Datasheet LTC3827 (Analog Devices) - 5

LTC3827
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency and Power Loss vs Output Current Effi ciency vs Load Current Effi ciency vs Input Voltage
100 10000 100 98 Burst Mode OPERATION VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V 96 PULSE SKIPPING MODE 90 VOUT = 3.3V 80 1000 POWER LOSS (mW) 94 70 80 92 60 100 50 70 90 40 10 88 EFFICIENCY (%) EFFICIENCY (%) 60 EFFICIENCY (%) 30 VIN = 12V VOUT = 3.3V 86 20 1 50 84 V 10 OUT = 3.3V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT 0 0.1 40 82 0.001 0.01 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 LOAD CURRENT (mA) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3827 G01 3827 G02 3827 G03
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse Skip Mode)
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC AC AC COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 20μs/DIV 20μs/DIV 20μs/DIV 3827 G04 3827 G05 3827 G06 VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
VOUT2 VOUT2 2V/DIV 2V/DIV FORCED CONTINUOUS MODE VOUT1 VOUT1 2V/DIV 2V/DIV 2A/DIV BURST MODE OPERATION PULSE SKIPPING MODE 4μs/DIV 20ms/DIV 20ms/DIV 3827 G07 3827 G08 3827 G09 VOUT = 3.3V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT ILOAD = 300μA FIGURE 13 CIRCUIT 3827ff 5