L78MxxC
Positive voltage regulators
Features
■
■
■
■
■
Output current to 0.5 A
Output voltages of 5; 6; 8; 9; 12; 15; 18; 24 V
Thermal overload protection
Short circuit protection
Output transition SOA protection
TO-220
TO-220FP
Description
The L78Mxx 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 shut-down and safe area
protection, making 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.
DPAK
IPAK
Table 1.
Device summary
Part numbers
L78M05C
L78M06C
L78M08C
L78M09C
L78M12C
L78M15C
L78M18C
L78M24C
Rev 11
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www.st.com
29
February 2008
Contents
L78MxxC
Contents
1
2
3
4
5
6
7
8
9
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Test circuits
............................................... 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Order codes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2/29
L78MxxC
Maximum ratings
3
Table 2.
Symbol
V
I
I
O
P
D
T
STG
T
OP
Maximum ratings
Absolute maximum ratings
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
for V
O
= 5 to 18V
for V
O
= 20, 24V
Value
35
V
40
Internally limited
Internally limited
-65 to 150
0 to 150
mA
mW
°C
°C
Unit
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
TO-220
3
50
TO-220FP
5
60
DPAK
8
100
IPAK
Unit
°C/W
°C/W
Table 3.
Symbol
R
thJC
R
thJA
Figure 4.
Application circuits
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