
Output voltage
Output voltage
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
Line regulation
V
I
= 5.3 to 20 V, T
J
= 25°C
V
I
= 6.3 to 20 V, T
J
= 25°C
Load regulation
I
O
= 1 to 100 mA, T
J
= 25°C
I
O
= 1 to 40 mA, T
J
= 25°C
Quiescent current
T
J
= 25°C
T
J
= 125°C
Quiescent current change
Output noise voltage
Supply voltage rejection
Dropout voltage
I
O
= 1 to 40 mA
V
I
= 6.3 to 20 V
B =10Hz to 100KHz, T
J
= 25°C
V
I
= 6.3 to 16.3 V, f = 120Hz
I
O
= 40 mA, T
J
= 25°C
41
40
49
1.7
Test conditions
Min.
3.036
2.97
2.97
Typ.
3.3
Max.
3.564
3.63
V
3.63
150
mV
100
60
mV
30
6
5.5
0.2
mA
1.5
µV
dB
V
mA
mA
Unit
V
I
d
ΔI
d
eN
SVR
V
d
5/30
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