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See Technical Specifications

LM309K STEEL +BOM

1.5A Fixed 5.05V Positive electrode 25V TO-3-2 Linear Voltage Regulators (LDO) ROHS

Manufacturer:

Texas Instruments
Mfr.Part #:

LM309K STEEL
Datasheet:

LM309K STEEL Datasheet (PDF)
Output Options:

Fixed Output
Iout (max) (A):

1
Vin (max) (V):

35
Vin (min) (V):

7.1
EDA/CAD Models:

Request Free CAD Models for LM309K STEEL

LM309K STEEL Information

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 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.

Key Features

Specified to be compatible, worst case, with TTL and DTL
Output current in excess of 1A
Internal thermal overload protection
No external components required

Specifications

Output options	Fixed Output	Iout (max) (A)	1
Vin (max) (V)	35	Vin (min) (V)	7.1
Vout (max) (V)	5	Vout (min) (V)	5
Fixed output options (V)	5	Noise (µVrms)	40
Iq (typ) (mA)	5.2	Thermal resistance θJA (°C/W)	35
Rating	Military	Load capacitance (min) (µF)	0
Regulated outputs (#)	1	Accuracy (%)	5
PSRR at 100 KHz (dB)	64	Dropout voltage (Vdo) (typ) (mV)	1950
Operating temperature range (°C)	0 to 125	Package/Case	TO-2