Datasheet LT8697 (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation |
| Seiten / Seite | 30 / 5 — 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. VEN vs Temperature. Efficiency vs ILOAD
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LT8697
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. VEN vs Temperature Efficiency vs ILOAD Efficiency vs ILOAD
1.03 100 100 1.02 95 90 90 80 1.01 85 70 1.00 EN/UV RISING 80 60 0.99 75 50 fSW = 2MHz fSW = 2MHz 0.98 70 40 R EFFICIENCY (%) RSENSE = 18mΩ EFFICIENCY (%) SENSE = 18mΩ 65 DCRL = 20mΩ DCRL = 20mΩ EN/UV THRESHOLD (V) 30 0.97 RCBL = OPEN RCBL = OPEN EN/UV FALLING 60 V 20 IN = 8V VIN = 8V 0.96 55 VIN = 12V 10 VIN = 12V VIN = 24V VIN = 24V 0.95 50 0 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 0.001 00.01 0.1 1 10 TEMPERATURE (°C) LOAD CURRENT (A) LOAD CURRENT (A) 8697 G07 8697 G08 8697 G09
No Load Supply Current Efficiency vs Frequency No Load Supply Current vs VIN vs Temperature
100 16 10.0 fSW = 700kHz fSW = 700kHz 14 V 9.5 IN = 12V 90 12 9.0 10 80 L = 15µH 8 8.5 RSENSE = 18mΩ DCRL = 40mΩ 6 EFFICIENCY (%) RCBL = OPEN 8.0 I INPUT CURRENT (mA) 70 LOAD = 0.9A 4 VIN = 8V NO LOAD INPUT CURRENT (mA) 7.5 VIN = 12V 2 VIN = 24V 60 0 7.0 0.2 0.7 1.2 1.7 2.2 6 12 18 24 30 36 42 –55 –25 5 35 65 95 125 155 FREQUENCY (MHz) INPUT VOLTAGE (V) TEMPERATURE (°C) 8697 G10 8697 G11 8697 G12
Top FET Current Limit Top FET Current Limit Bottom FET Current Limit vs Duty Cycle vs Temperature vs Temperature
5.0 5.0 5.0 30% DC 4.5 4.6 4.6 4.0 4.2 70% DC 4.2 3.5 3.8 3.8 CURRENT LIMIT (A) CURRENT LIMIT (A) CURRENT LIMIT (A) 3.0 T 3.4 3.4 A = 155°C TA = 125°C TA = 25°C 2.5 3.0 3.0 0 0.2 0.4 0.6 0.8 1.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 8697 G13 8697 G14 8697 G15 8697fb For more information www.linear.com/LT8697 5 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. VEN vs Temperature Efficiency vs ILOAD Efficiency vs ILOAD
1.03 100 100 1.02 95 90 90 80 1.01 85 70 1.00 EN/UV RISING 80 60 0.99 75 50 fSW = 2MHz fSW = 2MHz 0.98 70 40 R EFFICIENCY (%) RSENSE = 18mΩ EFFICIENCY (%) SENSE = 18mΩ 65 DCRL = 20mΩ DCRL = 20mΩ EN/UV THRESHOLD (V) 30 0.97 RCBL = OPEN RCBL = OPEN EN/UV FALLING 60 V 20 IN = 8V VIN = 8V 0.96 55 VIN = 12V 10 VIN = 12V VIN = 24V VIN = 24V 0.95 50 0 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 0.001 00.01 0.1 1 10 TEMPERATURE (°C) LOAD CURRENT (A) LOAD CURRENT (A) 8697 G07 8697 G08 8697 G09
No Load Supply Current Efficiency vs Frequency No Load Supply Current vs VIN vs Temperature
100 16 10.0 fSW = 700kHz fSW = 700kHz 14 V 9.5 IN = 12V 90 12 9.0 10 80 L = 15µH 8 8.5 RSENSE = 18mΩ DCRL = 40mΩ 6 EFFICIENCY (%) RCBL = OPEN 8.0 I INPUT CURRENT (mA) 70 LOAD = 0.9A 4 VIN = 8V NO LOAD INPUT CURRENT (mA) 7.5 VIN = 12V 2 VIN = 24V 60 0 7.0 0.2 0.7 1.2 1.7 2.2 6 12 18 24 30 36 42 –55 –25 5 35 65 95 125 155 FREQUENCY (MHz) INPUT VOLTAGE (V) TEMPERATURE (°C) 8697 G10 8697 G11 8697 G12
Top FET Current Limit Top FET Current Limit Bottom FET Current Limit vs Duty Cycle vs Temperature vs Temperature
5.0 5.0 5.0 30% DC 4.5 4.6 4.6 4.0 4.2 70% DC 4.2 3.5 3.8 3.8 CURRENT LIMIT (A) CURRENT LIMIT (A) CURRENT LIMIT (A) 3.0 T 3.4 3.4 A = 155°C TA = 125°C TA = 25°C 2.5 3.0 3.0 0 0.2 0.4 0.6 0.8 1.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 8697 G13 8697 G14 8697 G15 8697fb For more information www.linear.com/LT8697 5 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