Datasheet LTC3891 (Analog Devices) - 7

LTC3891
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pin Input Bias Current Threshold vs Duty Cycle
80 800 80 5% DUTY CYCLE 700 60 70 ILIM = FLOAT PULSE-SKIPPING MODE 600 TAGE (mV) 40 Burst Mode 500 60 OPERATION 400 I 20 50 LIM = INTVCC 300 I – CURRENT (µA) LIM = GND 0 200 40 ILIM = INTVCC SENSE 100 I I LIM = GND CURRENT SENSE THESHOLD (mV) –20 LIM = FLOAT 30 FORCED CONTINUOUS MODE 0 MAXIMUM CURRENT SENSE VOL –40 –100 20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 0 10 20 30 40 50 60 70 80 90 100 VITH (V) VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 3891 G13 3891 G14 3891 G15
Foldback Current Limit Quiescent Current vs Temperature INTVCC vs Load Current
80 80 5.50 I V V LIM = FLOAT IN = 12V IN = 12V 70 75 5.25 70 TAGE (mV) 60 EXTVCC = 0V I 65 LIM = INTVCC 5.00 50 EXTVCC = 8.5V 60 40 55 4.75 VOLTAGE (V) 30 50 CC EXTV I 4.50 CC = 5V LIM = GND 45 INTV 20 QUIESCENT CURRENT (µA) 40 4.25 10 35 MAXIMUM CURRENT SENSE VOL 0 30 4.00 0 100 200 300 400 500 600 700 800 –75 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 FEEDBACK VOLTAGE (MV) TEMPERATURE (°C) LOAD CURRENT (mA) 3891 G16 3891 G17 3891 G18
TRACK/SS Pull-Up Current Shutdown (RUN) Threshold Regulated Feedback Voltage vs Temperature vs Temperature vs Temperature
12.0 1.30 808 11.5 806 11.0 1.25 804 10.5 RUN RISING 802 10.0 1.20 800 9.5 798 RUN FALLING TRACK/SS CURRENT (µA) 9.0 RUN PIN VOLTAGE (V) 1.15 796 8.5 REGULATED FEEDBACK VOLTAGE (mV) 794 8.0 1.10 792 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3891 G19 3891 G20 3891 G21 3891fa 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts