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LM78LXX Series3-Terminal PosiTIve RegulatorsGeneral DescripTIonThe LM78LXX series of three terminal posiTIve regulators isavailable with several fixed output voltages making themuseful in a wide range of applicaTIons. When used as a zenerdiode/resistor combination replacement, the LM78LXX usuallyresults in an effective output impedance improvement oftwo orders of magnitude, and lower quiescent current. Theseregulators can provide local on card regulation, eliminatingthe distribution problems associated with single point regulation.The voltages available allow the LM78LXX to be used inlogic systems, instrumentation, HiFi, and other solid stateelectronic equipment.The LM78LXX is available in the plastic TO-92 (Z) package,the plastic SO-8 (M) package and a chip sized package(8-Bump micro SMD) using National’s micro SMD packagetechnology. With adequate heat sinking the regulator can deliver100 mA output current. Current limiting is included tolimit the peak output current to a safe value. Safe area protectionfor the output transistors is provided to limit internalpower dissipation. If internal power dissipation becomes toohigh for the heat sinking provided, the thermal shutdown circuittakes over preventing the IC from overheating.Featuresn LM78L05 in micro SMD packagen Output voltage tolerances of ±5% over the temperaturerangen Output current of 100 mAn Internal thermal overload protectionn Output transistor safe area protectionn Internal short circuit current limitn Available in plastic TO-92 and plastic SO-8 low profilepackagesn No external componentsn Output voltages of 5.0V, 6.2V, 8.2V, 9.0V, 12V, 15V
