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LTC3780EG Datasheet(PDF) 5 Page - Linear Technology |
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LTC3780EG Datasheet(HTML) 5 Page - Linear Technology |
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5 / 30 page  LTC3780 5 3780ff For more information www.linear.com/LTC3780 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: TJ for the QFN package is calculated from the temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 34°C/W) Note 3: The IC is tested in a feedback loop that servos VITH to a specified voltage and measures the resultant VOSENSE. Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 5: Rise and fall times are measured using 10% and 90% levels. Delay times are measured using 50% levels. Note 6: The minimum on-time condition is specified for an inductor peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time considerations in the Applications Information section). Note 7: The LTC3780 is tested under pulsed load conditions such that TJ ≈ TA. The LTC3780E is guaranteed to meet specifications from 0°C to 85°C junction temperature. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3780I is guaranteed over the –40°C to 125°C operating junction temperature range, and the LTC3780MP is tested and guaranteed over the full –55°C to 125°C operating junction temperature range. Note 8: This parameter is guaranteed by design. Note 9: fOSC is the running frequency for the application. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS PGOOD Output ∆VFBH PGOOD Upper Threshold VOSENSE Rising 5.5 7.5 10 % ∆VFBL PGOOD Lower Threshold VOSENSE Falling –5.5 –7.5 –10 % ∆VFB(HYST) PGOOD Hysteresis VOSENSE Returning 2.5 % VPGL PGOOD Low Voltage IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 7) VIN = 15V unless otherwise noted. |
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