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LTC3868IUHPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3868IUHPBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 38 page LTC3868 3868fb 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 Shutdown Current vs Temperature INPUT VOLTAGE (V) 5 350 20 3868 G10 200 100 10 15 25 28 50 0 400 300 250 150 300µA LOAD FIGURE 12 CIRCUIT VOUT = 3.3V ONE CHANNEL ON NO LOAD TEMPERATURE (°C) –45 5.4 30 3868 G11 4.8 4.4 –20 5 55 4.2 4.0 5.6 5.2 5.0 4.6 80 105 130 INTVCC EXTVCC RISING EXTVCC FALLING INPUT VOLTAGE (V) 0 5.0 5.1 5.1 5.2 5.2 5 10 15 20 3868 G12 25 28 VSENSE COMMON MODE VOLTAGE (V) 0 –600 –500 –550 –450 –400 –300 –350 –200 –250 0 5 10 15 3868 G14 –50 –100 –150 FEEDBACK VOLTAGE (V) 0 0 10 30 40 50 0.6 90 3868 G16 20 0.3 0.1 0.7 0.4 0.2 0.8 0.5 0.9 60 70 80 ILIM = INTVCC ILIM = FLOAT ILIM = GND ITH PIN VOLTAGE 0 40 60 80 0.6 1.0 3868 G13 20 0 0.2 0.4 0.8 1.2 1.4 –20 –40 PULSE-SKIPPING FORCED CONTINUOUS Burst Mode OPERATION (FALLING) Burst Mode OPERATION (RISING) ILIM = GND ILIM = FLOAT ILIM = INTVCC 5% DUTY CYCLE DUTY CYCLE (%) 0 40 60 80 3868 G15 20 0 20 40 50 100 80 60 10 30 90 70 ILIM = INTVCC ILIM = FLOAT ILIM = GND TEMPERATURE (°C) –45 110 120 190 200 240 220 –20 30 55 130 3868 G17 230 210 150 160 130 140 180 170 5 80 105 PLLIN/MODE = 0 VIN = 12V VOUT = 3.3V ONE CHANNEL ON TEMPERATURE (°C) –45 8 9 10 30 80 3868 G18 7 6 –20 5 55 105 130 5 4 |
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