L78M
Datasheet
Precision 500 mA regulators
Features
•
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•
•
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Output current to 0.5 A
Output voltages of 5; 6; 8; 9; 10; 12; 15; 24 V
Thermal overload protection
Short circuit protection
Output transition SOA protection
Output voltage tolerance: 2 % (AB and AC versions) or 4 % (C version)
Guaranteed in extended temperature range
TO-220
TO-220FP
DPAK
IPAK
Description
The
L78M
series of three-terminal positive regulators is available in TO-220,
TO-220FP, DPAK and IPAK packages and with 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 employs internal current limiting, thermal shutdown and safe
area protection, resulting it essentially indestructible. If adequate heat sinking is
provided, they can deliver over 0.5 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
L78M
DS0425
-
Rev 24
-
September 2020
For further information contact your local STMicroelectronics sales office.
www.st.com
L78M
Maximum ratings
3
Maximum ratings
Table 1.
Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
Storage temperature range
for L78MxxAC
T
OP
Operating junction temperature range
for L78MxxAB
for L78MxxC
DC input voltage
Output current
Power dissipation
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
0 to 150
°C
Unit
V
mA
mW
°C
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
TO-220
5
50
TO-220FP
5
60
DPAK
8
100
IPAK
8
100
Unit
°C/W
°C/W
Figure 4.
Application circuit
AMG080320171803MT
DS0425
-
Rev 24
page 5/45