Datasheet LTC3865, LTC3865-1 (Analog Devices) - 7

LTC3865/LTC3865-1
TYPICAL PERFORMANCE CHARACTERISTICS Tracking Up and Down with External Ramp Quiescent Current vs Input (Forced Continuous Mode) Voltage without EXTVCC INTVCC Line Regulation
5 5.25 TK/SS1 5.00 TK/SS2 4 2V/DIV 4.75 4.50 VOUT1 = 1.5V 3 1Ω LOAD 4.25 500mV/DIV VOLTAGE (V) 4.00 2 CC VOUT2 = 1.2V 1Ω LOAD 3.75 INTV 500mV/DIV QUIESCENT CURRENT (mA) 1 3.50 20ms/DIV 3865 G07 3.25 0 3.00 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3865 G08 3865 G09
Maximum Current Sense Current Sense Threshold Threshold vs Common Mode Maximum Current Sense vs ITH Voltage Voltage Threshold vs Duty Cycle
80 80 100 ILIM = INTVCC ILIM = INTVCC 90 60 70 80 I I LIM = INTVCC LIM = FLOAT 60 40 I 70 LIM = FLOAT 50 60 (mV) ILIM = FLOAT 20 40 50 SENSE I V I LIM = GND LIM = GND 30 40 0 ILIM = GND 30 20 –20 20 CURRENT SENSE THRESHOLD (mV) 10 CURRENT SENSE THRESHOLD (mV) 10 –40 0 0 0 0.5 1 1.5 2 0 1 2 3 4 5 0 20 40 60 80 100 VITH (V) VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 3865 G10 3865 G12 3865 G11
Maximum Current Sense Voltage vs Feedback Voltage TK/SS Pull-Up Current (Current Foldback) vs Temperature
100 2.00 90 1.75 80 ILIM = INTVCC 1.50 70 1.25 60 ILIM = FLOAT 50 1.00 40 I 0.75 LIM = GND 30 TK/SS CURRENT (μA) 0.50 20 0.25 10 MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 –50 –25 0 25 50 75 100 125 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 3865 G13 3865 G14 3865fb 7