Datasheet LT8697 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation |
| Seiten / Seite | 30 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 502 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum On-Time. Switch Drop vs Temperature
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LT8697
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum On-Time Switch Drop vs Temperature Switch Drop vs ISW vs Temperature
250 350 100 SWITCH CURRENT = 1A 300 90 200 250 80 150 TOP SW ILOAD = 0A 200 70 TOP SW 100 150 60 BOTTOM SW I SWITCH DROP (mV) SWITCH DROP (mV) LOAD = 0.9A 100 50 MINIMUM ON-TIME (ns) 50 BOTTOM SW 50 40 ILOAD = 2.1A 0 0 30 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8697 G16 8697 G17 8697 G18
Minimum Off-Time Minimum Off-Time vs Temperature vs Temperature Dropout Voltage vs ILOAD
120 100 600 RT = 30.1k RT = 30.1k DCRL = 20mΩ 115 SYNC = 3V 95 SYNC = 1.2MHz R 500 SENSE = 18mΩ 110 90 105 400 85 I 100 LOAD = 2.1A I 80 300 LOAD = 2.1A 95 75 I 90 LOAD = 0.9A 200 ILOAD = 0.9A MINIMUM OFF-TIME (ns) MINIMUM OFF-TIME (ns) 70 DROPOUT VOLTAGE (mV) 85 ILOAD = 0A 100 80 ILOAD = 0A 65 75 60 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8697 G19 8697 G20 8697 G21
Switching Frequency vs Temperature Switching Frequency vs ILOAD Switching Frequency vs VSYS
2.20 2100 2500 R RT = 16.5k RT = 16.5k T = 16.5k 2.15 2000 2.10 2050 2.05 1500 2.00 2000 1000 1.95 1.90 1950 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 500 SWITCHING FREQUENCY (MHz) 1.85 1.80 1900 0 –55 –25 5 35 65 95 125 155 0.0001 0.001 0.01 0.1 1 10 0 1 2 3 4 5 TEMPERATURE (°C) LOAD CURRENT (A) VSYS (V) 8697 G23 8697 G24 8697 G22 8697fb 6 For more information www.linear.com/LT8697 Document Outline Features Applications Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum On-Time Switch Drop vs Temperature Switch Drop vs ISW vs Temperature
250 350 100 SWITCH CURRENT = 1A 300 90 200 250 80 150 TOP SW ILOAD = 0A 200 70 TOP SW 100 150 60 BOTTOM SW I SWITCH DROP (mV) SWITCH DROP (mV) LOAD = 0.9A 100 50 MINIMUM ON-TIME (ns) 50 BOTTOM SW 50 40 ILOAD = 2.1A 0 0 30 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8697 G16 8697 G17 8697 G18
Minimum Off-Time Minimum Off-Time vs Temperature vs Temperature Dropout Voltage vs ILOAD
120 100 600 RT = 30.1k RT = 30.1k DCRL = 20mΩ 115 SYNC = 3V 95 SYNC = 1.2MHz R 500 SENSE = 18mΩ 110 90 105 400 85 I 100 LOAD = 2.1A I 80 300 LOAD = 2.1A 95 75 I 90 LOAD = 0.9A 200 ILOAD = 0.9A MINIMUM OFF-TIME (ns) MINIMUM OFF-TIME (ns) 70 DROPOUT VOLTAGE (mV) 85 ILOAD = 0A 100 80 ILOAD = 0A 65 75 60 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8697 G19 8697 G20 8697 G21
Switching Frequency vs Temperature Switching Frequency vs ILOAD Switching Frequency vs VSYS
2.20 2100 2500 R RT = 16.5k RT = 16.5k T = 16.5k 2.15 2000 2.10 2050 2.05 1500 2.00 2000 1000 1.95 1.90 1950 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 500 SWITCHING FREQUENCY (MHz) 1.85 1.80 1900 0 –55 –25 5 35 65 95 125 155 0.0001 0.001 0.01 0.1 1 10 0 1 2 3 4 5 TEMPERATURE (°C) LOAD CURRENT (A) VSYS (V) 8697 G23 8697 G24 8697 G22 8697fb 6 For more information www.linear.com/LT8697 Document Outline Features Applications Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts