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LTC3857EGN-1PBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3857EGN-1PBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 38 page LTC3857-1 38571fa Typical perForMance characTerisTics Total Input Supply Current vs Input Voltage EXTVCC Switchover and INTVCC Voltages vs Temperature INTVCC Line Regulation Maximum Current Sense Voltage vs ITH Voltage SENSE– Pin Input Bias Current Maximum Current Sense Threshold vs Duty Cycle Foldback Current Limit Quiescent Current vs Temperature INTVCC and EXTVCC vs Load Current INPUT VOLTAGE (V) 5 0 50 150 200 250 500 350 15 25 30 38571 G10 100 400 450 300 10 20 35 40 NO LOAD 300µA 500µA VOUT1 = 3.3V RUN2 = 0V FIGURE 13 CIRCUIT TEMPERATURE (°C) –45 4.0 4.2 4.6 4.8 5.0 6.0 5.4 5 55 80 38571 G11 4.4 5.6 5.8 5.2 –20 30 105 130 INTVCC EXTVCC RISING EXTVCC FALLING VSENSE COMMON MODE VOLTAGE (V) 0 –600 –500 –400 –300 –200 0 5 10 15 20 38571 G14 25 –100 –550 –450 –350 –250 –50 –150 TEMPERATURE (°C) –45 75 30 38571 G17 60 50 –20 5 55 45 40 80 70 65 55 80 105 130 LOAD CURRENT (mA) 0 5.10 5.15 5.20 160 38571 G18 5.05 5.00 4.95 20 40 60 80 100 120 140 180 200 EXTVCC = 0V EXTVCC = 8.5V VIN = 12V INPUT VOLTAGE (V) 0 5.0 5.1 40 38571 G12 4.9 4.8 10 20 30 5 15 25 35 5.2 VITH (V) 0 40 60 80 0.6 1.0 38571 G13 20 0 0.2 0.4 0.8 1.2 1.4 –20 –40 Burst Mode OPERATION PULSE-SKIPPING MODE 5% DUTY CYCLE FORCED CONTINUOUS MODE DUTY CYCLE (%) 0 40 60 80 38571 G15 20 0 20 40 50 100 80 60 10 30 90 70 FEEDBACK VOLTAGE (V) 0 0 10 30 40 50 0.6 90 38571 G16 20 0.3 0.1 0.7 0.4 0.2 0.8 0.5 0.9 60 70 80 |
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