Data Sheet
3-TERMINAL POSITIVE LINEAR REGULATOR
General Description
The AZ78LXX series are three terminal positive regu-
lators with several fixed output voltages. These regula-
tors can provide local on card regulation, eliminating
the distribution problems associated with single point
regulation. The AZ78LXX can be used in logic sys-
tems, instrumentation, HiFi, and other solid state elec-
tronic equipment. When used as a Zener diode/resistor
combination replacement, the AZ78LXX usually
results an effective output impedance improvement of
two orders of magnitude, and lower quiescent current.
With adequate heat sinking the AZ78LXX can deliver
100 mA output current. Current limiting is included to
limit the peak output current to a safe value. Thermal
protection is also provided. If internal power
dissipation becomes too high for the heat sinking
provided, the thermal shutdown circuit takes over
preventing the IC from overheating.
The AZ78LXX are available in the plastic TO-92,
SOIC-8, SOT-223 and SOT-89 packages.
AZ78LXX
Features
·
·
·
·
·
·
Output Current up to 100 mA
Fixed Output Voltage of 5V, 8V, 9V and 12V
Output Voltage Tolerances of
±
5% over the Full
Temperature Range
Internal Short Circuit Current-Limiting
Internal Thermal Overload Protection
No External Components
Applications
·
·
·
·
High Efficiency Linear Regulator
Post Regulation for Switching Supply
Microprocessor Power Supply
Mother Board I/O Power Supply
TO-92
SOIC-8
SOT-223
SOT-89
Figure 1. Package Types of the AZ78LXX
Apr. 2005 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
1
Data Sheet
3-TERMINAL POSITIVE LINEAR REGULATOR
Absolute Maximum Ratings (Note 1)
Parameter
Input Voltage
Operating Junction Temperature Range
Lead Temperature (Soldering, 10sec)
Power Dissipation (T
A
=25
o
C)
Symbol
V
CC
T
J
T
LEAD
P
D
TO-92
SOIC-8
SOT-223
SOT-89
Storage Temperature Range
ESD (Machine Model)
T
STG
-65 to 150
300
Value
20
0 to125
265
0.65
0.6
0.7
0.65
o
AZ78LXX
Unit
V
o
C
o
C
W
C
V
N
ote 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Operating Junction Temperature Range
Symbol
T
J
Min
0
Max
125
Unit
o
C
Apr. 2005 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
5
Analog electronics
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