5-Volt Regulator

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 excess 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 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
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.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM309H/NOPB Texas Instruments 3A 5V Output Linear Regulator / LDO in hermetic packages 3-TO 0 to 125
LM309H Texas Instruments 3A 5V Output Linear Regulator / LDO in hermetic packages 3-TO 0 to 125
LM309K STEEL Texas Instruments 3A 5V Output Linear Regulator / LDO in hermetic packages 2-TO-3 0 to 125
LM309K STEEL/NOPB Texas Instruments 3A 5V Output Linear Regulator / LDO in hermetic packages 2-TO-3 0 to 125
LM309 's PackagesLM309 's pdf datasheet
LM309H TO-39
LM309K-STEEL TO-3




LM309 Pinout, Pinouts
LM309 pinout,Pin out
This is one package pinout of LM309,If you need more pinouts please download LM309's pdf datasheet.

LM309 Application circuits
LM309 circuits
This is one application circuit of LM309,If you need more circuits,please download LM309's pdf datasheet.


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