L78LxxAB,
L78LxxAC, L78LxxC
Positive voltage regulators
Datasheet — production data
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% (AC) or ± 8% (C)
selection
SO-8
SOT-89
TO-92
Description
The L78Lxx 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 L78Lxx series used as
Zener diode/resistor combination replacement,
offers an effective output impedance improvement
Table 1.
Device summary
Part numbers
L78L33C
L78L33AC
L78L33AB
L78L05C
L78L05AC
L78L05AB
L78L06AC
L78L06AB
L78L08C
September 2012
This is information on a product in full production.
of typically two orders of magnitude, along with
lower quiescent current and lower noise.
L78L08AC
L78L08AB
L78L09C
L78L09AC
L78L09AB
L78L10AC
L78L12C
L78L12AC
L78L12AB
Doc ID 2145 Rev 21
L78L15C
L78L15AC
L78L15AB
L78L18C
L78L18AC
L78L24C
L78L24AC
L78L24AB
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Contents
L78LxxAB, L78LxxAC, L78LxxC
Contents
1
2
3
4
5
6
7
8
9
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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Doc ID 2145 Rev 21
L78LxxAB, L78LxxAC, L78LxxC
Diagram
1
Figure 1.
Diagram
Schematic diagram
Doc ID 2145 Rev 21
3/33
Pin configuration
L78LxxAB, L78LxxAC, L78LxxC
2
Figure 2.
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 3.
Test circuits
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Doc ID 2145 Rev 21
L78LxxAB, L78LxxAC, L78LxxC
Maximum ratings
3
Table 2.
Symbol
Maximum ratings
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
for L78L00AC
Operating junction temperature range
for L78L00AB
-40 to 125
Value
30
35
40
100
Internally limited
(1)
-65 to 150
0 to 125
°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 3.
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
55
(1)
Unit
°C/W
°C/W
Considering 6 cm² of copper Board heat-sink.
Doc ID 2145 Rev 21
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