NTE958 Integrated Circuit 3Terminal Positive Voltage Regulator, 18V The NTE958 fixedvoltage regulator is a monolithic integrated circuit in a TO220 type package de- signed for use in a wide variety of applications including local, oncard regulation. This regulator em- ploys internal current limiting, thermal shutdown, and safearea compensation. With adequate heat- sinking it can deliver output currents in excess of 1.0 ampere. Although designed primarily as a fixed voltage regulator, this device can be used with external components to obtain adjustable voltages and currents. Features: Output Current in Excess of 1.0 Ampere No External Components Reguired Internal Thermal Overload Protection Internal ShortCircuit Current Limiting Output Transistor SafeArea Compensation Absolute Maximum Ratings: (T = +25C unless otherwise specified) A Input Voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Vdc in Power Dissipation (T = +25C), P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited A D Derate above +25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4mW/C Power Dissipation (T = +25C), P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited C D Derate above +75C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mW/C Thermal Resistance, JunctiontoAmbient, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65C/W thJA Thermal Resistance, JunctiontoCase, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C/W thJC Operating Junction Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to +150C J Storage Junction Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to +150C stg Electrical Characteristics: (V = 27V, I = 500mA, T = 0 to +125C unless otherwise specified) in O J Parameter Symbol Test Conditions Min Typ Max Unit Output Voltage V T = +25C 17.3 18.0 18.7 V O J 5mA I 1A, P 15W, 21V V 33V 17.1 18.0 18.9 V O O in Line Regulation Reg T = +25C, Note 1 21V V 33V 25 360 mV line J in 24V V 30V 10 180 mV in Load Regulation Reg T = +25C, Note 1 5mA I 1.5A 55 360 mV load J O 250mA I 750mA 22 180 mV O Note 1. Load and line regulation are specified at constant junction temperature. Changes in V due O to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.Electrical Characteristics (Contd): (V = 27V, I = 500mA, T = 0 to +125C unless otherwise in O J specified) Parameter Symbol Test Conditions Min Typ Max Unit Quiescent Current I T = +25C 4.5 8.0 mA B J Quiescent Current Change I 21V V 33V 1.0 mA B in 5mA I 1A 0.5 mA O Ripple Rejection RR 22V V 32V, f = 120Hz 57 dB in Dropout Voltage V V T = +25C, I = 1A 2 V in O J O Output Noise Voltage V T = +25C, 10Hz f 100kHz 10 V/V n A O Output Resistance r f = 1kHz 19 m O ShortCircuit Current Limit I T = +25C, V = 35V 0.2 A sc A in Peak Output Current I T = +25C 2.2 A max J Average Temperature Coefficient TCV 1.1 mV/C O of Output Voltage .420 (10.67) Max .110 (2.79) GND .147 (3.75) .500 Dia Max (12.7) Max .250 (6.35) Max .500 (12.7) Min .070 (1.78) Max V V IN OUT .100 (2.54) GND