Datasheet LTC3890-1 (Analog Devices) - 6

LTC3890-1
TYPICAL PERFORMANCE CHARACTERISTICS Total Input Supply Current EXTVCC Switchover and INTVCC vs Input Voltage Voltages vs Temperature INTVCC Line Regulation
300 6.0 5.5 VOUT = 3.3V FIGURE 13 CIRCUIT 5.8 250 5.6 5.0 5.4 200 300µA LOAD VOLTAGE (V) 5.2 INTVCC 4.5 CC TAGE (V) 150 5.0 EXTVCC RISING VOL Y CURRENT (µA) 4.8 V CC 4.0 100 AND INTV 4.6 EXTV SUPPL CC FALLING INT NO LOAD CC 4.4 3.5 50 EXTV 4.2 ILOAD = 10mA 0 4.0 3.0 5 10 15 20 25 30 35 40 45 50 55 60 65 –75 –50 –25 0 25 50 75 100 125 150 0 5 10 15 20 25 30 35 40 45 50 55 60 65 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 38901 G10 38901 G12 38901 G11
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pin Input Bias Current Threshold vs Duty Cycle
80 800 90 5% DUTY CYCLE 700 60 85 600 PULSE-SKIPPING MODE TAGE (mV) 40 500 80 Burst Mode OPERATION 400 20 75 300 – CURRENT (µA) 0 200 70 SENSE 100 CURRENT SENSE THESHOLD (mV) –20 65 0 FORCED CONTINUOUS MODE MAXIMUM CURRENT SENSE VOL –40 –100 60 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 (%) 38901 G13 38901 G14 38901 G15
Foldback Current Limit Quiescent Current vs Temperature INTVCC vs Load Current
80 80 5.50 VIN = 12V VIN = 12V 75 70 5.25 70 EXTVCC = 0V TAGE (mV) 60 65 5.00 EXTVCC = 8.5V 50 60 40 55 4.75 VOLTAGE (V) 50 CC 30 4.50 EXTV 45 INTV CC = 5V 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) 38901 G16 38901 G17 38901 G18 38901fb 6 Document Outline Features Description Applications 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