Datasheet LTC3731 (Analog Devices) - 6

LTC3731
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs IOUT (Figure 14) Efficiency vs VIN (Figure 14) Efficiency vs Frequency (Figure 14)
100 100 100 VOUT = 1.5V ILOAD = 20A 90 VFCB = OPEN 95 f = 250kHz VOUT = 1.5V 80 VFCB = 5V 90 IL = 15A 95 V 70 FCB = 0V 85 VIN = 5V IL = 45A 60 80 90 50 75 VIN = 12V VIN = 8V 40 70 85 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 65 VIN = 20V 20 60 80 10 VIN = 8V 55 VOUT = 1.5V 0 50 75 0.1 1 10 100 0 5 10 15 20 25 200 300 400 500 600 LOAD CURRENT (A) VIN (V) FREQUENCY (kHz) 3731 G01 3731 G02 3731 G03
Reference Voltage Error Amplifier gm Maximum ISENSE Threshold vs Temperature vs Temperature vs Temperature
610 6.0 85 605 5.5 80 (mmho) m VO = 1.75V 600 5.0 THRESHOLD (mV) 75 SENSE VO = 0.6V REFERENCE VOLTAGE (mV) 595 4.5 70 ERROR AMPLIFIER g MAXIMUM I 590 4.0 65 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3731 G04 3731 G05 3731 G06
Oscillator Frequency Undervoltage Reset Voltage vs Temperature Operating Frequency vs VPLLFLTR vs Temperature
700 700 5 V 600 PLLFLTR = 2.4V VPLLFLTR = 5V 600 4 500 400 500 3 VPLLFLTR = 1.2V 300 400 2 FREQUENCY (kHz) 200 VPLLFLTR = 0V OPERATING FREQUENCY (kHz) 300 UNDERVOLTAGE RESET (V) 1 100 0 200 0 –50 –25 0 25 50 75 100 125 0 0.5 1 1.5 2 2.5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) PLLFLTR PIN VOLTAGE (V) TEMPERATURE (°C) 3731 G07 3731 G09 3731 G08 3731fc 6 Document Outline Features Applications Features Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts