Datasheet LTC7871 (Analog Devices) - 9

LTC7871
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. FREQ Pin Source Current Quiescent Current vs Temperature Quiescent Current vs T Shutdown Current vs Temperature Shutdown Current vs T vs Temperature vs T
13.0 60.0 21.5 VHIGH = 48V VHIGH = 48V 12.0 21.0 50.0 11.0 20.5 10.0 40.0 20.0 9.0 19.5 QUIESCENT CURRENT (mA) 30.0 SHUTDOWN CURRENT (µA) FREQ PIN CURRENT (µA) 8.0 19.0 7.0 20.0 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) 7871 G10 7871 G11 7871 G12
Maximum Current Sense SETCUR Pin Source Current Current Sense Threshold Threshold vs Feedback Voltage— vs Temperature vs T vs ITH Voltage (DCR) BUCK (DCR)
17.0 50 70 GND GND 16.8 40 1/4 V5 1/4 V5 FLOAT 60 16.6 30 FLOAT 3/4 V5 3/4 V5 16.4 20 V5 50 V5 16.2 10 40 16.0 0 15.8 –10 30 15.6 –20 20 SETCUR PIN CURRENT (µA) 15.4 –30 MAX CURRENT SENSE (mV) 10 15.2 CURRENT SENSE THRESHOLD (mV) –40 15.0 –50 0 –45 –20 5 30 55 80 105 130 155 0 0.5 1 1.5 2 0 0.2 0.4 0.6 0.8 1.0 1.2 TEMPERATURE (°C) ITH VOLTAGE (V) FEEDBACK VOLTAGE (V) 7871 G13 7871 G14 7871 G15
Maximum Current Sense Current Sense Threshold Threshold vs Feedback Voltage— Overcurrent Fault Threshold vs ITH Voltage vs ITH V —(R oltage (R SENSE) BUCK (R SENSE) SENSE) SENSE vs T T emperature emperature
70 80 100 GND GND 1/4 V5 1/4 V5 50 70 FLOAT FLOAT 3/4 V5 3/4 V5 80 60 30 V5 V5 50 10 60 40 T THRESHOLD (mV) –10 AUL 30 40 –30 20 GND MAX CURRENT SENSE (mV) 1/4 V5 20 CURRENT SENSE THRESHOLD (mV) –50 FLOAT 10 3/4 V5 OVERCURRENT F V5 –70 0 0 0 0.5 1 1.5 2 0 0.2 0.4 0.6 0.8 1.0 1.2 –45 –20 5 30 55 80 105 130 155 ITH VOLTAGE (V) FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 7871 G16 7871 G17 7871 G18 Rev. 0 For more information www.analog.com 9 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 Serial Port Serial Port Register Details Typical Applications Package Description Typical Application Related Parts