Datasheet LTC3875 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation |
| Pages / Page | 46 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold. Maximum … |
| File Format / Size | PDF / 997 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Current Sense Threshold. Maximum Current Sense Threshold. INTVCC Line Regulation
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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
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
