RoHS Compliance Information	Size in Kbytes	Date
LM109/LM309 5-Volt Regulator	252 Kbytes	3-Mar-99	Download

Part Number

Package

Factory Lead Time

Models

Samples & Electronic Orders

Budgetary Pricing

Std Pack Size

Package Marking Format

Type

Pins

Spec.

MSL Rating

Peak Reflow

RoHS Report

CAD Symbols

Weeks

Qty

Qty

$US each

LM309H

TO-39

3

NOPB STD

1 1

NA NA

RoHS

N/A

Full production

N/A

1K+

$5.31

box of 500

NSZXYTTE# LM309HP+

6 weeks

1000

LM309K STEEL

TO-3

2

NOPB STD

1 1

NA NA

RoHS

N/A

Full production

N/A

1K+

$21.90

tray of 50

NS ZXYTTE# LM309K STEELP+

6 weeks

500

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.

Application Notes

Title	Size in Kbytes	Date
AN-181: Application Note 181 3-Terminal Regulator Is Adjustable	165 Kbytes	1-May-04	Download

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