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LTC3890IUH Datasheet(PDF) 5 Page - Linear Technology |
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LTC3890IUH Datasheet(HTML) 5 Page - Linear Technology |
5 / 36 page LTC3890 5 3890f TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Output Current Efficiency vs Output Current Load Step Burst Mode Operation Load Step Forced Continuous Mode Load Step Pulse-Skipping Mode Inductor Current at Light Load Soft Start-Up Tracking Start-Up Efficiency vs Input Voltage OUTPUT CURRENT (A) FIGURE 13 CIRCUIT 0 70 100 1 0.1 0.01 0.001 0.0001 10 3890 G01 50 40 30 20 1 10 100 1000 10000 0.1 10 60 80 90 VIN = 12V VOUT = 3.3V BURST EFFICIENCY CCM LOSS PULSE-SKIPPING LOSS BURST LOSS CCM EFFICIENCY PULSE-SKIPPING EFFICIENCY OUTPUT CURRENT (A) 0 70 100 1 0.1 0.01 0.001 0.0001 10 3890 G02 50 40 30 20 10 60 80 90 VOUT = 8.5V VOUT = 3.3V VIN = 12V Burst Mode OPERATION FIGURE 13 CIRCUIT INPUT VOLTAGE (V) 80 94 100 20 30 35 40 45 50 55 60 15 10 5 025 3890 G03 90 88 86 84 82 92 96 98 VOUT1 = 3.3V VOUT2 = 8.5V ILOAD = 2A FIGURE 13 CIRCUIT VIN = 12V VOUT = 3.3V FIGURE 13 CIRCUIT 50μs/DIV 3890 G04 VOUT 100mV/DIV AC- COUPLED IL 2A/DIV VIN = 12V VOUT = 3.3V FIGURE 13 CIRCUIT 50μs/DIV 3890 G05 VOUT 100mV/DIV AC- COUPLED IL 2A/DIV VIN = 12V VOUT = 3.3V FIGURE 13 CIRCUIT 50μs/DIV 3890 G06 VOUT 100mV/DIV AC- COUPLED IL 2A/DIV VIN = 12V VOUT = 3.3V ILOAD = 200μA 5μs/DIV 3890 G07 FORCED CONTINUOUS MODE PULSE-SKIPPING MODE Burst Mode OPERATION 1A/DIV FIGURE 13 CIRCUIT 2ms/DIV 3890 G08 VOUT2 2V/DIV VOUT1 2V/DIV FIGURE 13 CIRCUIT 2ms/DIV 3890 G09 VOUT2 2V/DIV VOUT1 2V/DIV |
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