|Category||Power Management => Regulators => Linear Regulators => Positive|
|Description||3-terminal Positive Regulators|
|Company||National Semiconductor Corporation|
|Datasheet||Download LM342 datasheet
The LM342-XX series of three-terminal regulators is available with several fixed output voltages making them useful in a wide range of applications One of these is local on card regulation eliminating the distribution problems associated with single point regulation The voltages available allow these regulators to be used in logic systems instrumentation HiFi and other solid state electronic equipment Although designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents The LM342-XX series is available in the plastic TO-202 package This package allows these regulators to deliver over 25A if adequate heat sinking is provided Current limiting is included to limit the peak output current to a safe value Safe area protection for the output transistor is provided to limit internal power dissipation If internal power dissipation becomes too high for the heat sinking provided the thermal shutdown circuit takes over preventing the IC from overheating Considerable effort was expended to make the LM342-XX series of regulators easy to use and minimize the number of external components 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 For output voltage other than 5V 12V and 15V the LM117 series provides an output voltage range from to 57VFeatures
Output current in excess 0 25A Internal thermal overload protection No external components required Output transistor safe area protection Internal short circuit current limit Available in plastic TO-202 package Special circuitry allows start-up even if output is pulled to negative voltage ( g supplies)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Input Voltage e 12V and 15V Internal Power Dissipation Operating Temperature Range 30V 35V Internally Limited 250 mA (Note 2) unless noted 12V 19V Min 15V 23V Typ Max V mV khrs mV dB Units Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering 10 sec ) ESD Susceptibility 125 C
Output Voltage Input Voltage (unless otherwise noted) Symbol VO Parameter Output Voltage (Note 250 mA and VMIN s VIN s VMAX 250 mA ConditionsLine Regulation Load Regulation Long Term Stability Quiescent Current Quiescent Current Change
Output Noise Voltage 10 Hz10 kHz Ripple Rejection Input Voltage Required to Maintain Line Regulation Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient 73 P Package P Package
Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is intended to be functional but do not guarantee specific performance limits For guaranteed specifications and test conditions see the Electrical Characteristics Note 2 The electrical characteristics data represent pulse test conditions with junction temperatures as shown at the initiation of tests Note 3 The temperature coefficient of VOUT is typically within VO CMaximum Average Power Dissipation (TO-202 Package) Peak Output Current Dropout Voltage
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