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LP2950 Datasheet(PDF) 3 Page - Advanced Monolithic Systems |
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LP2950 Datasheet(HTML) 3 Page - Advanced Monolithic Systems |
3 / 14 page Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 LP2950/LP2951 ELECTRICAL CHARACTERISTICS (Note 2) (Continued) PARAMETER CONDITIONS (Note 2) LP2950AC LP2951AC Min. Typ. Max. LP2950C LP2951C Min. Typ. Max. Units Output Noise, 10Hz to 100KHz CL = 1µF CL = 200 µF CL = 13.3 µF (Bypass = 0.01 µF pins 7 to 1(LP2951)) 430 160 100 430 160 100 µV rms µV rms µV rms 8-Pin Versions only LP2951AC LP2951C Reference Voltage 1.22 1.235 1.25 1.21 1.235 1.26 V Reference Voltage Over Temperature (Note 7) 1.19 1.27 1.185 1.285 V Feedback Pin Bias Current 40 60 40 60 nA Reference Voltage Temperature Coefficient ( Note 12 ) 20 50 ppm/°C Feedback Pin Bias Current Temperature Coefficient 0.1 0.1 nA/°C Error Comparator Output Leakage Current V OH = 30V 0.01 1 0.01 1 µA Output Low Voltage Vin = 4.5V IOL = 400µA 150 250 150 250 mV Upper Threshold Voltage (Note 6) 40 60 40 60 mV Lower Threshold Voltage (Note 6) 75 95 75 95 mV Hysteresis (Note 6) 15 15 mV Shutdown Input Input logic Voltage Low (Regulator ON) High (Regulator OFF) 2 1.3 0.7 2 1.3 0.7 V V Shutdown Pin Input Current (Note 3) Vs = 2.4V Vs = 30V 30 450 50 600 30 450 50 600 µA µA Regulator Output Current in Shutdown (Note 3) (Note 11) 3 10 3 10 µA Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: Unless otherwise specified all limits guaranteed for VIN = ( VONOM +1)V, IL = 100 µA and C L = 1 µF for 5V versions and 2.2µF for 3V and 3.3V versions. Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25 °C Additional conditions for the 8-pin versions are FEEDBACK tied to VTAP, OUTPUT tied to SENSE and VSHUTDOWN ≤ 0.8V. Note 3: Guaranteed and 100% production tested. Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels. Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 6: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at VIN = ( VONOM +1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/Vref = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of Vout as Vout is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 7: Vref ≤V out ≤ (V in - 1V), 2.3 ≤V in ≤30V, 100µA≤I L ≤ 100 mA, T J ≤ T JMAX. Note 8: The junction-to-ambient thermal resistance are as follows:180 °C/W and 160°C/W for the TO-92 (N) package with 0.40 inch and 0.25 inch leads to the printed circuit board (PCB) respectively, 105 °C/W for the molded plastic DIP (P) and 160°C/W for the molded plastic SO-8 (S). The above thermal resistances for the N, S and P packages apply when the package is soldered directly to the PCB. Note 9: May exceed input supply voltage. Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to ground. Note 11: Vshutdown ≥ 2V, V in ≤ 30V, V out =0, Feedback pin tied to 5VTAP. Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. |
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