Datasheet LT8611 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5μA Quiescent Current |
| Pages / Page | 26 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. No Load Supply Current. Top FET … |
| File Format / Size | PDF / 343 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. No Load Supply Current. Top FET Current Limit vs Duty Cycle. Top FET Current Limit
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LT8611
TYPICAL PERFORMANCE CHARACTERISTICS No Load Supply Current No Load Supply Current Top FET Current Limit vs Duty Cycle
5.0 25 6.0 V V 4.5 OUT = 3.3V OUT = 3.3V IN REGULATION VIN = 12V 5.5 4.0 20 IN REGULATION 5.0 3.5 3.0 15 4.5 2.5 4.0 2.0 10 3.5 INPUT CURRENT (µA) 1.5 INPUT CURRENT (µA) CURRENT LIMIT (A) 3.0 1.0 5 0.5 2.5 0 0 2.0 0 5 10 15 20 25 30 35 40 45 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 INPUT VOLTAGE (V) TEMPERATURE (°C) DUTY CYCLE 8611 G10 8611 G11 8611 G12
Top FET Current Limit Bottom FET Current Limit Switch Drop
5.0 3.6 250 SWITCH CURRENT = 1A 3.4 4.5 30% DC 200 3.2 4.0 150 70% DC TOP SW 3.0 3.5 100 BOT SW CURRENT LIMIT (A) CURRENT LIMIT (A) 2.8 SWITCH DROP (mV) 3.0 2.6 50 2.5 2.4 0 –55 –25 5 35 65 95 125 –55 –25 5 35 65 95 125 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8611 G13 8611 G14 8611 G15
Switch Drop Minimum On-Time Minimum Off-Time
450 80 100 ILOAD = 1A, VSYNC = 0V VIN = 3.3V 400 75 ILOAD = 1A, VSYNC = 3V 95 ILOAD = 0.5A I 350 70 LOAD = 2.5A, VSYNC = 0V ILOAD = 2.5A, VSYNC = 3V 90 65 300 85 60 250 TOP SW 55 80 200 BOT SW 50 75 150 SWITCH DROP (mV) 45 MINIMUM ON-TIME (ns) MINIMUM OFF-TIME (ns) 70 100 40 65 50 35 0 30 60 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 –50 –25 5 35 65 95 125 155 SWITCH CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 8611 G16 8611 G17 8611 G18 8611fa For more information www.linear.com/LT8611 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS No Load Supply Current No Load Supply Current Top FET Current Limit vs Duty Cycle
5.0 25 6.0 V V 4.5 OUT = 3.3V OUT = 3.3V IN REGULATION VIN = 12V 5.5 4.0 20 IN REGULATION 5.0 3.5 3.0 15 4.5 2.5 4.0 2.0 10 3.5 INPUT CURRENT (µA) 1.5 INPUT CURRENT (µA) CURRENT LIMIT (A) 3.0 1.0 5 0.5 2.5 0 0 2.0 0 5 10 15 20 25 30 35 40 45 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 INPUT VOLTAGE (V) TEMPERATURE (°C) DUTY CYCLE 8611 G10 8611 G11 8611 G12
Top FET Current Limit Bottom FET Current Limit Switch Drop
5.0 3.6 250 SWITCH CURRENT = 1A 3.4 4.5 30% DC 200 3.2 4.0 150 70% DC TOP SW 3.0 3.5 100 BOT SW CURRENT LIMIT (A) CURRENT LIMIT (A) 2.8 SWITCH DROP (mV) 3.0 2.6 50 2.5 2.4 0 –55 –25 5 35 65 95 125 –55 –25 5 35 65 95 125 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8611 G13 8611 G14 8611 G15
Switch Drop Minimum On-Time Minimum Off-Time
450 80 100 ILOAD = 1A, VSYNC = 0V VIN = 3.3V 400 75 ILOAD = 1A, VSYNC = 3V 95 ILOAD = 0.5A I 350 70 LOAD = 2.5A, VSYNC = 0V ILOAD = 2.5A, VSYNC = 3V 90 65 300 85 60 250 TOP SW 55 80 200 BOT SW 50 75 150 SWITCH DROP (mV) 45 MINIMUM ON-TIME (ns) MINIMUM OFF-TIME (ns) 70 100 40 65 50 35 0 30 60 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 –50 –25 5 35 65 95 125 155 SWITCH CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 8611 G16 8611 G17 8611 G18 8611fa For more information www.linear.com/LT8611 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
