NTE957

NTE957 Integrated Circuit 3–Terminal Adjustable Negative Voltage Regulator Description: The NTE957 is an adjustable 3–terminal negative voltage regulator in a TO220 type package capable of supplying in excess of –1.5A over a –1.2V to –37V output range. The circuit design has been optimized for excellent regulation and low thermal transients. Further, the NTE957 features internal current limiting, thermal shutdown, and safe–area compensation, making this device virtually blowout–proof against overloads. The NTE957 serves a wide variety of applications including local on–card regulation, programmable– output voltage regulation or precision current regulation. The NTE957 is the ideal complement to the NTE956 adjustable positive regulator. Features: D Output Voltage Adjustable from –1.2V to –37V D Guaranteed 1.5A Output Current D Line Regulation Typically 0.01%/V D Load Regulation Typically 0.3% D Excellent Thermal Regulation: 0.002%/W D 77dB Ripple Rejection D Temperature–Independent Current Limit D Internal Thermal Overload Protection D 100% Electrical Burn–In D Eliminates the Need to Stock Many Voltages Absolute Maximum Ratings: Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Input–Output Voltage Differential, VI–VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +125°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Typical Thermal Resistance, Junction–to–Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4°C/W Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Electrical Characteristics: (0° ≤ TJ ≤ +125°C, VIN–VOUT = 5V, IO = 500mA, IMAX = 1.5A, Note 1 unless otherwise specified) Parameter Line Regulation Load Regulation Symbol Regline Regload Test Conditions Min Typ Max Unit 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, 10mA ≤ IO ≤ IMAX, VOUT ≤ 5V Note 2 VOUT ≥ 5V – 15 50 mV – 0.3 1.0 % VOUT ≤ 5V – 20 70 mV VOUT ≥ 5V – 0.3 1.5 % – 0.003 0.04 %/W – 65 100 µA – 2 5 µA 10mA ≤ IO ≤ 1MAX, Note 2 Thermal Regulation TA = +25°C, 20ms Pulse Adjustment Pin Current IAdj Adjustment Pin Current Change ∆IAdj 10mA ≤ IL ≤ IMAX, 2.5V ≤ (VIN–VOUT) ≤ 40V, TA = +25°C Reference Voltage Vref TA = +25°C –1.213 –1.250 –1.287 V 3V ≤ (VIN–VOUT) ≤ 40V, 10mA ≤ IO ≤ 1MAX, P ≤ PMAX –1.200 –1.250 –1.300 V Temperature Stability Minimum Load Current Maximum Output Current Limit RMS Output Noise, % of VOUT Ripple Rejection Ratio TS 0° ≤ TJ ≤ +125°C – 0.6 – % ILmin (VIN–VOUT) ≤ 40V – 2.5 10 mA (VIN–VOUT) ≤ 10V – 1.5 6.0 mA VIN–VOUT ≤ 15V 1.5 2.2 – A VIN–VOUT = 40V – 0.4 – A TA = +25°C, 10Hz ≤ f ≤ 10kHz – 0.003 – % VOUT = 10V, f = 120Hz – 60 – dB 66 77 – dB – 0.3 1.0 % Imax N RR CADJ = 10µF Long Term Stability S TA = +125°C, 1000 Hours Note 1. Although power dissipation is internally limited, these specifications are applicable for power dissipations of 20W. 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. .420 (10.67) Max .110 (2.79) .500 (12.7) Max .147 (3.75) Dia Max .250 (6.35) Max .500 (12.7) Min .070 (1.78) Max Adj .100 (2.54) VOUT VIN/Tab