Datasheet LTC3545, LTC3545-1 (Analog Devices) - 4

LTC3545/LTC3545-1
TYPICAL PERFORMANCE CHARACTERISTICS VREF vs Temperature at 2.25V, Switching Frequency vs Supply 3.6V, 5.5V Voltage and Temperature Load Regulation, All Channels
0.615 3.0 1.2 TA = 25°C 1.0 VIN = 3.6V 0.610 UNTESTED CHANNELS OFF 0.8 PULSE SKIP MODE 0.605 2.5 CHANNEL 1 0.6 CHANNEL 2 (V) CHANNEL 3 0.600 0.4 REFV ERROR (%) OUT 0.2 0.595 2.0 V f 0 OSC = –40°C 0.590 2.25V SWITCHING FREQUENCY (MHz) fOSC = 0°C 3.6V f –0.2 OSC = 25°C 5.5V fOSC = 80°C 0.585 1.5 –0.4 –50 0 50 100 150 2 3 4 5 6 0 200 400 600 800 TEMPERATURE (°C) SUPPLY VOLTAGE (V) LOAD CURRENT (mA) 3545 G01 3545 G02 3545 G03
Supply Current vs Temperature Burst Mode Operation Effi ciency vs Supply Voltage Burst Mode Operation
100 60 VOUT = 2V TA = 25°C SW CHANNEL 3, ALL OTHERS OFF 50 2V/DIV 95 fOSC = 2.25MHz ILOAD = 250mA 40 VOUT 20mV/DIV 90 30 IL 100mA/DIV EFFICIENCY (%) 20 85 SUPPLY CURRENT (μA) VIN = 5.5V V V 3545 G04 10 FB3 = 0.625V IN = 4.5V VIN = 3.6V 1μs/DIV I V LOAD = 0mA IN = 3.5V VOUT = 1.8V CHANNEL 3 ONLY VIN = 2.5V ILOAD = 50mA 80 0 fOSC = 2.25MHz 2 3 4 5 6 –50 0 50 100 150 SUPPLY VOLTAGE (V) TEMPERATURE (°C) 3545 G06 3545 G05 35451fb 4