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LP2985IM5-3.5 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LP2985IM5-3.5 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 21 page Electrical Characteristics (Note 10) (Continued) Limits in standard typeface are for T J = 25˚C. and limits in boldface type apply over the full operating temperature range. Un- less otherwise specified: V IN =VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V. Symbol Parameter Conditions Typ LP2985AI-X.X LP2985I-X.X Units (Note 6) (Note 6) Min Max Min Max e n Output Noise BW = 300 Hz to 50 kHz, Voltage (RMS) C OUT =10µF 30 µV C BYPASS =10nF Ripple Rejection f = 1 kHz, C BYPASS =10nF 45 dB C OUT =10µF I O(SC) Short Circuit Current R L = 0 (Steady State) 400 mA (Note 9) I O(PK) Peak Output Current V OUT ≥ V o(NOM) −5% 350 mA Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV. Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using: Where the value of θJ-A for the SOT-23 package is 220˚C/W in a typical PC board mounting and the micro SMD package is 225˚C/W. Exceeding the maximum allowable dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Note 4: For 12V option, output voltage survival: -0.3 to +16V. If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2985 output must be diode-clamped to ground. Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will turn on this diode. Note 6: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL). Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential. Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints. Note 9: The LP2985 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is forced to ground (see Typical Performance Characteristics curves). Note 10: Exposing the micro SMD device to direct sunlight will cause misoperation. See Application Hints for additional information. Note 11: For 12V option, add 50 µA to all ON state quiescent current values. www.national.com 8 |
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