LM109,LM309 LM109/LM309 5-Volt Regulator Literature Number: SNVS752A
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 excess of 200 mA, if adequate heat sinking is provided.
LM109/LM309 Absolute Maximum Ratings (Note 1) Operating Junction Temperature Range LM109 LM309 Storage Temperature Range Lead Temperature (Soldering, 10 sec.) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
1. Bypass the input of the LM109 to ground with ≥ 0.2 µF ceramic or solid tantalum capacitor if main filter capacitor is more than 4 inches away. 2. Avoid insertion of regulator into “live” socket if input voltage is greater than 10V. The output will rise to within 2V of the unregulated input if the ground pin does not make contact, possibly damaging the load.
LM109/LM309 Typical Performance Characteristics Maximum Average Power Dissipation (LM109H) (Continued) Maximum Average Power Dissipation (LM309H) Ripple Rejection DS007138-21 DS007138-19 Current Limit Characteristics (Note 5) DS007138-20 Thermally Induced Output Voltage Variation Ripple Rejection DS007138-24 DS007138-22 DS007138-23 Note 5: Current limiting foldback characteristics are determined by input output differential, not by output voltage.
Quiescent Current (Continued) Quiescent Current DS007138-28 Line Transient Response LM109/LM309 Typical Performance Characteristics Output Voltage Noise DS007138-29 DS007138-30 Load Transient Response DS007138-31 DS007138-32 Typical Applications Fixed 5V Regulator Adjustable Output Regulator DS007138-4 DS007138-2 *Required if regulator is located more than 4" from power supply filter capacitor. †Although no output capacitor is needed for stability, it does improve transient response.
LM109/LM309 Typical Applications (Continued) High Stability Regulator* DS007138-5 *Regulation better than 0.01%, load, line and temperature, can be obtained. †Determines zener current. May be adjusted to minimize thermal drift. ‡ Solid tantalum. Current Regulator DS007138-6 *Determines output current. If wirewound resistor is used, bypass with 0.1 µF. www.national.
LM109/LM309 Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package (H) Order Number LM109H, LM109H/883 or LM309H NS Package Number H03A Metal Can Package (K) Order Number LM109K STEEL, LM309K STEEL NS Package Number K02A 7 www.national.
LM109/LM309 5-Volt Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Metal Can Package (K) Mil-Aero Product Order Number LM109K/883 NS Package Number K02C LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1.
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