LM-340 Datasheet | National Semiconductor

Description The LM140A LM140 LM340A LM340 LM7800C monolithic 3-terminal positive voltage regulators employ internal current-limiting thermal shutdown and safe-area pensation making them essentially indestructible If adequate heat sinking is provided they can deliver over 1 0A output current They are intended as fixed voltage regulators in a .. wide range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation In addition to use as fixed voltage regulators these devices can be used with external ponents to obtain adjustable output voltages and currents Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of external ponents It is not necessary to bypass the output although this does improve transient response Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply The 5V 12V and 15V regulator options are available in the steel TO-3 power package The LM340A LM340 LM7800C series is available in the TO-220 plastic power package and the LM7805 and LM7812 are also available in the surfacemount TO-263 package Features Y Y Y Y Y plete specifications at 1A load Output voltage tolerances of g 2% at Tj e 25 C and g 4% over the temperature range (LM140A LM340A) Line regulation of 0 01% of VOUT V of DVIN at 1A load (LM140A LM340A) Load regulation of 0 3% of VOUT A (LM140A LM340A) Internal thermal overload protection Internal short-circuit current limit Output transistor safe area protection P a Product Enhancement tested Device Output Voltages Packages TO-3 (K) TO-3 (K) TO-220 (T) TO-220 (T) TO-263 (S) (5V and 12V only) LM140A LM140 5 12 15 LM340A LM340 5 12 15 LM7800C 5 6 8 12 15 18 24 Typical Applications Fixed Output Regulator Adjustable Output Regulator Current Regulator TL H 7781- 1 TL H 7781 - 3 Required if the regulator is located far from the power supply filter...