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LTC3826EG-1-TR Datasheet(PDF) 3 Page - Linear Technology |
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LTC3826EG-1-TR Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3826-1 3 38261fb ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ΔITH Voltage = 1.2V to 0.7V Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V l l 0.1 –0.1 0.5 –0.5 % % gm1, 2 Transconductance Amplifier gm ITH1, 2 = 1.2V; Sink/Source 5μA (Note 4) 0.5 mmho IQ Input DC Supply Current Sleep Mode (Channel 1 On) Sleep Mode (Channel 2 On) Shutdown Sleep Mode (Both Channels) (Note 5) RUN1 = 5V, RUN2 = 0V, VFB1 = 0.83V (No Load) RUN1 = OV, RUN2 = 5V, VFB2 = 0.83V (No Load) VRUN1, 2 = 0V RUN1,2 = 5V, VFB1 = VFB2 = 0.83V 30 30 4 50 50 50 10 75 μA μA μA μA UVLO Undervoltage Lockout VIN Ramping Down l 3.7 4 V VOVL Feedback Overvoltage Lockout Measured at VFB1, 2, Relative to Regulated VFB1, 2 810 12 % ISENSE Sense Pins Total Source Current (Each Channel) VSENSE1–, 2– = VSENSE1+, 2+ = 0V –220 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS1, 2 Soft-Start Charge Current VTRACK1, 2 = 0V 0.75 1 1.35 μA VRUN1, 2 ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 0.5 0.7 0.9 V VSENSE(MAX) Maximum Current Sense Threshold VFB1, 2 = 0.7V, VSENSE1–, 2– = 3.3V l 85 100 115 mV TG1, 2 tr TG1, 2 tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 50 50 90 90 ns ns BG1, 2 tr BG1, 2 tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 40 40 90 80 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 70 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 70 ns tON(MIN) Minimum On-Time (Note 7) 230 ns INTVCC Linear Regulator VINTVCCVIN Internal VCC Voltage 8.5V < VIN < 30V, VEXTVCC = 0V 5.0 5.25 5.5 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 0V 0.2 1.0 % VINTVCCEXT Internal VCC Voltage VEXTVCC = 8.5V 7.2 7.5 7.8 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 8.5V 0.2 1.0 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 0.2 V Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLLPF = Floating; PLLIN/MODE = DC Voltage 350 390 430 kHz fLOW Lowest Frequency VPLLLPF = 0V; PLLIN/MODE = DC Voltage 220 250 280 kHz fHIGH Highest Frequency VPLLLPF = INTVCC; PLLIN/MODE = DC Voltage 475 530 585 kHz fSYNCMIN Minimum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 0V 115 140 kHz fSYNCMAX Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V 650 800 kHz IPLLLPF Phase Detector Output Current Sinking Capability Sourcing Capability fPLLIN/MODE < fOSC fPLLIN/MODE > fOSC –5 5 μA μA PGOOD Output VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative VFB Ramping Positive –12 8 –10 10 –8 12 % % |
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