Datasheet LTC3780 (Analog Devices) - 8

LTC3780
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Oscillator Frequency Undervoltage Reset Minimum Current Sense vs Temperature vs Temperature Threshold vs Duty Factor (Buck)
450 4.2 –20 400 VPLLFLTR = 2.4V 4.0 350 VPLLFLTR = 1.2V 300 3.8 –40 250 VPLLFLTR = 0V 3.6 + (mV) 200 I SENSE FREQUENCY (kHz) 150 3.4 –60 100 UNDERVOLTAGE RESET (V) 3.2 50 0 3.0 –80 –75 –50 –25 0 25 50 75 100 125 –75 –50 –25 0 25 50 75 100 125 100 80 60 40 20 0 TEMPERATURE (°C) TEMPERATURE (°C) DUTY FACTOR (%) 3780 G19 3780 G20 3780 G21
Maximum Current Sense Maximum Current Sense Minimum Current Sense Threshold vs Duty Factor (Boost) Threshold vs Duty Factor (Buck) Threshold vs Temperature
180 140 200 BOOST 150 160 100 130 50 + (mV) 140 + (mV) + THRESHOLD (mV) 0 I SENSE I SNESE SNESE 120 –50 120 –100 BUCK MAXIMUM I 100 110 –150 0 20 40 60 80 100 0 20 40 60 80 100 –75 –50 –25 0 25 50 75 100 125 DUTY FACTOR (%) DUTY FACTOR (%) TEMPERATURE (°C) 3780 G22 3780 G23 3780 G24
Peak Current Threshold Valley Current Threshold vs VITH (Boost) vs VITH (Buck) Current Foldback Limit
200 100 200 150 BOOST 50 160 100 BUCK 0 120 + (mV) 50 + (mV) + (mV) I SENSE I SENSE –50 I SENSE 80 0 –50 –100 40 –100 –150 0 0 0.4 0.8 1.2 1.6 1.8 2.4 0 0.4 0.8 1.2 1.6 2.0 2.4 0 0.2 0.4 0.6 0.8 VITH (V) VITH (V) VOSENSE (V) 3780 G32 3780 G25 3780 G26 Rev G 8 For more information www.analog.com Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Applications Information Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts