Datasheet LT8650S (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| 页数 / 页 | 32 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Top FET Current Limit. Bottom FET … |
| 修订版 | B |
| 文件格式/大小 | PDF / 3.3 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Top FET Current Limit. Bottom FET Current Limit. Switch VDS. Minimum On-Time
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LT8650S
TYPICAL PERFORMANCE CHARACTERISTICS Top FET Current Limit Bottom FET Current Limit Switch VDS
16 11 500 30% DC 10 450 14 9 400 12 8 350 10 7 (mV) 300 DS 6 250 8 5 200 CURRENT LIMIT (A) SWITCH V 6 CURRENT LIMIT (A) 4 150 3 100 4 2 50 TOP FET BOT FET 2 1 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 TEMPERATURE (°C) TEMPERATURE (°C) IDS (A) 8650S G14 8650S G15 8650S G16
Minimum On-Time Minimum Off-Time Dropout Voltage
80 60 1000 FCM, 2A LOAD FCM, 1A LOAD fSW = 2MHz 59 900 70 VOUT = 3V 58 800 FCM 60 57 700 50 56 600 TAGE (mV) 40 55 500 54 400 30 53 300 MINIMUM ON–TIME (ns) 20 MINIMUM OFF–TIME (ns) DROPOUT VOL 52 200 Burst Mode OPERATION 10 51 100 0 50 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 3 3.5 4 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8650S G17 8650S G18 8650s G19
Switching Frequency Burst Frequency Soft-Start Tracking
2.20 2.25 1.0 RT = 15kΩ VIN1 = VIN2 = 12V 2.15 2.00 VOUT = 5V SYNC = 0V 0.8 2.10 1.75 RT = 15kΩ L = 1.0µH 1.50 2.05 0.6 1.25 2.00 TAGE (V) 1.00 0.4 1.95 FB VOL 0.75 1.90 0.50 0.2 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 1.85 0.25 1.80 0 0 –55 –25 5 35 65 95 125 155 0 0.20 0.40 0.60 0.80 1.00 1.20 0 0.2 0.4 0.6 0.8 1.0 1.2 TEMPERATURE (°C) LOAD CURRENT (A) SS VOLTAGE (V) 8650S G20 8650S G21 8650s G22 Rev. B 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 Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Top FET Current Limit Bottom FET Current Limit Switch VDS
16 11 500 30% DC 10 450 14 9 400 12 8 350 10 7 (mV) 300 DS 6 250 8 5 200 CURRENT LIMIT (A) SWITCH V 6 CURRENT LIMIT (A) 4 150 3 100 4 2 50 TOP FET BOT FET 2 1 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 TEMPERATURE (°C) TEMPERATURE (°C) IDS (A) 8650S G14 8650S G15 8650S G16
Minimum On-Time Minimum Off-Time Dropout Voltage
80 60 1000 FCM, 2A LOAD FCM, 1A LOAD fSW = 2MHz 59 900 70 VOUT = 3V 58 800 FCM 60 57 700 50 56 600 TAGE (mV) 40 55 500 54 400 30 53 300 MINIMUM ON–TIME (ns) 20 MINIMUM OFF–TIME (ns) DROPOUT VOL 52 200 Burst Mode OPERATION 10 51 100 0 50 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 3 3.5 4 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8650S G17 8650S G18 8650s G19
Switching Frequency Burst Frequency Soft-Start Tracking
2.20 2.25 1.0 RT = 15kΩ VIN1 = VIN2 = 12V 2.15 2.00 VOUT = 5V SYNC = 0V 0.8 2.10 1.75 RT = 15kΩ L = 1.0µH 1.50 2.05 0.6 1.25 2.00 TAGE (V) 1.00 0.4 1.95 FB VOL 0.75 1.90 0.50 0.2 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 1.85 0.25 1.80 0 0 –55 –25 5 35 65 95 125 155 0 0.20 0.40 0.60 0.80 1.00 1.20 0 0.2 0.4 0.6 0.8 1.0 1.2 TEMPERATURE (°C) LOAD CURRENT (A) SS VOLTAGE (V) 8650S G20 8650S G21 8650s G22 Rev. B 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 Revision History Typical Application Related Parts