Datasheet LTC7802 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| Pages / Page | 34 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold. SENSE1,2– … |
| File Format / Size | PDF / 3.1 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold. SENSE1,2– Input Current. SENSE1,2+ Input Current. vs ITH Voltage
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LTC7802
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold SENSE1,2– Input Current SENSE1,2+ Input Current vs ITH Voltage vs VSENSE SENSE Voltage Current vs Voltage vs VSENSE Voltage
50 900 PULSE–SKIPPING 1.0 MODE = INTVCC MODE = INTVCC 40 Burst Mode OPERATION 800 0.8 FORCED CONTINUOUS SENSE1– CURRENT 30 700 0.6 0.4 20 600 SENSE2– CURRENT 0.2 500 10 0.0 400 0 – CURRENT (μA) + CURRENT (μA) –0.2 300 –10 SENSE –0.4 SENSE 200 –0.6 CURRENT SENSE THRESHOLD (mV) –20 100 –0.8 –30 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 –1.0 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 ITH VOLTAGE (V) 7802 G10 SENSE– VOLTAGE (V) SENSE+ VOLTAGE (V) 7802 G11 7802 G12
SENSE1,2– Input Current SENSE1,2+ Input Current Foldback Current Limit vs Temperature SENSE Current vs Temperature vs Temperature SENSE Current vs Temperature
70 900 1.0 MODE = INTVCC MODE = INTVCC 800 0.8 60 SENSE1,2– = INTVCC+0.5V 700 0.6 50 600 SENSE+ = 12V 0.4 40 500 0.2 SENSE+ = 3.3V 400 0.0 30 – CURRENT (µA) SENSE+ = 1V 300 + CURRENT (µA) –0.2 20 200 SENSE –0.4 SENSE SENSE+ = 0V 100 SENSE1– = INTVCC–0.5V –0.6 10 0 –0.8 SENSE2– = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) CC–0.5V 0 –100 –1.0 0 100 200 300 400 500 600 700 800 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FEEDBACK VOLTAGE (mV) TEMPERATURE (°C) TEMPERATURE (°C) 7802 G13 7802 G14 7802 G15
Maximum Current Sense Oscillator Frequency RUN Pin Thresholds vs Threshold vs SENSE– Voltage vs Temperature Temperature vs Temperature
70 10 1.26 RFREQ = 374k (100kHz) 1.24 60 8 RFREQ = 75k (500kHz) RFREQ = 12.5k (3MHz) 1.22 6 FREQ = GND (350kHz) 50 RISING FREQ =INTVCC (2.25MHz) 1.20 4 40 1.18 2 1.16 30 0 1.14 20 1.12 –2 FALLING RUN PIN THRESHOLD (V) CHANGE IN FREQUENCY (%) 1.10 10 –4 1.08 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –6 1.06 0 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 SENSE– VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 7802 G16 7802 G17 7802 G18 Rev. 0 For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold SENSE1,2– Input Current SENSE1,2+ Input Current vs ITH Voltage vs VSENSE SENSE Voltage Current vs Voltage vs VSENSE Voltage
50 900 PULSE–SKIPPING 1.0 MODE = INTVCC MODE = INTVCC 40 Burst Mode OPERATION 800 0.8 FORCED CONTINUOUS SENSE1– CURRENT 30 700 0.6 0.4 20 600 SENSE2– CURRENT 0.2 500 10 0.0 400 0 – CURRENT (μA) + CURRENT (μA) –0.2 300 –10 SENSE –0.4 SENSE 200 –0.6 CURRENT SENSE THRESHOLD (mV) –20 100 –0.8 –30 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 –1.0 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 ITH VOLTAGE (V) 7802 G10 SENSE– VOLTAGE (V) SENSE+ VOLTAGE (V) 7802 G11 7802 G12
SENSE1,2– Input Current SENSE1,2+ Input Current Foldback Current Limit vs Temperature SENSE Current vs Temperature vs Temperature SENSE Current vs Temperature
70 900 1.0 MODE = INTVCC MODE = INTVCC 800 0.8 60 SENSE1,2– = INTVCC+0.5V 700 0.6 50 600 SENSE+ = 12V 0.4 40 500 0.2 SENSE+ = 3.3V 400 0.0 30 – CURRENT (µA) SENSE+ = 1V 300 + CURRENT (µA) –0.2 20 200 SENSE –0.4 SENSE SENSE+ = 0V 100 SENSE1– = INTVCC–0.5V –0.6 10 0 –0.8 SENSE2– = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) CC–0.5V 0 –100 –1.0 0 100 200 300 400 500 600 700 800 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FEEDBACK VOLTAGE (mV) TEMPERATURE (°C) TEMPERATURE (°C) 7802 G13 7802 G14 7802 G15
Maximum Current Sense Oscillator Frequency RUN Pin Thresholds vs Threshold vs SENSE– Voltage vs Temperature Temperature vs Temperature
70 10 1.26 RFREQ = 374k (100kHz) 1.24 60 8 RFREQ = 75k (500kHz) RFREQ = 12.5k (3MHz) 1.22 6 FREQ = GND (350kHz) 50 RISING FREQ =INTVCC (2.25MHz) 1.20 4 40 1.18 2 1.16 30 0 1.14 20 1.12 –2 FALLING RUN PIN THRESHOLD (V) CHANGE IN FREQUENCY (%) 1.10 10 –4 1.08 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –6 1.06 0 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 SENSE– VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 7802 G16 7802 G17 7802 G18 Rev. 0 For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
