Datasheet LTC3875 (Analog Devices) - 7

LTC3875
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold Maximum Current Sense Threshold INTVCC Line Regulation vs ITH Voltage vs Common Mode Voltage
6 40 35 ILIM = 0 35 ILIM = 1/4 INTV ILIM = INTV CC CC 5 30 30 ILIM = 1/2 INTVCC ILIM = 3/4 INTVCC ILIM = 3/4 INTVCC ILIM = INTV 25 4 25 CC 20 ILIM = 1/2 INTVCC 20 3 15 VOLTAGE (V) ILIM = 1/4 INTVCC 15 CC 10 2 ILIM = GND INTV 5 10 1 0 CURRENT SENSE THRESHOLD (mV) CURRENT SENSE THRESHOLD (mV) 5 –5 0 –10 0 0 5 10 15 20 25 30 35 40 0 0.5 1 1.5 2 0 1 2 3 4 INPUT VOLTAGE (V) ITH VOLTAGE (V) VSENSE COMMON MODE VOLTAGE (V) 3875 G10 3875 G11 3875 G12
Maximum Current Sense Threshold vs Feedback Voltage TK/SS Pull-Up Current Shutdown (RUN) Threshold (Current Foldback) vs Temperature vs Temperature
35 1.40 1.30 ILIM = INTV 30 CC 1.35 1.25 ILIM = 3/4 INTV 25 CC 1.30 ON 1.20 ILIM = 1/2 INTV 1.25 20 CC ILIM = 1/4 INTV 1.20 1.15 15 CC OFF 1.15 ILIM = GND 1.10 10 TK/SS CURRENT (µA) 1.10 RUN PIN THRESHLD (V) 5 1.05 1.05 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 1.00 1.00 0 0.1 0.2 0.3 0.4 0.5 0.6 –50 –30 –10 10 30 50 70 90 110 130 –50 0 50 100 150 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3875 G13 3875 G14 4320 G01
Regulated Feedback Voltage Oscillator Frequency vs Temperature vs Temperature
0.6045 900 0.6035 V 800 FREQ = INTVCC 0.6025 700 0.6015 600 VFREQ = 1.22V 0.6005 500 0.5995 400 0.5985 FREQUENCY (kHz) 300 VFREQ = GND FEEDBACK VOLTAGE (V) 0.5975 200 0.5965 100 0.5955 0 –50 –30 –10 10 30 50 70 90 110 130 –50 0 50 100 150 TEMPERATURE (°C) TEMPERATURE (°C) 3875 G16 3875 G17 3875fb For more information www.linear.com/LTC3875 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Related Parts