Datasheet LTC3773 (Analog Devices) - 8

LTC3773
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Current Limit SENSE Pin Input Current vs Threshold vs VFB SENSE Common Mode Voltage
80 40 V V TRACK = 1V CC = 5V I + = I – 70 30 SENSE = ISENSE SENSE 60 20 50 μA) 10 (mV) ( 40 I SENSE 0 V SENSE 30 –10 20 –20 10 0 –30 0 100 200 300 400 500 600 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 V V FB (mV) SENSE COMMON MODE VOLTAGE (V) 3773 G18 3773 G19
Switching Frequency Synchronization Switching vs Temperature Frequency vs VPLLFLTR
650 800 VCC = 5V 600 VPLLFLTR = 5V 700 550 500 600 450 PLLFLTR FLOATING 500 400 400 350 300 300 SWITCHING FREQUENCY (kHz) 250 VPLLFLTR = 0V 200 200 150 100 –50 –25 0 25 50 75 100 125 SYNCHRONIZATION SWITCHING FREQUENCY (kHz) 0 0.5 1 1.5 2 2.5 3 TEMPERATURE (°C) VPLLFLTR (V) 3773 G20 3773 G21
TG Minimum Pulse Width Maximum Duty Factor vs Temperature vs Temperature
180 100 VSENSE = 100mV STEP VPLLFLTR = 0V 96 DROPOUT 160 PLLFLTR FLOATING VPLLFLTR = 5V 92 VPLLFLTR = 0V, fSW = 220kHz 140 88 VPLLFLTR FLOATING, fSW = 400kHz 120 MAXIMUM DUTY FACTOR (%) 84 TG MINIMUM PULSE WIDTH (ns) TG, BG OPEN V 100 80 PLLFLTR = 5V, fSW = 560kHz –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 3773 G22 3773 G23 3773fb 8