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LTC3813 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3813 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3813 3 3813fb SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VFB Feedback Voltage (Note 4) 0°C to 85°C –40°C to 85°C –40°C to 125°C (I-Grade) l l l 0.796 0.794 0.792 0.792 0.800 0.800 0.800 0.800 0.804 0.806 0.806 0.808 V V V V ΔVFB,LINE Feedback Voltage Line Regulation 7V < INTVCC < 14V (Note 4) l 0.002 0.02 %/V VSENSE(MAX) Maximum Current Sense Threshold VRNG = 2V, VFB = 0.76V VRNG = 0V, VFB = 0.76V VRNG = INTVCC, VFB = 0.76V 256 70 170 320 95 215 384 120 260 mV mV mV VSENSE(MIN) Minimum Current Sense Threshold VRNG = 2V, VFB = 0.84V VRNG = 0V, VFB = 0.84V VRNG = INTVCC, VFB = 0.84V –300 –85 –200 mV mV mV IVFB Feedback Current VFB = 0.8V 20 150 nA AVOL(EA) Error Amplifier DC Open Loop Gain 65 100 dB fU Error Amp Unity Gain Crossover Frequency (Note 6) 25 MHz ISYNC SYNC Current SYNC = 10V 0 1 μA VSHDN Shutdown Threshold 1.2 1.5 2 V ISHDN SHDN Pin Input Current 01 μA ISS SS Source Current VSS > 0.5V 0.7 1.4 2.5 μA VVINUV VIN Undervoltage Lockout VIN Rising VIN Falling Hysteresis l l 0.86 0.78 0.07 0.88 0.80 0.10 0.92 0.82 0.12 V V V VVCCUV INTVCC Undervoltage Lockout INTVCC Rising Hysteresis l 6.05 6.2 0.5 6.35 V V Oscillator and Phase-Locked Loop tOFF Off-Time IOFF = 100μA IOFF = 300μA 1.55 515 1.85 605 2.15 695 μs ns tOFF(MIN) Minimum Off-Time IOFF = 2000μA 100 ns tON(MIN) Minimum On-Time 350 ns tOFF(PLL) tOFF Modulation Range by PLL Down Modulation Up Modulation IOFF = 100μA, VPLL/LPF = 0.6V IOFF = 100μA, VPLL/LPF = 1.8V 2.2 0.6 3.6 1.2 5 1.8 μs μs IPLL/LPF Phase Detector Output Current Sinking Capability Sourcing Capability fPLLIN < fSW fPLLIN > fSW 15 –25 μA μA Driver IBG,PEAK BG Driver Peak Source Current VBG = 0V 1.5 2 A RBG,SINK BG Driver Pulldown RDS(ON) 1 1.5 Ω ITG,PEAK TG Driver Peak Source Current VTG – VSW = 0V 1.5 2 A RTG,SINK TG Driver Pulldown RDS(ON) 1 1.5 Ω PGOOD Output ΔVFBOV PGOOD Upper Threshold PGOOD Lower Threshold VFB Rising VFB Falling 7.5 –7.5 10 –10 12.5 –12.5 % % ΔVFB,HYST PGOOD Hysteresis VFB Returning 1.5 3 % VPGOOD PGOOD Low Voltage IPGOOD = 5mA 0.3 0.6 V The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, INTVCC = DRVCC = VBOOST = VOFF = VRNG = SHDN = UVIN = VEXTVCC = VNDRV = 10V, VSYNC = VSENSE+ = VSENSE– = VBGRTN = VSW = 0V, unless otherwise specified. ELECTRICAL CHARACTERISTICS |
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