Datasheet LTC7802-3.3 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| 页数 / 页 | 34 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold vs ITH. … |
| 文件格式/大小 | PDF / 1.5 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold vs ITH. SENSE1,2– Input Current. SENSE1,2+ Input Current. Voltage
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LTC7802-3.3
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold vs ITH SENSE1,2– Input Current SENSE1,2+ Input Current Voltage vs ITH Voltage vs VSENSE Voltage vs VSENSE Voltage
50 900 1.0 PULSE–SKIPPING MODE = INTVCC MODE = INTVCC 40 Burst Mode OPERATION 800 0.8 FORCED CONTINUOUS 700 0.6 30 600 0.4 20 500 0.2 10 0.0 400 – CURRENT (μA) 0 + CURRENT (μA) –0.2 300 –0.4 –10 SENSE2 200 SENSE –0.6 CURRENT SENSE THRESHOLD (mV) –20 100 –0.8 –30 0 –1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 ITH VOLTAGE (V) SENSE2– VOLTAGE (V) SENSE+ VOLTAGE (V) 780233 G10 780233 G11 780233 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 SENSE2– = INTVCC + 0.5V 700 0.6 50 SENSE+ = 12V 600 0.4 40 500 0.2 SENSE+ = 3.3V 400 0.0 30 SENSE+ = 1V – CURRENT (µA) 300 + CURRENT (µA) –0.2 20 200 –0.4 SENSE SENSE SENSE+ = 0V 100 SENSE1– = 3.3V –0.6 10 0 –0.8 SENSE2– = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 CC – 0.5V –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) 780233 G13 780233 G14 780233 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 = 12k (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) 780233 G16 780233 G17 780233 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 vs ITH SENSE1,2– Input Current SENSE1,2+ Input Current Voltage vs ITH Voltage vs VSENSE Voltage vs VSENSE Voltage
50 900 1.0 PULSE–SKIPPING MODE = INTVCC MODE = INTVCC 40 Burst Mode OPERATION 800 0.8 FORCED CONTINUOUS 700 0.6 30 600 0.4 20 500 0.2 10 0.0 400 – CURRENT (μA) 0 + CURRENT (μA) –0.2 300 –0.4 –10 SENSE2 200 SENSE –0.6 CURRENT SENSE THRESHOLD (mV) –20 100 –0.8 –30 0 –1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 ITH VOLTAGE (V) SENSE2– VOLTAGE (V) SENSE+ VOLTAGE (V) 780233 G10 780233 G11 780233 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 SENSE2– = INTVCC + 0.5V 700 0.6 50 SENSE+ = 12V 600 0.4 40 500 0.2 SENSE+ = 3.3V 400 0.0 30 SENSE+ = 1V – CURRENT (µA) 300 + CURRENT (µA) –0.2 20 200 –0.4 SENSE SENSE SENSE+ = 0V 100 SENSE1– = 3.3V –0.6 10 0 –0.8 SENSE2– = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 CC – 0.5V –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) 780233 G13 780233 G14 780233 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 = 12k (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) 780233 G16 780233 G17 780233 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