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LTC7803 Datasheet(PDF) 7 Page - Analog Devices |
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LTC7803 Datasheet(HTML) 7 Page - Analog Devices |
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7 / 42 page  LTC7811 7 Rev. 0 For more information www.analog.com TYPICAL PERFORMANCE CHARACTERISTICS Load Step (Buck) Burst Mode Operation Load Step (Buck) Forced Continuous Mode Load Step (Buck) Pulse-Skipping Mode Inductor Current at Light Load (Buck) Soft Start-Up Buck Regulated Feedback Voltage vs Temperature Efficiency and Power Loss vs Output Current (Buck 5V Output) Efficiency and Power Loss vs Output Current (Buck 3.3V Output) Efficiency vs Input Voltage (Buck) VIN = 12V VOUT = 5V BURST EFFICIENCY PULSE–SKIPPING EFFICIENCY FIGURE 10 CIRCUIT FCM EFFICIENCY BURST LOSS PULSE–SKIPPING LOSS FCM LOSS OUTPUT CURRENT (A) 0.0001 0.001 0.01 0.1 1 10 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 100 Output Current (Buck 5V Output) Efficiency and Power Loss vs 7811 G01 VIN = 12V VOUT = 3.3V BURST EFFICIENCY PULSE–SKIPPING EFFICIENCY FIGURE 10 CIRCUIT FCM EFFICIENCY BURST LOSS PULSE–SKIPPING LOSS FCM LOSS OUTPUT CURRENT (A) 0.0001 0.001 0.01 0.1 1 10 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 100 Output Current (Buck 3.3V Output) Efficiency and Power Loss vs 7811 G02 FIGURE 10 CIRCUIT ILOAD = 3A (EACH CHANNEL) VOUT1 = 3.3V VOUT2 = 5V INPUT VOLTAGE (V) 4 12 20 28 36 70 75 80 85 90 95 100 Efficiency vs Input Voltage (Buck) 7811 G03 Burst Mode Operation Load Step (Buck) VIN = 12V VOUT1 = 3.3V 200mA TO 4A LOAD STEP FIGURE 10 CIRCUIT 50µs/DIV VOUT1 500mV/DIV INDUCTOR CURRENT 5A/DIV LOAD CURRENT 5A/DIV 7811 G04 Pulse–Skipping Mode Load Step (Buck) VIN = 12V VOUT1 = 3.3V 200mA TO 4A LOAD STEP FIGURE 10 CIRCUIT 50µs/DIV VOUT1 500mV/DIV INDUCTOR CURRENT 5A/DIV LOAD CURRENT 5A/DIV 7811 G05 Forced Continuous Mode Load Step (Buck) VIN = 12V VOUT1 = 3.3V 200mA TO 4A LOAD STEP FIGURE 10 CIRCUIT 50µs/DIV VOUT1 500mV/DIV INDUCTOR CURRENT 5A/DIV LOAD CURRENT 5A/DIV 7811 G06 (Buck) Inductor Current at Light Load VIN = 12V VOUT1 = 3.3V NO LOAD FIGURE 10 CIRCUIT 4µs/DIV Burst Mode OPERATION 2A/DIV PULSE SKIPPING MODE FORCED CONTINUOUS MODE 7811 G07 Soft Start–Up RUN1,2 5V/DIV VOUT1 1V/DIV VOUT2 1V/DIV VIN = 12V FIGURE 10 CIRCUIT 1ms/DIV 7811 G08 TEMPERATURE (°C) –55 –25 5 35 65 95 125 155 792 794 796 798 800 802 804 806 808 Voltage vs Temperature Buck Regulated Feedback 7811 G09 |
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