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NTE1901 Integrated Circuit Negative Adjustable Voltage Regulator, -1.2V to -37V, 100mA
Description: The NTE1901 is an adjustable 3-terminal negative voltage regulator in a TO92 type package capable of supplying 100mA over a -12,V to -37V output range. It is exceptionally easy to use and both line and load regulation are better than standard fixed regulators. In addition to higher performance than fixed regulators, the NTE1901 offers full overload protection. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitor in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators. Besides replacing fixed regulators, the NTE1901 is useful in a wide variety of other applications. Since the regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the NTE1901 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. Features: D Adjustable Output Down to 1.2V D Guaranteed 100mA Output Current D Line Regulation Typically 0.01%/V D Load Regulation Typically 0.1% D Current Limit Constant with Temperature D Eliminates the Need to Stock Many Voltages D Standard 3-Lead Transistor Package D 80db Ripple Rejection D Output is Short Circuit Protected
Absolute Maximum Ratings: (TA = +25C unless otherwise specified) Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Input-Output Voltage Differential, VI - VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +125C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C Electrical Characteristics: (Note 1 unless otherwise specified)
Parameter Line Regulation Symbol RegLine Test Conditions TA = +25C, 3V (VIN - VO) 40V, Note 2 3V (VIN - VO) 40V, Note 2 Load Regulation RegLoad TA = +25C, 5mA IO 100mA, Note 2 5mA IO 100mA, Note 2 Thermal Regulation Adjustment Pin Current Adjustment Pin Current Change Reference Voltage Temperature Stability Minimum Load Currnt IAdj IAdj Vref TS IL(min) Imax N RR 5mA IL 100mA, 3V (VIN - VO) 40V 5mA IL 100mA, 3V (VIN - VO) 40V, P 625mW, Note 3 -25C TJ +125C (VIN - VO) 40V 3V (VIN - VO) 15V MaximumOutput Current Limit 3V (VIN - VO) 13V (VIN - VO) 40V RMS Output Noise, % of VOUT Ripple Rejection Ratio TA = +25C, 10Hz f +10kHz VOUT = -10V, f = 120Hz, CADJ = 0 CADJ = 10F Long Term Stability S TJ = +125C, 100 Hours TA = +25C, 10ms Pulse Min - - - - - - - 1.20 - - - 100 25 - - 66 - Typ 0.01 0.02 0.1 0.1 0.04 50 0.2 1.25 0.65 3.5 2.2 200 50 0.003 65 80 0.3 Max 0.04 0.07 0.5 0.5 0.2 100 5.0 1.30 - 5.0 3.5 300 150 - - - 1.0 Unit %/V %/V % % %/W A A V % mA mA mA mA % dB dB %
Note 1. Unless otherwise noted, these specifications apply: -25 TJ +125C, VIN - VOUT = 5V, IOUT = 40mA, and IMAX = 100mA. Although power dissipation is internally limited, these specifications are applicable for power dissipations up to 625mW. Note 2. Regulation is measured at constant junction temperature, using pulse testing with low duty cycle. Changes in output voltage due to heating effects are covered under the specifications for thermal regulation. Note 3. Thermal resistance o the TO92 package is 180C/W junction to ambient with 0.4" leads from a PC board and 160C/W junction to ambient with 0.125" lead length to PC board.
.135 (3.45) Min
.210 (5.33) Max
Seating Plane
.500 (12.7) Min
.021 (.445) Dia Max
Adjust VOUT
VIN
.100 (2.54) .050 (1.27)
.105 (2.67) Max .205 (5.2) Max
.165 (4.2) Max .105 (2.67) Max

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