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National Semiconductor |
April 1998
LM109/LM309
5-Volt Regulator
General Description
The LM109 series are complete 5V regulators fabricated on
a single silicon chip. They are designed for local regulation
on digital logic cards, eliminating the distribution problems
association with single-point regulation. The devices are
available in two standard transistor packages. In the
solid-kovar TO-5 header, it can deliver output currents in ex-
cess of 200 mA, if adequate heat sinking is provided. With
the TO-3 power package, the available output current is
greater than 1A.
The regulators are essentially blowout 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 to minimize the number of external compo-
nents. It is not necessary to bypass the output, although this
does improve transient response somewhat. Input bypass-
ing 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.
Although designed primarily as a fixed-voltage regulator, the
output of the LM109 series can be set to voltages above 5V,
as shown. It is also possible to use the circuits as the control
element in precision regulators, taking advantage of the
good current-handling capability and the thermal overload
protection.
Features
n Specified to be compatible, worst case, with TTL and
DTL
n Output current in excess of 1A
n Internal thermal overload protection
n No external components required
Schematic Diagram
© 1999 National Semiconductor Corporation DS007138
DS007138-1
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Power Dissipation
35V
Internally Limited
Operating Junction Temperature Range
LM109
LM309
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec.)
−55˚C to +150˚C
0˚C to +125˚C
−65˚C to +150˚C
300˚C
Electrical Characteristics (Note 2)
Parameter
Output Voltage
Line Regulation
Load Regulation
TO-39 Package
TO-3 Package
Output Voltage
Quiescent Current
Quiescent Current Change
Output Noise Voltage
Long Term Stability
Ripple Rejection
Thermal Resistance,
Junction to Case
TO-39 Package
TO-3 Package
Conditions
Tj = 25˚C
Tj = 25˚C
7.10V ≤ VIN ≤ 25V
Tj = 25˚C
5 mA ≤ IOUT ≤ 0.5A
5 mA ≤ IOUT ≤ 1.5A
7.40V ≤ VIN ≤ 25V,
5 mA ≤ IOUT ≤ IMAX,
P < PMAX
7.40V ≤ VIN ≤ 25V
7.40V ≤ VIN ≤ 25V
5 mA ≤ IOUT ≤ IMAX
TA = 25˚C
10 Hz ≤ f ≤ 100 kHz
Tj = 25˚C
(Note 3)
LM109
Min Typ Max
4.7 5.05 5.3
4.0 50
LM309
Min Typ Max
4.8 5.05 5.2
4.0 50
Units
V
mV
15 50
15 50 mV
15 100
15 100 mV
4.6 5.4 4.75 5.25 V
5.2 10
0.5
0.8
40
10
50
50
5.2 10
0.5
0.8
40
20
mA
mA
mA
µV
mV
dB
15 15 ˚C/W
2.5 2.5 ˚C/W
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: Unless otherwise specified, these specifications apply −55˚C ≤ Tj ≤ +150˚C for the LM109 and 0˚C ≤ Tj ≤ +125˚C for the LM309; VIN = 10V; and IOUT = 0.1A
for the TO-39 package or IOUT = 0.5A for the TO-3 package. For the TO-39 package, IMAX = 0.2A and PMAX = 2.0W. For the TO-3 package, IMAX = 1.0A and PMAX
= 20W.
Note 3: Without a heat sink, the thermal resistance of the TO-39 package is about 150˚C/W, while that of the TO-3 package is approximately 35˚C/W. With a heat
sink, the effective thermal resistance can only approach the values specified, depending on the efficiency of the sink.
Note 4: Refer to RETS109H drawing for LM109H or RETS109K drawing for LM109K military specifications.
Connection Diagrams
Metal Can Packages
DS007138-33
Order Number LM109H, LM109H/883 or LM309H
See NS Package Number H03A
www.national.com
2
DS007138-34
Order Number LM109K STEEL or
LM309K STEEL
See NS Package Number K02A
Order Number LM109K/883
See NS Package Number K02C
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