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LM2990 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2990 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 12 page Electrical Characteristics (Continued) V IN = −5V+VO(NOM) (Note 6) , IO = 1A, CO = 47 µF, unless otherwise specified. Boldface limits apply over the entire operat- ing temperature range, −40˚C ≤ T J ≤ 125˚C, all other limits apply for TJ = 25˚C. LM2990-12 LM2990-15 Units (Limit) Parameter Conditions Typ Limit Typ Limit (Note 4) (Note 5) (Note 4) (Note 5) Short Circuit Current R L = 1Ω (Note 7) 1.2 0.9 1.0 0.75 A (min) Maximum Output Current (Note 7) 1.8 1.4 1.8 1.4 A (min) Ripple Rejection V ripple = 1Vrms, 52 42 52 42 dB (min) ƒ ripple = 1 kHz, IO = 5mA Output Noise Voltage 10 Hz–100 kHz, I O = 5 mA 500 1500 600 1800 µV (max) Long Term Stability 1000 Hours 2000 2000 ppm Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in- tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: Human body model, 100 pF discharged through a 1.5 k Ω resistor. Note 3: The maximum power dissipation is a function of TJmax, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJmax −TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 125˚C, and the LM2990 will eventually go into thermal shutdown at a TJ of approximately 160˚C. For the LM2990, the junction-to-ambient thermal resistance, is 53˚C/W, 73˚C/W for the TO-263, and the junction-to-case thermal resistance is 3˚C. If the TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package. Using 0.5 square inches of copper area, θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA is 32˚C/W. Note 4: Typicals are at TJ = 25˚C and represent the most likely parametric norm. Note 5: Limits are guaranteed and 100% production tested. Note 6: VO(NOM) is the nominal (typical) regulator output voltage, −5V, −5.2V, −12V or −15V. Note 7: The short circuit current is less than the maximum output current with the −12V and −15V versions due to internal foldback current limiting. The −5V and −5.2V versions, tested with a lower input voltage, does not reach the foldback current limit and therefore conducts a higher short circuit current level. If the LM2990 output is pulled above ground, the maximum allowed current sunk back into the LM2990 is 1.5A. Definition of Terms Dropout Voltage: The input-output voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100 mV from the nominal value obtained at (V O + 5V) input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminals with respect to ground. Input-Output Differential: The voltage difference between the unregulated input voltage and the regulated output volt- age for which the regulator will operate. Line Regulation: The change in output voltage for a change in the input voltage. The measurement is made under condi- tions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly af- fected. Load Regulation: The change in output voltage for a change in load current at constant chip temperature. Long Term Stability: Output voltage stability under accelle- rated life-test conditions after 1000 hours with maximum rated voltage and junction temperature. Output Noise Voltage: The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Quiescent Current: That part of the positive input current that does not contribute to the positive load current. The regulator ground lead current. Ripple Rejection: The ratio of the peak-to-peak input ripple voltage to the peak-to-peak output ripple voltage. Temperature Stability of V O: The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. www.national.com 4 |
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