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LTC3856IUH-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3856IUH-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 40 page LTC3856 3856f elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS TG1,2 tr TG1,2 tf TG Transition Time Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns BG1,2 tr BG1,2 tf BG Transition Time Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns tON(MIN) Minimum On-Time (Note 7) 90 ns INTVCC Linear Regulator VINTVCC Internal VCC Voltage 6V < VIN ≤ 38V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.5 2.0 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive l 4.5 4.7 V VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 50 100 mV VLDOHYS EXTVCC Hysteresis 200 mV Oscillator and Phase-Locked Loop fNOM Nominal Frequency VFREQ = 1.2V 450 500 550 kHz fLOW Lowest Frequency VFREQ = 0V 210 250 290 kHz fHIGH Highest Frequency VFREQ ≥ 2.4V 700 770 850 kHz RMODE MODE Input Resistance 250 kΩ IFREQ Frequency Setting Output Current 9 10 11 µA CLKOUT Phase (Relative to Controller 1) PHASMD = GND; Non Stage Shedding Mode PHASMD = FLOAT; Non Stage Shedding Mode PHASMD = INTVCC; Non Stage Shedding Mode Stage Shedding Mode 60 90 120 180 Deg Deg Deg Deg CLKHIGH Clock High Output Voltage 4 5 V CLKLOW Clock Low Output Voltage 0 0.2 V PGOOD Output VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.2 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±2 µA VPG PGOOD Trip Level, Either Controller VFB with Respect to Set Output Voltage VFB Ramping Negative VFB Ramping Positive –10 10 % % |
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