NTE1956 Integrated Circuit Positive 3 Terminal Voltage Regulator, Low Dropout Voltage, 24V, 1A Description: The NTE1956 is a positive voltage regulator in a TO220 type package with a low input/output voltage. This device is suitable for lowvoltage, batterydriven equipment, and home appliances and industrial equipment with great fluctuation of the supply voltage. Features: Minimum Input/Output Voltage Difference: 0.5V Typ OnChip Overcurrent Limiter OnChip Thermal Protection Circuit OnChip Inrush Current Protection Circuit at the time of Input Voltage StartUp OnChip Input ShortCircuit Protection Circuit (When the Input Pin is ShortCircuited to the Ground, the Circuit Between Pin1 and Pin3 is Shut Down to Prevent Current Flow) Applications: Power Supply Equipment Absolute Maximum Ratings: (T = +25C unless otherwise specified) A Supply Voltage (Note 1), V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V IN Supply Current (Note 2), I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4A IN Power Dissipation (Note 3), P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15W D Operating Ambient Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to +85C opr Storage Junction Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to +150C stg Thermal Resistance, JunctiontoAmbient, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65C/W thJA Thermal Resistance, JunctiontoCase, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C/W thJC Note 1. At the application of V = 30V, the overvoltage protection may be operated by the ASO IN protection circuit, leading to the output shut down. Note 2. The current value does not exceed this criterion because of the onchip current limiter. Note 3. The internal circuit shuts off the output when T +150C (design value). J Recommended Operating Conditions: (I = 500mA, T = +25C unless otherwise specified) O A Parameter Symbol Test Conditions Min Typ Max Unit Operating Supply Voltage Range V 21.5 29.5 V INElectrical Characteristics: (V = 25.5V, I = 500mA, T = +25C unless otherwise specified) IN O A Parameter Symbol Test Conditions Min Typ Max Unit Output Voltage V T = +25C 23.28 24.0 24.72 V OUT J Line Regulation REG V = 25.5V to 29.5V, T = +25C 9.6 96 mV IN IN J Load Regulation REG V = 25.5V, I = 0 to 1200mA, 120 480 mV LOA IN O T = +25C J Input Dependency of Bias Current I V = 25.5V to 29.5V, T = +25C 1 10 mA Bias(IN) IN J Load Dependency of Bias Current I I = 0 to 1200mA, T = +25C 10 50 mA Bias(LOA) O J Bias Current at No Load I I = 0mA 2.6 5.0 mA Bias O Bias Current Before the I V = 21.6V, I = 0mA 3 5 mA rush IN O Regulation Starts Minimum I/O Voltage Difference V V = 21.6V, I = 500mA 0.4 0.6 V DIF(min) IN O T = +25C J I = 1200mA 0.5 1.0 V O Peak Output Current I V = 25.5V, T = +25C, Note 4 1.2 1.8 2.4 A O(Peak) IN J Ripple Rejection Ratio RR V = 25.5V to 27.5V, I = 100mA, 36 56 dB IN O f= 120Hz Design Reference Data (Note 5) Output ShortCircuit Current I V = 30V, T = +25C, Shorted Load 10 mA O(Short) IN J Thermal Protection Operating T V = 25.5V 150 C J(TH) IN Temperature Output Voltage Temperature a T = +25 to +125C 40 ppm/C J Coefficient Note 4. This current exceeds P max because it is a parameter during abnormal (overcurrent) operation. D Note 5. The characteristice listed are theoretical values based on the IC design and are not guaranteed. .420 (10.67) Max .110 (2.79) GND .147 .500 (3.75) (12.7) Dia Max Max .250 (6.35) Max .500 (12.7) Min .070 (1.78) Max V V IN OUT GND .100 (2.54)