Datasheet LT8650S-1 (Analog Devices) - 6
| Fabricante | Analog Devices |
| Descripción | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| Páginas / Página | 32 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Minimum On-Time. Minimum Off-Time. … |
| Formato / tamaño de archivo | PDF / 1.5 Mb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Minimum On-Time. Minimum Off-Time. Dropout Voltage. Switching Frequency. Burst Frequency
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LT8650S-1
TYPICAL PERFORMANCE CHARACTERISTICS Minimum On-Time Minimum Off-Time Dropout Voltage
80 60 1000 FCM, 2A LOAD FCM, 1A LOAD fSW = 2MHz 70 59 900 VOUT = 3V 58 800 FCM 60 57 700 50 56 600 TAGE (mV) 40 55 500 30 54 400 53 300 MINIMUM ON–TIME (ns) 20 MINIMUM OFF–TIME (ns) DROPOUT VOL 52 200 Burst Mode 10 OPERATION 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) 8650s1 G17 8650s1 G18 8650s1 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 1.95 0.4 0.75 FB VOL 1.90 0.50 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 0.2 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) 8650s1 G20 8650s1 G21 8650s1 G22
Soft-Start Current EN Pin Thresholds PG High Threshold
2.4 0.78 10.0 VSS = 0.4V 2.3 0.77 9.5 (%) REF 9.0 2.2 0.76 8.5 2.1 0.75 8.0 2.0 0.74 7.5 1.9 0.73 7.0 EN THRESHOLD (V) SS PIN CURRENT (µA) 6.5 1.8 0.72 6.0 1.7 0.71 EN RISING 5.5 EN FALLING PG THRESHOLD OFFSET FROM V RISING 1.6 0.70 5.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8650s1 G23 8650s1 G24 86501s1 G25 Rev 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Minimum On-Time Minimum Off-Time Dropout Voltage
80 60 1000 FCM, 2A LOAD FCM, 1A LOAD fSW = 2MHz 70 59 900 VOUT = 3V 58 800 FCM 60 57 700 50 56 600 TAGE (mV) 40 55 500 30 54 400 53 300 MINIMUM ON–TIME (ns) 20 MINIMUM OFF–TIME (ns) DROPOUT VOL 52 200 Burst Mode 10 OPERATION 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) 8650s1 G17 8650s1 G18 8650s1 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 1.95 0.4 0.75 FB VOL 1.90 0.50 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 0.2 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) 8650s1 G20 8650s1 G21 8650s1 G22
Soft-Start Current EN Pin Thresholds PG High Threshold
2.4 0.78 10.0 VSS = 0.4V 2.3 0.77 9.5 (%) REF 9.0 2.2 0.76 8.5 2.1 0.75 8.0 2.0 0.74 7.5 1.9 0.73 7.0 EN THRESHOLD (V) SS PIN CURRENT (µA) 6.5 1.8 0.72 6.0 1.7 0.71 EN RISING 5.5 EN FALLING PG THRESHOLD OFFSET FROM V RISING 1.6 0.70 5.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8650s1 G23 8650s1 G24 86501s1 G25 Rev 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts