Datasheet LTC3731 (Analog Devices) - 7

LTC3731
TYPICAL PERFORMANCE CHARACTERISTICS Short-Circuit Arming and Latchoff RUN/SS Pull-Up Current vs Temperature Supply Current vs Temperature vs Temperature
5 100 2.5 2.8 VCC = 5V VRUN/SS = 1.9V ARMING 4 SHUTDOWN CURRENT (µA) 2.4 80 2.0 2.0 3 LATCHOFF 60 1.5 1.6 2 1.2 40 1.0 RUN/SS PIN VOLTAGE (V) SUPPLY CURRENT (mA) 0.8 1 20 0.4 RUN/SS PULL-UP CURRENT (µA) 0.5 0 0 0 0 –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 G10 3731 G11 3731 G12
Maximum Current Sense Maximum ISENSE vs VRUN/SS Threshold vs Duty Factor Peak Current Threshold vs VITH
80 75 75 70 60 60 (mV) 50 45 50 SENSE 40 30 VOLTAGE (mV) 30 25 15 MAXIMUM I 20 I SENSE VOLTAGE THRESHOLD (mV) 0 10 I SENSE 0 0 –15 0 1 2 3 4 5 6 0 20 40 60 80 100 0 0.6 1.2 1.8 2.4 VRUN/SS VOLTAGE (V) DUTY FACTOR (%) VITH (V) 3731 G15 3731 G13 3731 G14
Percentage of Nominal Output Maximum Duty Factor vs Peak ISENSE (Foldback) vs Temperature ISENSE Pin Current vs VOUT
80 100 40 VPLLFLTR = 0V 70 30 98 60 20 50 96 10 VOLTAGE (mV) 40 0 94 SENSE 30 PIN CURRENT (µA) –10 PEAK I 20 I SENSE MAXIMUM DUTY FACTOR (%) 92 10 –20 0 90 –30 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 PERCENTAGE OF NOMINAL OUTPUT VOLTAGE (%) TEMPERATURE (°C) VOUT (V) 3731 G17 3731 G16 3731 G18 3731fc 7 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