Datasheet LTC3892, LTC3892-1, LTC3892-2 (Analog Devices) - 9

LTC3892/ LTC3892-1/LTC3892-2
TYPICAL PERFORMANCE CHARACTERISTICS SENSE Pins Total Input Current SENSE– Pin Input Bias Current vs vs VSENSE Voltage Temperature
800 900 700 800 VOUT > INTVCC + 0.5V 600 700 600 500 500 400 400 300 300 SENSE CURRENT (µA) 200 SENSE CURRENT (µA) 200 100 100 VOUT < INTVCC – 0.5V 0 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 –75 –50 –25 0 25 50 75 100 125 150 VSENSE COMMON MODE VOLTAGE (V) TEMPERATURE (°C) 3892 G13 3892 G14
Maximum Current Sense Foldback Current Limit Threshold vs Duty Cycle
120 100 110 LTC3892-2 90 100 80 TAGE (mV) 90 TAGE (mV) 70 80 70 60 60 50 50 40 40 LTC3892/LTC3892-1 30 30 20 20 ILIM = INTVCC ILIM = INTVCC I I 10 LIM = FLOAT 10 LIM = FLOAT MAXIMUM CURRENT SENSE VOL ILIM = GND MAXIMUM CURRENT SENSE VOL ILIM = GND 0 0 0 100 200 300 400 500 600 700 800 0 10 20 30 40 50 60 70 80 90 100 FEEDBACK VOLTAGE (mV) DUTY CYCLE (%) 3892 G15 3892 G16
Maximum Current Sense Shutdown (RUN) Threshold Threshold vs ITH Voltage vs Temperature
100 1.4 5% DUTY CYCLE 80 1.35 PULSE-SKIPPING 1.3 60 RISING Burst Mode TAGE (mV) OPERATION 1.25 40 TAGE (V) 1.2 20 FALLING 1.15 I 0 LIM = GND ILIM = FLOAT RUN PIN VOL 1.1 I CURRENT SENSE VOL LIM = INTVCC –20 FORCED CONTINUOUS MODE 1.05 –40 1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 –75 –50 –25 0 25 50 75 100 125 150 VITH (V) TEMPERATURE (°C) 3892 G17 3892 G18 38921fc For more information www.linear.com/LTC3892 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Functional Diagrams Operation Package Description Typical Application Related Parts