Datasheet LT8645S, LT8646S (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current |
| Pages / Page | 30 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Burst Mode Operation Efficiency. vs … |
| Revision | B |
| File Format / Size | PDF / 2.4 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Burst Mode Operation Efficiency. vs Inductor Value (LT8645S). Reference Voltage
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LT8645S/LT8646S
TYPICAL PERFORMANCE CHARACTERISTICS Burst Mode Operation Efficiency vs Inductor Value (LT8645S) Reference Voltage EN Pin Thresholds
100 979 1.03 95 977 1.02 VIN = 12V 975 EN RISING 1.01 90 973 1.00 85 TAGE (mV) 971 VIN = 24V 0.99 80 969 EFFICIENCY (%) 0.98 967 75 EN THRESHOLD (V) REFERENCE VOL 965 0.97 EN FALLING VOUT = 5V 70 ILOAD = 10mA 963 0.96 L = WE–LHMI7050 65 961 0.95 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 INDUCTOR VALUE (µH) TEMPERATURE (°C) TEMPERATURE (°C) 8645S G10 8645S G11 8645S G12
LT8645S Load Regulation LT8646S Load Regulation LT8645S Line Regulation
0.20 0.40 0.20 0.30 0.15 0.15 0.20 (%) 0.10 (%) 0.10 (%) 0.10 OUT OUT 0.00 OUT 0.05 0.05 –0.10 0 –0.20 0.00 CHANGE IN V CHANGE IN V CHANGE IN V –0.30 –0.05 VOUT = 5V VOUT = 5V –0.05 VIN = 12V –0.40 VIN = 12V VOUT = 5V VSYNC = 0V VSYNC = 0V ILOAD = 2A –0.10 –0.50 –0.10 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 5 15 25 35 45 55 65 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 8645S G13 8645S G14 8645S G15
LT8646S Line Regulation LT8646S Line Regulation LT8645S No-Load Supply Current LT8646S No-Load Supply Current
0.30 4.5 225 V V OUT = 3.3V OUT = 5V 0.25 L = 4.7µH 200 L = 4.7µH 4.0 IN-REGULATION IN REGULATION 0.20 175 3.5 (%) 0.15 150 OUT 3.0 0.10 125 2.5 0.05 100 CHANGE IN V INPUT CURRENT (µA) 2.0 INPUT CURRENT (µA) 0 75 –0.05 V 1.5 50 OUT = 5V ILOAD = 2A –0.10 1.0 25 5 15 25 35 45 55 65 0 10 20 30 40 50 60 0 10 20 30 40 50 60 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8645S G16 8645S G17 8645S G18 Rev. B 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Burst Mode Operation Efficiency vs Inductor Value (LT8645S) Reference Voltage EN Pin Thresholds
100 979 1.03 95 977 1.02 VIN = 12V 975 EN RISING 1.01 90 973 1.00 85 TAGE (mV) 971 VIN = 24V 0.99 80 969 EFFICIENCY (%) 0.98 967 75 EN THRESHOLD (V) REFERENCE VOL 965 0.97 EN FALLING VOUT = 5V 70 ILOAD = 10mA 963 0.96 L = WE–LHMI7050 65 961 0.95 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 INDUCTOR VALUE (µH) TEMPERATURE (°C) TEMPERATURE (°C) 8645S G10 8645S G11 8645S G12
LT8645S Load Regulation LT8646S Load Regulation LT8645S Line Regulation
0.20 0.40 0.20 0.30 0.15 0.15 0.20 (%) 0.10 (%) 0.10 (%) 0.10 OUT OUT 0.00 OUT 0.05 0.05 –0.10 0 –0.20 0.00 CHANGE IN V CHANGE IN V CHANGE IN V –0.30 –0.05 VOUT = 5V VOUT = 5V –0.05 VIN = 12V –0.40 VIN = 12V VOUT = 5V VSYNC = 0V VSYNC = 0V ILOAD = 2A –0.10 –0.50 –0.10 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 5 15 25 35 45 55 65 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 8645S G13 8645S G14 8645S G15
LT8646S Line Regulation LT8646S Line Regulation LT8645S No-Load Supply Current LT8646S No-Load Supply Current
0.30 4.5 225 V V OUT = 3.3V OUT = 5V 0.25 L = 4.7µH 200 L = 4.7µH 4.0 IN-REGULATION IN REGULATION 0.20 175 3.5 (%) 0.15 150 OUT 3.0 0.10 125 2.5 0.05 100 CHANGE IN V INPUT CURRENT (µA) 2.0 INPUT CURRENT (µA) 0 75 –0.05 V 1.5 50 OUT = 5V ILOAD = 2A –0.10 1.0 25 5 15 25 35 45 55 65 0 10 20 30 40 50 60 0 10 20 30 40 50 60 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8645S G16 8645S G17 8645S G18 Rev. B 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
