Datasheet LT8648S (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 42V, 15A Synchronous Step-Down Silent Switcher 2 |
| Pages / Page | 28 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency. … |
| File Format / Size | PDF / 2.2 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency. Efficiency. 12VIN to 3.3VOUT Efficiency. vs Frequency
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Text Version of Document
LT8648S
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency Efficiency 12VIN to 3.3VOUT Efficiency Efficiency vs Frequency vs Frequency Efficiency at 5VOUT out
100 8 100 8 100 8 FC MODE FC MODE FC MODE 95 7 95 7 95 7 90 EFFICIENCY 6 90 6 6 POWER LOSS (W) 90 EFFICIENCY POWER LOSS (W) POWER LOSS (W) 85 5 85 5 85 5 80 4 80 4 80 4 POWER LOSS POWER LOSS 75 3 EFFICIENCY (%) 75 3 EFFICIENCY (%) 75 3 EFFICIENCY (%) 70 L = XAL8080 2 70 L = XAL8080 2 70 VIN = 12V 2 400kHz, L = 2.2µH 400kHz, L = 2.2uH VIN = 24V 65 1MHz, L = 1µH 1 65 1MHz, L = 1uH 1 65 VIN = 36V 1 2MHz, L = 0.68µH 2MHz, L = 0.68uH f 60 0 60 0 SW = 400kHz, L = XAL8080, 2.2µH 60 0 1 3 5 7 9 11 13 15 1 3 5 7 9 11 13 15 1 3 5 7 9 11 13 15 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8648S G01 8648S G02 8648S G03
Efficiency at 3.3V Efficiency at 3.3V OUT out Low Load Efficiency at 5V Low Load Efficiency at 5V OUT OUT Low Load Efficiency at 3.3V Low Load Efficiency at 3.3V OUT OUT
100 8 100 100 FC MODE 95 7 90 90 90 6 80 80 POWER LOSS (W) 70 70 85 5 60 60 80 4 50 50 75 3 EFFICIENCY (%) V EFFICIENCY (%) IN = 12V V 40 IN = 12V EFFICIENCY (%) V 40 IN = 24V VIN = 24V 70 V V IN = 12V 2 V 30 IN = 36V IN = 36V 30 VIN = 24V f f 65 SW = 400kHz V SW = 400kHz IN = 36V 1 20 L = XAL8080, 2.2uH 20 L = XAL8080, 2.2µH fSW = 400kHz, L = XAL8080, 2.2µH Burst Mode Operation Burst Mode Operation 60 0 10 10 1 3 5 7 9 11 13 15 0.1 1 10 100 1000 10000 0.1 1 10 100 1000 10000 LOAD CURRENT (A) LOAD CURRENT (mA) LOAD CURRENT (mA) 8648S G04 8648S G05 8648S G06
Efficiency vs Frequency Efficiency vs Frequency Reference Voltage oltage EN Pin Thresholds
96 609 1.00 607 94 0.99 605 92 0.98 603 EN RISING 90 0.97 TAGE (mV) 601 88 0.96 599 86 EFFICIENCY (%) 0.95 597 EN THRESHOLD (V) 84 VIN = 12V REFERENCE VOL 595 0.94 VOUT = 3.3V EN FALLING 82 ILOAD = 5A 593 0.93 L = XAL8080, 2.2µH 80 591 0.92 0.2 0.6 1 1.4 1.8 2.2 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) TEMPERATURE (°C) 8648S G07 8648S G08 8648S G09 Rev. 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency Efficiency 12VIN to 3.3VOUT Efficiency Efficiency vs Frequency vs Frequency Efficiency at 5VOUT out
100 8 100 8 100 8 FC MODE FC MODE FC MODE 95 7 95 7 95 7 90 EFFICIENCY 6 90 6 6 POWER LOSS (W) 90 EFFICIENCY POWER LOSS (W) POWER LOSS (W) 85 5 85 5 85 5 80 4 80 4 80 4 POWER LOSS POWER LOSS 75 3 EFFICIENCY (%) 75 3 EFFICIENCY (%) 75 3 EFFICIENCY (%) 70 L = XAL8080 2 70 L = XAL8080 2 70 VIN = 12V 2 400kHz, L = 2.2µH 400kHz, L = 2.2uH VIN = 24V 65 1MHz, L = 1µH 1 65 1MHz, L = 1uH 1 65 VIN = 36V 1 2MHz, L = 0.68µH 2MHz, L = 0.68uH f 60 0 60 0 SW = 400kHz, L = XAL8080, 2.2µH 60 0 1 3 5 7 9 11 13 15 1 3 5 7 9 11 13 15 1 3 5 7 9 11 13 15 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8648S G01 8648S G02 8648S G03
Efficiency at 3.3V Efficiency at 3.3V OUT out Low Load Efficiency at 5V Low Load Efficiency at 5V OUT OUT Low Load Efficiency at 3.3V Low Load Efficiency at 3.3V OUT OUT
100 8 100 100 FC MODE 95 7 90 90 90 6 80 80 POWER LOSS (W) 70 70 85 5 60 60 80 4 50 50 75 3 EFFICIENCY (%) V EFFICIENCY (%) IN = 12V V 40 IN = 12V EFFICIENCY (%) V 40 IN = 24V VIN = 24V 70 V V IN = 12V 2 V 30 IN = 36V IN = 36V 30 VIN = 24V f f 65 SW = 400kHz V SW = 400kHz IN = 36V 1 20 L = XAL8080, 2.2uH 20 L = XAL8080, 2.2µH fSW = 400kHz, L = XAL8080, 2.2µH Burst Mode Operation Burst Mode Operation 60 0 10 10 1 3 5 7 9 11 13 15 0.1 1 10 100 1000 10000 0.1 1 10 100 1000 10000 LOAD CURRENT (A) LOAD CURRENT (mA) LOAD CURRENT (mA) 8648S G04 8648S G05 8648S G06
Efficiency vs Frequency Efficiency vs Frequency Reference Voltage oltage EN Pin Thresholds
96 609 1.00 607 94 0.99 605 92 0.98 603 EN RISING 90 0.97 TAGE (mV) 601 88 0.96 599 86 EFFICIENCY (%) 0.95 597 EN THRESHOLD (V) 84 VIN = 12V REFERENCE VOL 595 0.94 VOUT = 3.3V EN FALLING 82 ILOAD = 5A 593 0.93 L = XAL8080, 2.2µH 80 591 0.92 0.2 0.6 1 1.4 1.8 2.2 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) TEMPERATURE (°C) 8648S G07 8648S G08 8648S G09 Rev. 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Applications Related Parts
