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LP2951CSD-3.3 Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LP2951CSD-3.3 Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 26 page Electrical Characteristics (Note 2) (Continued) Parameter Conditions (Note 2) LP2951 LP2950AC-XX LP2950C-XX Units LP2951AC-XX LP2951C-XX Tested Tested Design Tested Design Typ Limit Typ Limit Limit Typ Limit Limit (Notes 3, 16) (Note 3) (Note 4) (Note 3) (Note 4) All Voltage Options Temperature Coefficient Feedback Pin Bias 0.1 0.1 0.1 nA/˚C Current Temperature Coefficient Error Comparator Output Leakage V OH = 30V 0.01 1 0.01 1 0.01 1 µA max Current 22 2 µA max Output Low V in =(VONOM − 0.5)V 150 250 150 250 150 250 mV max Voltage I OL = 400µA 400 400 400 mV max Upper Threshold (Note 6) 60 40 60 40 60 40 mV min Voltage 25 25 25 mV min Lower Threshold (Note 6) 75 95 75 95 75 95 mV max Voltage 140 140 140 mV max Hysteresis (Note 6) 15 15 15 mV Shutdown Input Input 1.3 1.3 1.3 V Logic Low (Regulator ON) 0.6 0.7 0.7 V max Voltage High (Regulator OFF) 2.0 2.0 2.0 V min Shutdown Pin Input Current V shutdown = 2.4V 30 50 30 50 30 50 µA max 100 100 100 µA max V shutdown = 30V 450 600 450 600 450 600 µA max 750 750 750 µA max Regulator Output Current in Shutdown (Note 11) 3 10 3 10 3 10 µA max 20 20 20 µA max 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 = 100µA and CL = 1µF 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 95mV x 5V/1.235V = 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 ≤ Vout ≤ (Vin − 1V), 2.3V ≤ Vin ≤ 30V, 100µA ≤ IL ≤ 100mA, TJ ≤ TJMAX. Note 8: The junction-to-ambient thermal resistances are as follows: 180˚C/W and 160˚C/W for the TO-92 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 (N), 130˚C/W for the ceramic DIP (J), 160˚C/W for the molded plastic SOP (M), 200˚C/W for the molded plastic MSOP (MM), and 160˚C/W for the metal can package (H). The above thermal resistances for the N, J, M, and MM packages apply when the package is soldered directly to the PCB. Junction-to-case thermal resistance for the H package is 20˚C/W. Junction-to-case thermal resistance for the TO-252 package is 5.4˚C/W. The value of θJA for the LLP package is typically 51˚C/W but is dependent on the PCB trace area, trace material, and the number of layers and thermal vias. For details of thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187. Note 9: May exceed input supply voltage. www.national.com 7 |
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