Datasheet LTC3867 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control |
| 页数 / 页 | 36 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold. Maximum … |
| 文件格式/大小 | PDF / 394 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold. Maximum Current Sense Threshold. Maximum Current Sense
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LTC3867
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold Maximum Current Sense Threshold Maximum Current Sense vs ITH Voltage vs Common Mode Voltage Threshold vs Duty Cycle
75 80 80 ILIM = INTVCC ILIM = INTVCC 60 70 ILIM = INTVCC 70 ILIM = 3.7V ILIM = 3.7V 45 I I LIM = FLOAT 60 LIM = 3.7V 60 ILIM = 1.5V I (mV) LIM = FLOAT (mV) 30 ILIM = FLOAT 50 50 SENSE 15 I V SENSE LIM = GND I I LIM = 1.5V LIM = 1.5V 40 MAX V 40 0 I ILIM = GND 30 LIM = GND –15 30 CURRENT SENSE THRESHOLD (mV) –30 20 20 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 0 2 4 6 8 10 12 14 0 10 20 30 40 50 60 70 80 90 100 I V TH VOLTAGE (V) SENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 3867 G09 3867 G10 3867 G11
Maximum Current Sense Voltage vs Feedback Voltage Shutdown (RUN) Threshold Regulated Feedback Voltage (Current Foldback) vs Temperature vs Temperature
80 1.30 0.606 70 ILIM = INTVCC 1.25 0.604 ILIM = 3.7V 60 ON 1.20 0.602 ILIM = FLOAT 50 I 1.15 0.600 LIM = 1.5V 40 V FB (V) OFF ILIM = GND 1.10 0.598 30 RUN PIN VOLTAGE (V) 20 1.05 0.596 MAXIMUM CURRENT SENSE VOLTAGE (mV) 10 1.00 0.594 0 100 200 300 400 500 600 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3867 G12 3867 G14 3867 G15
UVLO Threshold (INTVCC) Oscillator Frequency Oscillator Frequency vs Temperature vs Temperature vs Input Voltage
4.25 660 620 615 4.00 640 RISING 610 620 3.75 605 600 600 3.50 595 FREQUENCY (kHz) 580 FREQUENCY (kHz) UVLO THRESHOLD (V) FALLING 590 3.25 560 585 3.00 540 580 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 3867 G16 3867 G17 3867 G18 3867f 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Current Sense Threshold Maximum Current Sense Threshold Maximum Current Sense vs ITH Voltage vs Common Mode Voltage Threshold vs Duty Cycle
75 80 80 ILIM = INTVCC ILIM = INTVCC 60 70 ILIM = INTVCC 70 ILIM = 3.7V ILIM = 3.7V 45 I I LIM = FLOAT 60 LIM = 3.7V 60 ILIM = 1.5V I (mV) LIM = FLOAT (mV) 30 ILIM = FLOAT 50 50 SENSE 15 I V SENSE LIM = GND I I LIM = 1.5V LIM = 1.5V 40 MAX V 40 0 I ILIM = GND 30 LIM = GND –15 30 CURRENT SENSE THRESHOLD (mV) –30 20 20 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 0 2 4 6 8 10 12 14 0 10 20 30 40 50 60 70 80 90 100 I V TH VOLTAGE (V) SENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 3867 G09 3867 G10 3867 G11
Maximum Current Sense Voltage vs Feedback Voltage Shutdown (RUN) Threshold Regulated Feedback Voltage (Current Foldback) vs Temperature vs Temperature
80 1.30 0.606 70 ILIM = INTVCC 1.25 0.604 ILIM = 3.7V 60 ON 1.20 0.602 ILIM = FLOAT 50 I 1.15 0.600 LIM = 1.5V 40 V FB (V) OFF ILIM = GND 1.10 0.598 30 RUN PIN VOLTAGE (V) 20 1.05 0.596 MAXIMUM CURRENT SENSE VOLTAGE (mV) 10 1.00 0.594 0 100 200 300 400 500 600 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3867 G12 3867 G14 3867 G15
UVLO Threshold (INTVCC) Oscillator Frequency Oscillator Frequency vs Temperature vs Temperature vs Input Voltage
4.25 660 620 615 4.00 640 RISING 610 620 3.75 605 600 600 3.50 595 FREQUENCY (kHz) 580 FREQUENCY (kHz) UVLO THRESHOLD (V) FALLING 590 3.25 560 585 3.00 540 580 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 3867 G16 3867 G17 3867 G18 3867f 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts