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AX78XX Series
3-Terminal Positive Voltage Regulators
AX78XX Series Pin Assignment
Tab
3-Lead Plastic
TO-252
Package Code: J
Pin 1: V
IN
Pin 2 & Tab: GND
Pin 3: V
OUT
Description
The AX78XX series can provide local on-card regulation, eliminating the
distribution problems associated with single point regulation. Each employs
internal current limiting, thermal shut-down and safe operating area protection,
making it essen-tially indestructible. If adequate heat sinking is provided, they can
deliver over 1A output current. Although designed primarily as fixed voltage
regulators, these devices can be used with external components to obtain
adjustable voltages and currents.
Tab
1
2
3
3-Lead Plastic
TO-251
Package Code: I
Pin 1: V
IN
Pin 2 & Tab: GND
Pin 3: V
OUT
1
2
3
3-Lead Plastic
SOT-82
Package Code: NE
Pin 1: V
IN
Pin 2: GND
Pin 3: V
OUT
1
2
3
Features
•
Output Current In Excess of 1A
•
Output Voltages of 5V, 6V, 8V, 9V, 12V
•
Internal Short-Circuit Current Limiting & Thermal Overload Protection
•
Guaranteed In Extended Temperature Range
Absolute Maximum Ratings
(T =25°C)
A
Tab
Characteristic
Input Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Junction Temperature
Symbol
V
IN
P
D
T
opr
T
stg
T
j
Rating
40
Internally limited
(Note)
-30 to 85
-55 to 150
150
Unit
V
o
o
o
C
C
C
1
2
3-Lead Plastic
TO-220AB
Package Code: E
Pin 1: V
IN
Pin 2 & Tab: GND
Pin 3: V
OUT
3
Note: (1)T
A
=25
o
C, TO-251: 1W, TO-252: 1W, SOT-82: 2.1W, TO-220AB: 2.7W
(2)T
C
=25
o
C, All package: 10W
Thermal Data
Characteristic
Thermal Resistance Junction-Case
Thermal Resistance Junction-Ambient
Symbol
R
th(j-c)
R
th(j-a)
TO-252
12.5
125
TO-251
12.5
125
SOT-82
12.5
60
TO-220AB
12.5
47
Unit
o
o
C/W
C/W
Schematic Diagram & Equivalent Circuit
Schematic Diagram
Input
1
Equivalent Circuit
Series
Pass
Element
Output
3
V
IN
Current
Generator
SOA
Protection
Starting
Circuit
Reference
Voltage
Error
Amplifier
Thermal
Protection
GND
2
V
OUT
AVANTICS - AX78XX Series
Specification No.: 050308-FE0003
Embedded System
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