Datasheet LTC3545, LTC3545-1 (Analog Devices) - 5

LTC3545/LTC3545-1
TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Temperature, Effi ciency vs Load Current, Effi ciency vs Load Current, Pulse Skipping Burst Mode Operation Pulse Skipping Operation
450 100 100 90 90 400 80 80 70 70 350 60 60 300 50 50 VIN = 2.7V V 40 IN = 2.7V V 40 IN = 3.6V V 250 EFFICIENCY (%) EFFICIENCY (%) IN = 3.6V 30 VIN = 4.2V 30 VIN = 4.2V SUPPLY CURRENT (μA) VIN = 5.5V T T 20 A = 25°C 20 A = 25°C 200 V V V V FB3 = 0.625V IN = 4.5V OUT = 1.8V OUT = 1.8V I V CHANNEL 3, OTHER CHANNELS OFF CHANNEL 3, OTHER CHANNELS OFF LOAD = 0mA IN = 3.5V 10 10 CHANNEL 3 ONLY VIN = 2.5V fOSC = 2.25MHz fOSC = 2.25MHz 150 0 0 –50 0 50 100 150 0.1 1 10 100 1000 0.1 1 10 100 1000 TEMPERATURE (°C) LOAD CURRENT (mA) LOAD CURRENT (mA) 3545 G07 3545 G08 3545 G09
Channel 1 Load Step Response Channel 2 Load Step Response Channel 3 Load Step Response
VOUT1 VOUT2 VOUT3 100mV/DIV 100mV/DIV 100mV/DIV IL IL IL 500mA/DIV 500mA/DIV 500mA/DIV ILOAD ILOAD ILOAD 500mA/DIV 500mA/DIV 500mA/DIV 3545 G10 3545 G11 3545 G12 T 10μs/DIV A = 25°C T 10μs/DIV A = 25°C T 10μs/DIV A = 25°C VIN = 3.6V VIN = 3.6V VIN = 3.6V VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V LOAD STEP 0mA TO 600mA LOAD STEP 0mA TO 600mA LOAD STEP 0mA TO 600mA Burst Mode OPERATION Burst Mode OPERATION Burst Mode OPERATION 35451fb 5