Datasheet LT8648S (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 42V, 15A Synchronous Step-Down Silent Switcher 2 |
| Pages / Page | 28 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Load Regulation. Line Regulation. … |
| File Format / Size | PDF / 2.2 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Load Regulation. Line Regulation. No-Load Supply Current. No–Load Supply Current
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LT8648S
TYPICAL PERFORMANCE CHARACTERISTICS Load Regulation Line Regulation No-Load Supply Current No–Load Supply Current
1.00 0.10 200 VOUT = 5V VOUT = 5V V 0.75 IN = 12V 0.08 L = 1µH 175 0.06 Burst Mode OPERATION 0.50 IN REGULATION 0.04 (%) 150 0.25 (%) OUT 0.02 OUT 0 0.00 125 –0.25 –0.02 100 CHANGE IN V CHANGE IN V –0.04 INPUT CURRENT (µA) –0.50 –0.06 VOUT = 5V 75 –0.75 FORCED CONTINUOUS MODE I –0.08 LOAD = 1A Burst Mode OPERATION FC MODE –1.00 –0.10 50 0 3 6 9 12 15 5 10 15 20 25 30 35 40 5 10 15 20 25 30 35 40 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8648S G10 8648S G11 8648S G12
Top FET Current Limit vs Top FET Current Limit vs Top FET Current Limit vs Duty Cycle Top FET Current Limit vs Duty Cycle Temperature T Switch RDS(ON) Switch R vs Temperature DS(ON) vs T
31 33 24 30 32 21 29 31 18 28 27 30 15 5% DC TOP SWITCH (mΩ) 26 29 12 25 28 R DS(ON) 9 CURRENT LIMIT (A) 24 CURRENT LIMIT (A) 27 6 23 22 26 3 BOTTOM SWITCH 21 25 0 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 DUTY CYCLE TEMPERATURE (°C) TEMPERATURE (°C) 8648S G13 8648S G14 8648S G15
Dropout Voltage Dropout V Minimum On-Time Minimum On-T Switching Frequency
400 45 1.04 VIN = 5V Burst Mode OPERATION RT = 38.3k V 350 OUT SET TO REGULATE AT 5V FORCED CONTINUOUS MODE 1.03 L = XAL8080, 1µH 40 300 1.02 35 250 1.01 TAGE (mV) 200 30 1.00 150 0.99 25 DROPOUT VOL 100 MINIMUM ON-TIME (ns) 0.98 20 ILOAD = 5A SWITCHING FREQUENCY (MHz) 50 V 0.97 OUT = 0.6V fSW = 3MHz 0 15 0.96 0 3 6 9 12 15 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 8648S G16 8648S G17 8648S G18 Rev. 0 6 For more information www.analog.com 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 Load Regulation Line Regulation No-Load Supply Current No–Load Supply Current
1.00 0.10 200 VOUT = 5V VOUT = 5V V 0.75 IN = 12V 0.08 L = 1µH 175 0.06 Burst Mode OPERATION 0.50 IN REGULATION 0.04 (%) 150 0.25 (%) OUT 0.02 OUT 0 0.00 125 –0.25 –0.02 100 CHANGE IN V CHANGE IN V –0.04 INPUT CURRENT (µA) –0.50 –0.06 VOUT = 5V 75 –0.75 FORCED CONTINUOUS MODE I –0.08 LOAD = 1A Burst Mode OPERATION FC MODE –1.00 –0.10 50 0 3 6 9 12 15 5 10 15 20 25 30 35 40 5 10 15 20 25 30 35 40 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8648S G10 8648S G11 8648S G12
Top FET Current Limit vs Top FET Current Limit vs Top FET Current Limit vs Duty Cycle Top FET Current Limit vs Duty Cycle Temperature T Switch RDS(ON) Switch R vs Temperature DS(ON) vs T
31 33 24 30 32 21 29 31 18 28 27 30 15 5% DC TOP SWITCH (mΩ) 26 29 12 25 28 R DS(ON) 9 CURRENT LIMIT (A) 24 CURRENT LIMIT (A) 27 6 23 22 26 3 BOTTOM SWITCH 21 25 0 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 DUTY CYCLE TEMPERATURE (°C) TEMPERATURE (°C) 8648S G13 8648S G14 8648S G15
Dropout Voltage Dropout V Minimum On-Time Minimum On-T Switching Frequency
400 45 1.04 VIN = 5V Burst Mode OPERATION RT = 38.3k V 350 OUT SET TO REGULATE AT 5V FORCED CONTINUOUS MODE 1.03 L = XAL8080, 1µH 40 300 1.02 35 250 1.01 TAGE (mV) 200 30 1.00 150 0.99 25 DROPOUT VOL 100 MINIMUM ON-TIME (ns) 0.98 20 ILOAD = 5A SWITCHING FREQUENCY (MHz) 50 V 0.97 OUT = 0.6V fSW = 3MHz 0 15 0.96 0 3 6 9 12 15 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 8648S G16 8648S G17 8648S G18 Rev. 0 6 For more information www.analog.com 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
