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 = +25°C unless otherwise specified) Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Input–Output Voltage Differential, VI – VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Electrical Characteristics: (Note 1 unless otherwise specified) Parameter Line Regulation Load Regulation Symbol Test Conditions Min Typ Max Unit RegLine TA = +25°C, 3V ≤ (VIN – VO) ≤ 40V, Note 2 – 0.01 0.04 %/V 3V ≤ (VIN – VO) ≤ 40V, Note 2 – 0.02 0.07 %/V RegLoad TA = +25°C, 5mA ≤ IO ≤ 100mA, Note 2 – 0.1 0.5 % 5mA ≤ IO ≤ 100mA, Note 2 – 0.1 0.5 % TA = +25°C, 10ms Pulse – 0.04 0.2 %/W – 50 100 µA Thermal Regulation Adjustment Pin Current IAdj Adjustment Pin Current Change IAdj 5mA ≤ IL ≤ 100mA, 3V ≤ (VIN – VO) ≤ 40V – 0.2 5.0 µA Reference Voltage Vref 5mA ≤ IL ≤ 100mA, 3V ≤ (VIN – VO) ≤ 40V, P ≤ 625mW, Note 3 1.20 1.25 1.30 V Temperature Stability TS –25°C ≤ TJ ≤ +125°C – 0.65 – % Minimum Load Currnt IL(min) (VIN – VO) ≤ 40V – 3.5 5.0 mA 3V ≤ (VIN – VO) ≤ 15V – 2.2 3.5 mA 3V ≤ (VIN – VO) ≤ 13V 100 200 300 mA (VIN – VO) ≤ 40V 25 50 150 mA TA = +25°C, 10Hz ≤ f ≤ +10kHz – 0.003 – % VOUT = –10V, f = 120Hz, CADJ = 0 – 65 – dB CADJ = 10µF 66 80 – dB TJ = +125°C, 100 Hours – 0.3 1.0 % MaximumOutput Current Limit RMS Output Noise, % of VOUT Ripple Rejection Ratio Long Term Stability Imax N RR S Note 1. Unless otherwise noted, these specifications apply: –25° ≤ TJ ≤ +125°C, 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 180°C/W junction to ambient with 0.4” leads from a PC board and 160°C/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 VIN VOUT .100 (2.54) .050 (1.27) .105 (2.67) Max .205 (5.2) Max .165 (4.2) Max .105 (2.67) Max