NTE1900 Integrated Circuit 3–Terminal Adjustable Positive Voltage Regulator Description: The NTE1900 is an adjustable 3–terminal positive voltage regulator in a TO92 type package capable of supplying in excess of 100mA over a 1.2V to 37V output range. This device 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 NTE1900 offers full overload protection available only in IC’s. 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 far from the input filter capacitors 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 NTE1900 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 NTE1900 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to GND 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 80dB Ripple Rejection Absolute Maximum Ratings: 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Electrical Characteristics: (–25° ≤ TJ ≤ +125°C, VIN–VOUT = 5V, IO = 40mA, IMAX = 100mA, Note 1 unless otherwise specified) Parameter Line Regulation Load Regulation Symbol Test Conditions Min Typ Max Unit Regline TA = +25°C, 3V ≤ (VIN–VOUT) ≤ 40V, Note 2 – 0.01 0.04 %/V 3V ≤ (VIN–VOUT) ≤ 40V – 0.02 0.07 %/V TA = +25°C, 5mA ≤ IO ≤ 1MAX, Note 2 – 0.1 0.5 % 5mA ≤ IO ≤ 100mA, Note 2 – 0.3 1.5 % TA = +25°C, 10ms Pulse – 0.04 0.2 %/W – 50 100 µA Regload Thermal Regulation Adjustment Pin Current IAdj Adjustment Pin Current Change ∆IAdj 5mA ≤ IL ≤ 100mA, 3V ≤ (VIN–VOUT) ≤ 40V, P ≤ 625mW – 0.2 5.0 µA Reference Voltage Vref 3V ≤ (VIN–VOUT) ≤ 40V, 5mA ≤ IO ≤ 100mA, P ≤ 625mW, Note 3 1.20 1.25 1.30 V Temperature Stability TS –25° ≤ TJ ≤ +125°C – 0.65 – % (VIN–VOUT) ≤ 40V – 3.5 5 mA 3V ≤ (VIN–VOUT) ≤ 15V – 1.5 2.5 mA 3V ≤ (VIN–VOUT) ≤ 13V 100 200 300 mA VIN–VOUT = 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, 1000 Hours – 0.3 1.0 % Minimum Load Current Maximum Output Current Limit RMS Output Noise, % of VOUT Ripple Rejection Ratio Long Term Stability ILmin Imax N RR S Note 1. Although power dissipation is internally limited, these specifications are applicable for power dissipations of 625mW. Note 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 3. Thermal resistance 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 Adj VIN VOUT .100 (2.54) .050 (1.27) .165 (4.2) Max .105 (2.67) Max .205 (5.2) Max .105 (2.67) Max