Datasheet LTC3811 (Analog Devices) - 6

LTC3811
TYPICAL PERFORMANCE CHARACTERISTICS Load Step (Forced Continuous Load Step (Pulse Skip Mode) Load Step (Forced Continuous) with Voltage Positioning)
VOUT V 50mV/DIV OUT VOUT 50mV/DIV 50mV/DIV AC COUPLED AC COUPLED AC COUPLED IL IL IL1 5A/DIV 5A/DIV 5A/DIV IL2 5A/DIV 20μs/DIV 3811 G01 VIN = 12V 20μs/DIV 3811 G02 VIN = 12V 50μs/DIV 3811 G03 VIN = 12V VOUT = 1.5V VOUT = 1.5V VOUT = 1.5V (2-PHASE) ILOAD = 0.5A TO 8A ILOAD = 0.5A TO 8A ILOAD = 0A TO 15A
Light Load Waveforms Light Load Waveforms Low Duty Cycle Waveforms (Forced Continuous Mode) (Pulse Skip Mode)
SW SW SW 5V/DIV 5V/DIV 10V/DIV VOUT VOUT 20mV/DIV 20mV/DIV AC COUPLED AC COUPLED IL 2A/DIV I I L L 5A/DIV 5A/DIV 250ns/DIV 3811 G04 V 1μs/DIV 3811 G05 V IN = 20V IN = 12V 1μs/DIV 3811 G06 VIN = 12V V V OUT = 1.2V OUT = 1.5V VOUT = 1.5V I I LOAD = 1.5A LOAD = 300mA ILOAD = 300mA
Effi ciency vs Load Current with Effi ciency vs Load Current with RSENSE = 1.5m
Ω
DCR Sensing Short-Circut Waveforms
100 100 VIN = 12V VIN = 12V 95 VOUT = 2V 95 VOUT = 2V IL 5A/DIV 90 90 85 85 PGOOD 5V/DIV 80 80 VOUT 75 EFFICIENCY (%) 75 EFFICIENCY (%) 1V/DIV 70 70 200μs/DIV 3811 G09 VIN = 12V 65 DISCONTINUOUS 65 DISCONTINUOUS VOUT = 1.5V FORCED CONTINUOUS FORCED CONTINUOUS 60 60 1 10 100 1 10 100 LOAD CURRENT (A) LOAD CURRENT (A) 3811 G07 3811 G08 3811f 6