Datasheet LT8642S (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 18V, 10A Synchronous Step-Down Silent Switcher 2 |
| Pages / Page | 26 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. EN Pin Thresholds. Load Regulation. … |
| File Format / Size | PDF / 1.4 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. EN Pin Thresholds. Load Regulation. Line Regulation. No-Load Supply Current
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LT8642S
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds Load Regulation Line Regulation
1.01 1.00 0.10 VOUT = 1.2V 1.00 0.75 V 0.08 IN = 12V 0.06 0.99 0.50 EN RISING 0.04 0.98 (%) 0.25 (%) OUT 0.02 OUT 0.97 0 0.00 0.96 –0.25 –0.02 EN THRESHOLD (V) CHANGE IN V CHANGE IN V –0.04 0.95 EN FALLING –0.50 –0.06 V 0.94 –0.75 OUT = FB Burst Mode OPERATION –0.08 ILOAD = 1A FORCED CONTINUOUS MODE FC MODE 0.93 –1.00 –0.10 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 4 6 8 10 12 14 16 18 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8642S G08 8640S G09 8642S G10
No-Load Supply Current Top FET Current Limit vs Duty Cycle Top FET Current Limit
300 18 22 VOUT = 1.2V 290 L = 0.28µH 21 R 17 280 1, R2 = 100k Burst Mode OPERATION 20 270 IN REGULATION 16 260 19 250 15 5% DC 18 240 17 14 230 INPUT CURRENT (µA) CURRENT LIMIT (A) CURRENT LIMIT (A) 16 220 13 210 15 200 12 14 4 6 8 10 12 14 16 18 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8642S G11 8642S G12 8642S G13
Switch RDS(ON) vs Temperature Dropout Voltage
30 400 VIN = 3.3V 350 VOUT SET TO REGULATE AT 3.3V 25 L = XEL6060, 0.82µH (DCR = 3mΩ) 300 20 TOP SWITCH 250 (mΩ) TAGE (mV) 15 200 ON RDS 150 10 BOTTOM SWITCH DROPOUT VOL 100 5 50 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 TEMPERATURE (°C) LOAD CURRENT (A) 8642S G14 8642S G15 Rev 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds Load Regulation Line Regulation
1.01 1.00 0.10 VOUT = 1.2V 1.00 0.75 V 0.08 IN = 12V 0.06 0.99 0.50 EN RISING 0.04 0.98 (%) 0.25 (%) OUT 0.02 OUT 0.97 0 0.00 0.96 –0.25 –0.02 EN THRESHOLD (V) CHANGE IN V CHANGE IN V –0.04 0.95 EN FALLING –0.50 –0.06 V 0.94 –0.75 OUT = FB Burst Mode OPERATION –0.08 ILOAD = 1A FORCED CONTINUOUS MODE FC MODE 0.93 –1.00 –0.10 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 4 6 8 10 12 14 16 18 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8642S G08 8640S G09 8642S G10
No-Load Supply Current Top FET Current Limit vs Duty Cycle Top FET Current Limit
300 18 22 VOUT = 1.2V 290 L = 0.28µH 21 R 17 280 1, R2 = 100k Burst Mode OPERATION 20 270 IN REGULATION 16 260 19 250 15 5% DC 18 240 17 14 230 INPUT CURRENT (µA) CURRENT LIMIT (A) CURRENT LIMIT (A) 16 220 13 210 15 200 12 14 4 6 8 10 12 14 16 18 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8642S G11 8642S G12 8642S G13
Switch RDS(ON) vs Temperature Dropout Voltage
30 400 VIN = 3.3V 350 VOUT SET TO REGULATE AT 3.3V 25 L = XEL6060, 0.82µH (DCR = 3mΩ) 300 20 TOP SWITCH 250 (mΩ) TAGE (mV) 15 200 ON RDS 150 10 BOTTOM SWITCH DROPOUT VOL 100 5 50 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 TEMPERATURE (°C) LOAD CURRENT (A) 8642S G14 8642S G15 Rev 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Applications Related Parts
