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NTE953
Linear Integrated Circuit 4-Terminal Positive Adjustable Voltage Regulator
Description: The NTE953 4-Terminal adjustable voltage regulator is designed to deliver continuous load currents of up to 1.0A with a maximum input voltage of +40V. Output current capability can be increased to greater than 1.0A through the use of one or more external transistors. The output voltage range is 5V to 30V. For systems requiring both a positive and negative, the NTE953 and NTE954 are excellent for use as a dual tracking regulator with appropriate external circuitry. Features: D Output Current in Excess of 1A D Positive Output 5V to 30V D Internal Thermal Overload Protection D Internal Short Circuit Protection D Output Transistor Safe-Area Protection D Power Watt Package Absolute Maximum Ratings: Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Control Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V VOUT Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to 150C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55C to +150C Lead Temperature (During soldering, 10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +230C
Electrical Characteristics:
Parameter Input Voltage Range Output Voltage Range Output Voltage Tolerance
(-0C TJ 125C, VIN = 10V, IOUT = 500mA, CIN = 0.33F, COUT = 0.1F, unless otherwise specified.)
Test Conditions (Note 1, Note 3) TJ = 25C VIN = VOUT +5V VOUT +3V VIN VOUT +15V, TJ = 25C 5mA IOUT 1.0A, PD 15W, VIN (max) = 38V TJ = 25C, VOUT 10V, (VOUT 2.5V) VIN (VOUT +20V) TJ = 25C, VOUT 10V, (VOUT +3V) VIN (VOUT +15V) (VOUT +3V) VIN (VOUT +7V) Min 7.5 5.0 - - - - - - - - - Typ - - - - - - - - - 1.0 - 3.2 - 78 8 - 0.75 2.2 - - 5.0 - Max 40 30 4.0 5.0 1.0 %(VOUT) 0.75 0.67 1.0 2.0 5.0 8.0 5.0 6.0 - 40 2.5 1.2 3.3 0.4 0.3 5.2 5.25 %(VOUT) %(VOUT) A A A A dB V/VOUT V A A mV/C/ VOUT V V Unit V V %(VOUT) %(VOUT) %(VOUT)
Line Regulation
Load Regulation
250mA IOUT 750mA TJ = 25C, 25 C, VIN = VOUT +5V 5mA IOUT 1.5A TJ = 25C
Control Pin Current
Quiescent Current
TJ = 25C 8V VIN 18V, VOUT = 5V, f = 120Hz TJ = 25C, 10Hz f 100kHz, VOUT = 5V, IOUT = 5mA Note 2 TJ = 25C, VIN = 30V TJ = 25C VOUT = 5V, IOUT = 5mA TJ = 25C TJ = -55C to +25C TJ = +25C to +150C
- -
Ripple Rejection Output Noise Voltage Dropout Voltage Short Circuit Current Peak Output Current Average Temperature Coefficient of Output Voltage Control Pin Voltage (Reference)
62 - - - 1.3 - - 4.8 4.75
Note 1. VOUT is defined as: V OUT =
R1 + R2 R2
(5.0)
Note 2. Dropout Voltage is defined as that input-output voltage differential which causes the output voltage to decrease by 5% of its initial value. Note 3. All characteristics except noise voltage and ripple rejection ratio are measured using pulse techniques (tW 10ms, duty cycle 5%). Output voltage changes due to changes in internal temperature must be taken into account separately.
Design Considerations: The NTE953 adjustable voltage regulator has an output voltage which varies from VCONTROL to typically (R1 + R2) VIN -2V by VOUT = VCONTROL R2 The nominal reference in the NTE953 is 5.0V. If we allow 1.0mA to flow in the control string to eliminate bias current effects, we can make R2 = 2.2k. The output voltage is then: VOUT = (R1 + R2)V, where R1 and R2 are in ks. Example: If R2 = 5k and R1 = 10k then VOUT = 15V nominal
By proper wiring of the feedback resistors, load regulation of the device can be improved significantly. The NTE953 voltage regulator contains thermal-overload protection from excessive power, internal short-circuit protection which limits each circuit's maximum current, and output transistor safe-area protection for reducing the output current as the voltage across each pass transistor is increased. Although the internal power dissipation is limited, the junction temperature must be kept below the maximum specified temperature in order to meet data sheet specifications. To calculate the maximum junction temperature or heat sink required, the following thermal resistance values should be used: Typ C/W JC 7.5 Max C/W JC 11 TJ(max) - TA Typ C/W JA 75 Max C/W JA 80 TJ(max) - TA
PD(max) =
JC + CA JA (Without a heat sink)
or
CA = CS + SA Solving for TJ: TJ = TA + PD (JC + CA) or TA + PD JA (Without heat sink) = = = = = = = = Junction Temperature Ambient Temperature Power Dissipation Junction to Ambient Thermal Resistance Junction to Case Thermal Resistance Case to Ambient Thermal Resistance Case to Heat Sink Resistance Heat Sink to Ambient Thermal Resistance
Where:
TJ TA PD JA JC CA CS SA
.375 (9.52) .360 (9.14) .110 (2.79) .125 (3.17) Dia .135 (3.45)
Tab .310 (7.87)
Indicating Mark #1 Pin
1
2
3
4
.955 (24.27)
.250 (6.35)
.395 (10.05) .270 (6.85)
.100 (2.54)
Pin 1. 2. 3. 4. Tab
GND VIN VOUT Adjust GND

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