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LTC3780IG Datasheet(PDF) 4 Page - Linear Technology |
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LTC3780IG Datasheet(HTML) 4 Page - Linear Technology |
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4 / 28 page  4 LTC3780 3780f The ● indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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 LTC3780E is guaranteed to meet performance specifications from 0°C to 85°C. Performance over the –40°C to 85°C operating temperature range is assured by design, characterization and correlation with statistical process controls. The LTC3780I is guaranteed and tested over the – 40°C to 85°C operating temperature range. tON(MIN,BOOST) Minimum On-Time for Main Switch in Switch C (Note 6) 200 240 ns Boost Operation tON(MIN,BUCK) Minimum On-Time for Synchronous Switch B (Note 6) 180 220 ns Switch in Buck Operation Internal VCC Regulator VINTVCC Internal VCC Voltage 7V < VIN < 30V, VEXTVCC = 5V ● 5.7 6 6.3 V ∆VLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 5V 0.2 2 % VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, VEXTVCC Rising ● 5.4 5.7 V ∆VEXTVCC(HYS) EXTVCC Switchover Hysteresis 200 mV ∆VEXTVCC EXTVCC Switch Drop Voltage ICC = 20mA, VEXTVCC = 6V 150 300 mV Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLFLTR = 1.2V 260 300 330 kHz fLOW Lowest Frequency VPLLFLTR = 0V 170 200 220 kHz fHIGH Highest Frequency VPLLFLTR = 2.4V 340 400 440 kHz RPLLIN PLLIN Input Resistance 50 kΩ IPLLLPF Phase Detector Output Current fPLLIN < fOSC –15 µA fPLLIN > fOSC 15 µA 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 |
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Similar Description - LTC3780IG |
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