Datasheet LTC3731H (Analog Devices) - 5

LTC3731H Typical perForMance characTerisTics
Efficiency vs Frequency Efficiency vs IOUT (Figure 14) Efficiency vs VIN (Figure 14) (Figure 14)
100 100 100 VOUT = 1.5V ILOAD = 20A 90 VFCB = OPEN 95 f = 225kHz 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 V 55 OUT = 1.5V 0 50 75 0.1 1 10 100 0 5 10 15 20 25 200 300 400 500 600 LOAD CURRENT (A) V FREQUENCY (kHz) 3731H G01 IN (V) 3731H G02 3731H 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 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3731H G04 3731H G05 3731H 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 4 500 500 400 3 VPLLFLTR = 1.2V 300 400 2 FREQUENCY (kHz) 200 VPLLFLTR = 0V OPERATING FREQUENCY (kHz) 300 UNDER VOLTAGE RESET (V) 1 100 0 200 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) PLLFLTR PIN VOLTAGE (V) TEMPERATURE (°C) 3731H G07 3731H G09 3731H G08 3731Hfb Document Outline Features Applications 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