LM342 Series 3-Terminal Positive Regulators General Description 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 0.25A 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 1.2V to 57V. Features Y Y Y Y Y Y Y Output current in excess of 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) Voltage Range LM342-5.0 LM342-12 LM342-15 5V 12V 15V Schematic Diagram TL/H/10485 – 1 C1995 National Semiconductor Corporation TL/H/10485 RRD-B30M115/Printed in U. S. A. LM342 Series 3-Terminal Positive Regulators June 1989 Absolute Maximum Ratings (Note 1) Input Voltage VO e 5V VO e 12V and 15V b 65§ C to a 150§ C Lead Temperature (Soldering, 10 sec.) 300§ C TBD ESD Susceptibility 30V 35V Internally Limited 0§ C to a 70§ C Internal Power Dissipation Operating Temperature Range 125§ C Maximum Junction Temperature Storage Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Electrical Characteristics TA e 0§ C to a 70§ C, IO e 250 mA (Note 2) unless noted Symbol VO Output Voltage 5V 12V 15V Input Voltage (unless otherwise noted) 10V 19V 23V Parameter Output Voltage (Note 3) Conditions Units Min Typ Max Min Typ Min Min TJ e 25§ C 4.8 14.4 15.6 V 1 mA s IO s 250 mA and VMIN s VIN s VMAX 4.75 5.25 11.4 12.6 14.25 15.75 (7.5sVINs20) (14.8sVINs27) (18sVINs30) V DVO Line Regulation TJ e 25§ C, IO e 250 mA DVO Load Regulation TJ e 25§ C, 1 mA s IO s 250 mA DVO Long Term Stability IQ Quiescent Current TJ e 25§ C DIQ Quiescent Current Change TJ e 25§ C, 1 mA s IO s 250 mA 5 5.2 55 (7.3sVINs25) 11.5 Vn Output Noise Voltage TJ e 25§ C, f e 10 Hz–10 kHz DVIN DVOUT Ripple Rejection f e 120 Hz Input Voltage Required to Maintain Line Regulation TJ e 25§ C, IO e 250 mA Thermal Resistance Junction to Case P Package Thermal Resistance Junction to Ambient P Package 12.5 100 (14.6sVINs30) 50 Typ Max 15 100 (17.7sVINs30) 120 20 TJ e 25§ C, VMIN s VIN s VMAX 12 150 48 60 mV mV mV/khrs 6 6 6 mA 0.5 0.5 0.5 mA 1.5 (7.3sVINs25) 1.5 (14.6sVINs30) 1.5 (17.7sVINs30) mA 40 96 120 mV 56 dB 50 64 7.3 44 56 14.6 42 17.7 V 15 15 15 § C/W 80 80 80 § C/W 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 0.01% VO/§ C. 2 Typical Performance Characteristics Maximum Average Power Dissipation (TO-202 Package) Peak Output Current Dropout Voltage Ripple Rejection Ripple Rejection Output Impedance Quiescent Current Quiescent Current TL/H/10485 – 3 3 Connection Diagram Typical Applications TO-202 (P) Plastic Package Fixed Output Regulator TL/H/10485 – 4 *Required if the regulator is located far from power supply filter **Although not required, C2 does improve transient response. (If needed, use 0.1 mF ceramic disc.) Adjustable Output Regulator TL/H/10485–2 Order Number LM342P-5.0, LM342P-12 or LM342P-15 See NS Package Number P03A TL/H/10485 – 5 VO e 5V a (5V/R1 a IQ) R2 5V/R1 l 3IQ, Load Regulation (LR) e [(R1 a R2)/R1] c (Lr of LM342-05) Current Regulator TL/H/10485 – 6 IOUT e V2b3/R1 a IQ DIQ s 1.5 mA over line and load changes 4 Typical Applications (Continued) High Output Voltage Regulator TL/H/10485 – 7 *Necessary if regulator is located far from the power supply filter **D3 aids in full load start-up and protects the regulator during short circuits from high input to output voltage differentials g 15V, 250 mA Dual Power Supply TL/H/10485 – 8 Variable Output Regulator 0.5V – 18V VOUT e VG a 5V, R1 e ( b VIN/IQ LM342) VOUT e 5V(R2/R4) for (R2 a R3) e (R4 a R5) A 0.5V output will correspond to (R2/R4) e 0.1, (R3/R4) e 0.9 TL/H/10485 – 9 *Solid tantalum 5 LM342 Series 3-Terminal Positive Regulators Physical Dimensions inches (millimeters) TO-202 Plastic Package (P) Order Numbers LM342P-5.0, LM342P-12 or LM342P-15 NS Package Number P03A 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 OF NATIONAL SEMICONDUCTOR CORPORATION. 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