Datasheet LT8645S-2 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 65V, 8A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Seiten / Seite | 30 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. EN Pin Thresholds. Load Regulation. … |
| Revision | A |
| Dateiformat / Größe | PDF / 3.3 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. EN Pin Thresholds. Load Regulation. Line Regulation. Top FET Current Limit
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LT8645S-2
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds Load Regulation Line Regulation
1.03 0.20 0.20 1.02 EN RISING 0.15 0.15 1.01 (%) 0.10 (%) 0.10 1.00 OUT OUT 0.99 0.05 0.05 0.98 EN THRESHOLD (V) 0 0.00 EN FALLING CHANGE IN V CHANGE IN V 0.97 –0.05 VOUT = 5V –0.05 0.96 VIN = 12V VOUT = 5V VSYNC = 0V ILOAD = 2A 0.95 –0.10 –0.10 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 7 8 5 15 25 35 45 55 65 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8645S-2 G10 8645S-2 G11 8645S-2 G12
Top FET Current Limit No-Load Supply Current vs Duty Cycle Top FET Current Limit T
4.5 15.0 16 VOUT = 3.3V L = 4.7µH 4.0 14.5 IN-REGULATION 14.0 3.5 15 13.5 5% DC 3.0 13.0 14 2.5 12.5 INPUT CURRENT (µA) 2.0 CURRENT LIMIT (A) CURRENT LIMIT (A) 12.0 13 1.5 11.5 1.0 11.0 12 0 10 20 30 40 50 60 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8645S-2 G13 8645S-2 G14 8645S-2 G15
Switch Drop vs Temperature Switch Drop vs Switch Current Dropout Voltage
100 350 400 SWITCH CURRENT = 1A VIN = 5V V 300 350 OUT SET TO REGULATE AT 5V L = XEL6060, 1µH 80 300 250 60 250 200 TOP SWITCH TAGE (mV) 200 TOP SWITCH 40 150 150 SWITCH DROP (mV) SWITCH DROP (mV) 100 BOTTOM SWITCH DROPOUT VOL 100 20 BOTTOM SWITCH 50 50 0 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 TEMPERATURE (°C) SWITCH CURRENT (A) LOAD CURRENT (A) 8645S-2 G16 8645S-2 G17 8645S-2 G18 Rev. A 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds Load Regulation Line Regulation
1.03 0.20 0.20 1.02 EN RISING 0.15 0.15 1.01 (%) 0.10 (%) 0.10 1.00 OUT OUT 0.99 0.05 0.05 0.98 EN THRESHOLD (V) 0 0.00 EN FALLING CHANGE IN V CHANGE IN V 0.97 –0.05 VOUT = 5V –0.05 0.96 VIN = 12V VOUT = 5V VSYNC = 0V ILOAD = 2A 0.95 –0.10 –0.10 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 7 8 5 15 25 35 45 55 65 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8645S-2 G10 8645S-2 G11 8645S-2 G12
Top FET Current Limit No-Load Supply Current vs Duty Cycle Top FET Current Limit T
4.5 15.0 16 VOUT = 3.3V L = 4.7µH 4.0 14.5 IN-REGULATION 14.0 3.5 15 13.5 5% DC 3.0 13.0 14 2.5 12.5 INPUT CURRENT (µA) 2.0 CURRENT LIMIT (A) CURRENT LIMIT (A) 12.0 13 1.5 11.5 1.0 11.0 12 0 10 20 30 40 50 60 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8645S-2 G13 8645S-2 G14 8645S-2 G15
Switch Drop vs Temperature Switch Drop vs Switch Current Dropout Voltage
100 350 400 SWITCH CURRENT = 1A VIN = 5V V 300 350 OUT SET TO REGULATE AT 5V L = XEL6060, 1µH 80 300 250 60 250 200 TOP SWITCH TAGE (mV) 200 TOP SWITCH 40 150 150 SWITCH DROP (mV) SWITCH DROP (mV) 100 BOTTOM SWITCH DROPOUT VOL 100 20 BOTTOM SWITCH 50 50 0 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 TEMPERATURE (°C) SWITCH CURRENT (A) LOAD CURRENT (A) 8645S-2 G16 8645S-2 G17 8645S-2 G18 Rev. A 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts