L78
Datasheet
Positive voltage regulator ICs
Features
•
•
•
•
•
•
•
Output current up to 1.5 A
Output voltages of 5; 6; 8; 8.5; 9; 12; 15; 18; 24 V
Thermal overload protection
Short circuit protection
Output transition SOA protection
2 % output voltage tolerance (A version)
Guaranteed in extended temperature range (A version)
TO-220
TO-220FP
DPAK
D²PAK
Description
The
L78
series of three-terminal positive regulators is available in TO-220,
TO-220FP, D²PAK and DPAK packages and several fixed output voltages, making it
useful in a wide range of applications.
These regulators can provide local on-card regulation, eliminating the distribution
problems associated with single point regulation. Each type embeds internal current
limiting, thermal shut-down and safe area protection, making it essentially
indestructible. If adequate heat sinking is provided, they can deliver over 1 A output
current. Although designed primarily as fixed voltage regulators, these devices can
be used with external components to obtain adjustable voltage and currents.
Maturity status link
L78
DS0422
-
Rev 36
-
September 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
L78
Maximum ratings
3
Maximum ratings
Table 1.
Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
T
OP
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
for L78xxC, L78xxAC
for L78xxAB
Parameter
for V
O
= 5 to 18 V
for V
O
= 20, 24 V
Value
35
40
Internally limited
Internally limited
-65 to 150
0 to 125
-40 to 125
°C
°C
Unit
V
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional
operation under these condition is not implied.
Table 2.
Thermal data
Symbol
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
D²PAK
3
62.5
DPAK
8
100
TO-220
5
50
TO-220FP
5
60
Unit
°C/W
°C/W
Figure 5.
Application circuits
GAMG220920161003MT
DS0422
-
Rev 36
page 4/55