LM309K
Voltage Regulators
GENERAL DESCRIPTION
The LM309K is complete 5V regulator fabricated on a single silicon chip.
The available output current is greater than 1A.
He is designed for local regulation on digital logic cards, eliminating the distribution problems
associated with single-point regulation. The devices are available in the TO3 power package.
The regulators are essentially blow-out proof. Current limiting is included to limit the peak output
current to a safe value. In addition, thermal shutdown is provided to keep the IC from overheating. If
internal dissipation becomes too great, the regulator will shut down to prevent excessive heating.
Considerable effort was expended to make these devices easy to use and minimize the number of
external components. It is not necessary to bypass the output, although this does improve transient
response somewhat. Input bypassing is needed, however, if the regulator is located very far from the
filter capacitor of the power supply. Stability is also achieved by methods that provide very good
rejection of load or line transients as are usually seen with TTL logic.
Compliance to RoHS.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Output Current
Power Dissipation
Operating Junction Temperature Range
Storage Temperature Range
35V
1A
Internally Limited
0° to 125°C
-65° to 150°C
CHARACTERISTICS (1)
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Output Voltage
Quiescent Current
Quiescent Current Change
Output Noise Voltage
Long Term Stability
Thermal Resistance
Junction to case
CONDITIONS
T
j
= 25°C
T
j
= 25°C
7V
≤V
IN
≤25V
T
j
=25°C
5mA
≤I
OUT
≤1.5A
7V
≤V
IN
≤25V
5mA
≤I
OUT
≤
I
MAX
P<P
MAX
7V
≤V
IN
≤25V
7V
≤V
IN
≤25V
5mA
≤I
OUT
≤
I
MAX
T
A
= 25°C
10H
Z
≤
f
≤
(2)
MIN
4.8
-
-
4.75
-
-
-
-
-
TYP
5.05
4
50
-
5.2
-
40
-
3
MAX
5.2
50
100
5.25
10
0.8
-
20
-
UNIT
V
mV
mV
V
mA
mA
mV
mV
°C/W
(1) T
j
=
0° to 125°C ; I
OUT
= 0.5A ;I
MAX
= 0.2A and P
MAX
= 2W ; I
MAX
= 1A and P
MAX
= 20W
(2) Without a heat sink, the thermal resistance is approximately 35°C. With a heat sink, the effective thermal
resistance can only approach the values specified, depending on the efficiency of the sink.
COMSET SEMICONDUCTORS
1/2
COMSET [ COMSET SEMICONDUCTOR ]
