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LTC3569 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3569 Datasheet(HTML) 5 Page - Linear Technology |
5 / 24 page LTC3569 5 3569f Efficiency vs VSUPPLY OUT1 = 1.8V Efficiency vs VSUPPLY OUT2 = 1.2V Efficiency vs VSUPPLY OUT3 = 1.5V TYPICAL PERFORMANCE CHARACTERISTICS Oscillator Frequency vs Temperature RDS(ON) SW1 vs VSUPPLY and Temperature RDS(ON) SW2 and SW3 vs VSUPPLY and Temperature VFB vs Temperature ISVIN vs VSUPPLY Pulse Skip ISVIN vs VSUPPLY Burst Mode Operation VSUPPLY (V) 2 95 90 75 85 80 70 65 4 3569 G04 6 5 3 BUCK1 ONLY ILOAD = 270mA ILOAD = 220mA ILOAD = 170mA ILOAD = 120mA VSUPPLY (V) 2 95 90 75 85 80 70 65 4 3569 G05 6 5 3 BUCK2 ONLY ILOAD = 210mA ILOAD = 170mA ILOAD = 110mA ILOAD = 70mA VSUPPLY (V) 2 95 90 75 85 80 70 65 4 3569 G06 6 5 3 BUCK3 ONLY ILOAD = 210mA ILOAD = 170mA ILOAD = 110mA ILOAD = 70mA TEMPERATURE (°C) –50 2.40 2.30 2.10 2.20 2.00 50 3569 G07 150 100 0 VIN = 5.5V VIN = 3.5V VIN = 2.5V VRT = SVIN VSUPPLY (V) 2 0.35 0.30 0.20 0.25 0.15 0.10 4 3569 G08 6 5 3 NSW1 PSW1 100°C 25°C –50°C VSUPPLY (V) 2 0.50 0.30 0.35 0.40 0.45 0.20 0.25 0.15 0.10 4 3569 G09 6 5 3 NSW2 & 3 PSW3 & 3 100°C 25°C –50°C TEMPERATURE (°C) –50 0.3 0.2 –0.2 –0.1 0.1 0.0 –0.3 50 3569 G10 150 100 0 VREF SET TO MAX VFB1 VFB2 VFB3 VSUPPLY (V) 2 700 400 500 600 200 300 100 0 4 3569 G11 6 5 3 ALL 3 2 BUCKS ENABLED 1 BUCK ENABLED NO LOAD VSUPPLY (V) 2 120 60 80 100 20 40 0 4 3569 G12 6 5 3 ALL 3 2 BUCKS ENABLED 1 BUCK ENABLED NO LOAD TA = 25°C, unless otherwise noted. |
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