Datasheet LTC3871, LTC3871-1 (Analog Devices) - 7

LTC3871/LTC3871-1
TYPICAL PERFORMANCE CHARACTERISTICS FREQ Pin Source Current Quiescent Current vs Temperature Shutdown Current vs Temperature vs Temperature vs T
10.0 200 21.5 VHIGH = 50V VHIGH = 50V 21.0 9.0 180 μA) μA) 20.5 8.0 160 20.0 7.0 140 19.5 FREQ PIN CURRENT ( QUIESCENT CURRENT (mA) 6.0 SHUTDOWN CURRENT ( 120 19.0 5.0 100 18.5 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3871 G10 3871 G11 3871 G12
Maximum Current Sense Threshold Current Sense Threshold vs Maximum Current Sense Threshold vs Feedback Voltage (DCR) ITH Voltage (DCR) vs Duty Cycle – BUCK (DCR) vs Duty Cycle (BUCK Mode) (LTC3871)
50 70.0 60.0 GND 40 1/4 V5 60.0 50.0 30 FLOAT V5 3/4 V5 20 50.0 V5 V5 40.0 10 3/4 V5 40.0 0 3/4 V5 30.0 FLOAT –10 30.0 FLOAT 20.0 –20 20.0 1/4 V5 –30 MAX CURRENT SENSE (mV) 1/4 V5 MAX CURRENT SENSE (mV) 10.0 CURRENT SENSE THRESHOLD (mV) 10.0 –40 GND GND –50 0 0 0 0.5 1 1.5 2 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.5 0.7 1.0 1.2 ITH VOLTAGE (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3871 G13 3871 G14 3871 G15
Maximum Current Sense Threshold Current Sense Threshold vs Maximum Current Sense Threshold vs Feedback Voltage (RSENSE) ITH V ITH Voltage (RSENSE) oltage (RSENSE) vs Duty Cycle – BUCK (RSENSE) vs Duty Cycle (BUCK) (RSENSE) (LTC3871)
70 80.0 70.0 GND 1/4 V5 50 70.0 60.0 FLOAT V5 3/4 V5 60.0 30 V5 V5 50.0 3/4 V5 50.0 10 3/4 V5 40.0 40.0 FLOAT –10 FLOAT 30.0 30.0 1/4 V5 –30 20.0 20.0 1/4 V5 MAX CURRENT SENSE (mV) MAX CURRENT SENSE (mV) CURRENT SENSE THRESHOLD (mV) –50 10.0 10.0 GND GND –70 0 0 0 0.5 1 1.5 2 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.5 0.7 1.0 1.2 ITH VOLTAGE (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3871 G16 3871 G17 3871 G18 Rev. B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts