L78M
Precision 500 mA regulators
Datasheet
-
production data
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.
TO-220
TO-220FP
DPAK
IPAK
Features
•
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
June 2014
This is information on a product in full production.
DocID2146 Rev 20
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Contents
L78M
Contents
1
2
3
4
5
6
7
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1
Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8
9
10
11
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
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L78M
Maximum ratings
3
Maximum ratings
Table 1. Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
DC input voltage
Output current
Power dissipation
Parameter
for V
O
= 5 to 18 V
for V
O
= 20, 24 V
Value
35
Unit
V
40
Internally limited
Internally limited
- 65 to 150
mA
mW
°C
Storage temperature range
for L78MxxAC
0 to 125
-40 to 125
0 to 150
°C
T
OP
Operating junction temperature range for L78MxxAB
for L78MxxC
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
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