Datasheet LTC3541 (Analog Devices) - 6

LTC3541
TYPICAL PERFORMANCE CHARACTERISTICS Oscillator Frequency Oscillator Frequency VLDO/Linear Regulator Reference vs Temperature vs Supply Voltage vs Temperature
2.50 0.410 V 2.5 IN = 3.6V V V 2.45 IN = 3.6V IN = 3.6V 0.408 2.40 2.4 0.406 2.35 0.404 2.30 2.3 0.402 2.25 0.400 2.20 0.398 2.2 REFERENCE (V) FREQUENCY (MHz) 2.15 FREQUENCY (MHz) 0.396 2.10 0.394 2.1 2.05 0.392 2.00 0.390 –50 –25 0 25 50 75 100 125 2.0 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) 3 4 5 6 TEMPERATURE (°C) SUPPLY VOLTAGE (V) 3541 G10 5341 G12 3541 G11
Buck Reference vs Temperature RDS(ON) vs Temperature Buck (Burst) and VLDO Output
0.820 0.700 VIN = 3.6V 0.816 0.600 LVOUT 0.812 10mV/DIV AC COUPLED 0.808 0.500 0.804 ) VOUT (Ω 0.400 0.800 10mV/DIV SYNCH SWITCH AC COUPLED 0.796 0.300 REFERENCE (V) R DS(ON) 0.792 0.200 0.788 V V 2μs/DIV 3541 G15 0.784 0.100 IN = 2.5V MAIN SWITCH IN = 3.6V VIN = 3.6V LVOUT = 1.5V 0.780 VIN = 5.5V VOUT = 1.8V –50 –25 0 25 50 75 100 125 0 ILOAD = 50mA TEMPERATURE (°C) –50 –25 0 25 50 75 100 125 Burst Mode OPERATION TEMPERATURE (°C) 5341 G13 3541 G14
Buck (Pulse Skip) Load Step from Buck (Burst) Load Step from VLDO Load Step from 1mA to 500mA 1mA to 500mA 1mA to 500mA
VOUT VOUT 100mV/DIV 100mV/DIV AC COUPLED AC COUPLED LVOUT 20mV/DIV AC COUPLED IL IL 500mA/DIV 500mA/DIV ILOAD ILOAD ILOAD 500mA/DIV 500mA/DIV 250mA/DIV VIN = 3.6V 40μs/DIV 3541 G16 VIN = 3.6V 40μs/DIV 3541 G17 VIN = 3.6V 400μs/DIV 3541 G18 VOUT = 1.8V VOUT = 1.8V LVOUT = 1.5V ILOAD = 1mA TO 500mA ILOAD = 1mA TO 500mA ILOAD = 1mA TO 300mA 3541fb 6 For more information www.linear.com/LTC3541 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information BUCK Regulator VLDO/Linear regulator Applications Information Efficiency Considerations Thermal Considerations Applications Information Pc Board Layout Checklist Design Example Typical Applications Package Description Revision History Related Parts