Datasheet LT8614 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Line Regulation. No-Load Supply … |
| Revision | E |
| File Format / Size | PDF / 1.5 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Line Regulation. No-Load Supply Current. Top FET Current Limit vs Duty Cycle
Text Version of Document
LT8614
TYPICAL PERFORMANCE CHARACTERISTICS Line Regulation No-Load Supply Current No-Load Supply Current
0.10 5.0 25 V V V 0.08 OUT = 5V OUT = 3.3V OUT = 3.3V I 4.5 LOAD = 1A IN REGULATION VIN = 12V 0.06 4.0 20 IN REGULATION 0.04 3.5 (%) OUT 0.02 3.0 15 0 2.5 –0.02 2.0 10 CHANGE IN V –0.04 INPUT CURRENT (µA) 1.5 INPUT CURRENT (µA) –0.06 1.0 5 –0.08 0.5 –0.10 0 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 –55 –25 5 35 65 95 125 155 INPUT VOLTAGE (V) INPUT VOLTAGE (V) TEMPERATURE (°C) 8614 G10 8614 G11 8614 G12
Top FET Current Limit vs Duty Cycle Top FET Current Limit Bottom FET Current Limit
9.0 9.5 7.5 9.0 7.0 8.5 8.5 6.5 8.0 5% DC 8.0 6.0 7.5 7.5 5.5 CURRENT LIMIT (A) 7.0 CURRENT LIMIT (A) CURRENT LIMIT (A) 7.0 5.0 6.5 6.5 4.5 6.0 6.0 4.0 0 0.2 0.4 0.6 0.8 1.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 DUTY CYCLE TEMPERATURE (°C) TEMPERATURE (°C) 8614 G13 8614 G14 8614 G15
Switch Drop Switch Drop Minimum On-Time
200 500 40 SWITCH CURRENT = 1A I 450 38 LOAD = 1A, VSYNC = 0V 175 ILOAD = 1A, VSYNC = 3V 400 36 ILOAD = 2A 150 ILOAD = 4A 350 34 125 TOP SWITCH 300 32 TOP SWITCH 100 250 30 75 200 28 SWITCH DROP (mV) SWITCH DROP (mV) 150 26 50 MINIMUM ON-TIME (ns) BOTTOM SWITCH 100 24 25 BOTTOM SWITCH 50 22 0 0 20 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8614 G16 8614 G17 8614 G18 Rev. E For more information www.analog.com 5 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 Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Line Regulation No-Load Supply Current No-Load Supply Current
0.10 5.0 25 V V V 0.08 OUT = 5V OUT = 3.3V OUT = 3.3V I 4.5 LOAD = 1A IN REGULATION VIN = 12V 0.06 4.0 20 IN REGULATION 0.04 3.5 (%) OUT 0.02 3.0 15 0 2.5 –0.02 2.0 10 CHANGE IN V –0.04 INPUT CURRENT (µA) 1.5 INPUT CURRENT (µA) –0.06 1.0 5 –0.08 0.5 –0.10 0 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 –55 –25 5 35 65 95 125 155 INPUT VOLTAGE (V) INPUT VOLTAGE (V) TEMPERATURE (°C) 8614 G10 8614 G11 8614 G12
Top FET Current Limit vs Duty Cycle Top FET Current Limit Bottom FET Current Limit
9.0 9.5 7.5 9.0 7.0 8.5 8.5 6.5 8.0 5% DC 8.0 6.0 7.5 7.5 5.5 CURRENT LIMIT (A) 7.0 CURRENT LIMIT (A) CURRENT LIMIT (A) 7.0 5.0 6.5 6.5 4.5 6.0 6.0 4.0 0 0.2 0.4 0.6 0.8 1.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 DUTY CYCLE TEMPERATURE (°C) TEMPERATURE (°C) 8614 G13 8614 G14 8614 G15
Switch Drop Switch Drop Minimum On-Time
200 500 40 SWITCH CURRENT = 1A I 450 38 LOAD = 1A, VSYNC = 0V 175 ILOAD = 1A, VSYNC = 3V 400 36 ILOAD = 2A 150 ILOAD = 4A 350 34 125 TOP SWITCH 300 32 TOP SWITCH 100 250 30 75 200 28 SWITCH DROP (mV) SWITCH DROP (mV) 150 26 50 MINIMUM ON-TIME (ns) BOTTOM SWITCH 100 24 25 BOTTOM SWITCH 50 22 0 0 20 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8614 G16 8614 G17 8614 G18 Rev. E For more information www.analog.com 5 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 Package Description Revision History Typical Applications Related Parts
