L7800AB/AC series
Precision 1A regulators
Feature summary
■
■
■
■
■
■
Output current in excess of 1A
Output voltages of 5; 6; 8; 9; 12; 15; 18; 20; 24V
Thermal overload protection
Output transition SOA protection
2% Output voltage tolerance
Guaranteed in extended temperature range
TO-220
TO-220FP
Description
The L7800A series of three terminal positive
regulators is available in TO-220, TO-220FP, and
D
2
PAK 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
problem 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
D
2
PAK
deliver over 1A output current, Although designed
primarily as fixed voltage regulators, these
devices can be used with external components to
obtain adjustable voltage and currents.
Schematic diagram
January 2007
Rev. 11
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www.st.com
28
L7800AB/AC series
Contents
1
2
3
4
5
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Test circuits
............................................... 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1
Design consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6
7
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Order code
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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Maximum ratings
L7800AB/AC series
2
Table 1.
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
for L7800AC
Operating junction temperature range
for L7800AB
-40 to 125
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
°C
mA
mW
°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
D
2
PAK
3
62.5
Unit
°C/W
°C/W
Table 2.
Symbol
R
thJC
R
thJA
Figure 3.
Application circuits
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