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LM2700MTX-ADJ Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2700MTX-ADJ Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 17 page Electrical Characteristics (Continued) Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. See the Electrical Characteristics table for the thermal resistance. The maximum allowable power dissipation at any ambient temperature is calculated using: PD (MAX) = (TJ(MAX) −TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Note 4: The human body model is a 100 pF capacitor discharged through a 1.5k Ω resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 6: Typical numbers are at 25˚C and represent the most likely norm. Note 7: Duty cycle affects current limit due to ramp generator. Note 8: Current limit at 0% duty cycle. See TYPICAL PERFORMANCE section for Switch Current Limit vs. VIN Note 9: Bias current flows into FB pin. Note 10: Does not include the bond wires. Measured directly at the die. Note 11: Refer to National’s packaging website for more detailed thermal information and mounting techniques for the LLP and TSSOP packages. Typical Performance Characteristics Efficiency vs. Load Current (V OUT = 8V, fS = 600 kHz) Efficiency vs. Load Current (V OUT = 8V, fS = 1.25 MHz) 20012326 20012325 Efficiency vs. Load Current (V OUT = 5V, fS = 600 kHz) Efficiency vs. Load Current (V OUT = 12V, fS = 600 kHz) 20012334 20012335 www.national.com 5 |
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