Datasheet LT8640, LT8640-1 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 30 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. 12V. IN to 5VOUT Efficiency. IN to … |
| Revision | C |
| File Format / Size | PDF / 1.9 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. 12V. IN to 5VOUT Efficiency. IN to 3.3VOUT Efficiency. vs Frequency. Efficiency at 5VOUT
Model Line for this Datasheet
Text Version of Document
LT8640/LT8640-1
TYPICAL PERFORMANCE CHARACTERISTICS 12V 12V IN to 5VOUT Efficiency IN to 3.3VOUT Efficiency vs Frequency vs Frequency Efficiency at 5VOUT
100 3.00 100 2.80 100 3.0 95 2.63 95 2.45 95 2.7 90 2.4 90 EFFICIENCY 2.25 90 2.10 EFFICIENCY POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 2.1 POWER LOSS (W) 85 1.88 85 1.75 80 1.8 80 1.50 80 1.40 75 1.5 POWER LOSS 70 1.2 75 1.13 EFFICIENCY (%) EFFICIENCY (%) 75 1.05 EFFICIENCY (%) POWER LOSS POWER LOSS 65 V 0.9 70 L = WE–LHMI1040 0.75 70 0.70 IN = 12V L = WE–LHMI1040 60 VIN = 24V 0.6 1MHz, L = 3.3µH 1MHz, L = 2.2μH VIN = 36V 65 0.38 65 0.35 2MHz, L = 2.2µH 2MHz, L = 1μH 55 fSW = 1MHz 0.3 3MHz, L = 1µH 3MHz, L = 1μH L = IHLP3232DZ-01, 3.3μH 60 0 60 0 50 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8640 G01 8640 G02 8640 G03
Efficiency at 3.3VOUT Efficiency at 5VOUT Efficiency at 3.3VOUT
100 3.0 100 100 95 2.7 90 90 90 2.4 80 80 85 EFFICIENCY 2.1 POWER LOSS (W) 70 70 80 1.8 60 60 75 1.5 50 50 POWER LOSS 70 1.2 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 V 0.9 IN = 12V 30 fSW = 1MHz 30 fSW = 1MHz L = IHLP3232DZ-01, 4.7μH L = IHLP3232DZ-01, 4.7μH 60 VIN = 24V 0.6 V 20 20 IN = 36V VIN = 12V VIN = 12V 55 f V V SW = 1MHz 0.3 10 IN = 24V 10 IN = 24V L = IHLP3232DZ-01, 2.2μH VIN = 36V VIN = 36V 50 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 LOAD CURRENT (A) LOAD CURRENT (mA) LOAD CURRENT (mA) 8640 G04 8640 G05 8640 G06
Burst Mode Operation Efficiency Efficiency vs Frequency vs Inductor Value Reference Voltage
96 95 0.979 VIN = 12V 94 0.977 90 92 0.975 V 85 IN = 24V 0.973 90 0.971 88 80 0.969 86 EFFICIENCY (%) EFFICIENCY (%) 75 0.967 84 V REFERENCE VOLAGE (V) IN = 12V 0.965 VOUT = 3.3V 70 VOUT = 5V 82 ILOAD = 2A ILOAD = 10mA 0.963 L = IHLP3232DZ-01, 4.7μH L = IHLP3232DZ-01 80 65 0.961 0 0.5 1 1.5 2 2.5 3 1 2 3 4 5 6 7 8 –50 –25 0 25 50 75 100 125 150 SWITCHING FREQUENCY (MHz) INDUCTOR VALUE (µH) TEMPERATURE (°C) 8640 G07 8640 G08 8640 G09 Rev.C For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS 12V 12V IN to 5VOUT Efficiency IN to 3.3VOUT Efficiency vs Frequency vs Frequency Efficiency at 5VOUT
100 3.00 100 2.80 100 3.0 95 2.63 95 2.45 95 2.7 90 2.4 90 EFFICIENCY 2.25 90 2.10 EFFICIENCY POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 2.1 POWER LOSS (W) 85 1.88 85 1.75 80 1.8 80 1.50 80 1.40 75 1.5 POWER LOSS 70 1.2 75 1.13 EFFICIENCY (%) EFFICIENCY (%) 75 1.05 EFFICIENCY (%) POWER LOSS POWER LOSS 65 V 0.9 70 L = WE–LHMI1040 0.75 70 0.70 IN = 12V L = WE–LHMI1040 60 VIN = 24V 0.6 1MHz, L = 3.3µH 1MHz, L = 2.2μH VIN = 36V 65 0.38 65 0.35 2MHz, L = 2.2µH 2MHz, L = 1μH 55 fSW = 1MHz 0.3 3MHz, L = 1µH 3MHz, L = 1μH L = IHLP3232DZ-01, 3.3μH 60 0 60 0 50 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8640 G01 8640 G02 8640 G03
Efficiency at 3.3VOUT Efficiency at 5VOUT Efficiency at 3.3VOUT
100 3.0 100 100 95 2.7 90 90 90 2.4 80 80 85 EFFICIENCY 2.1 POWER LOSS (W) 70 70 80 1.8 60 60 75 1.5 50 50 POWER LOSS 70 1.2 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 V 0.9 IN = 12V 30 fSW = 1MHz 30 fSW = 1MHz L = IHLP3232DZ-01, 4.7μH L = IHLP3232DZ-01, 4.7μH 60 VIN = 24V 0.6 V 20 20 IN = 36V VIN = 12V VIN = 12V 55 f V V SW = 1MHz 0.3 10 IN = 24V 10 IN = 24V L = IHLP3232DZ-01, 2.2μH VIN = 36V VIN = 36V 50 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 LOAD CURRENT (A) LOAD CURRENT (mA) LOAD CURRENT (mA) 8640 G04 8640 G05 8640 G06
Burst Mode Operation Efficiency Efficiency vs Frequency vs Inductor Value Reference Voltage
96 95 0.979 VIN = 12V 94 0.977 90 92 0.975 V 85 IN = 24V 0.973 90 0.971 88 80 0.969 86 EFFICIENCY (%) EFFICIENCY (%) 75 0.967 84 V REFERENCE VOLAGE (V) IN = 12V 0.965 VOUT = 3.3V 70 VOUT = 5V 82 ILOAD = 2A ILOAD = 10mA 0.963 L = IHLP3232DZ-01, 4.7μH L = IHLP3232DZ-01 80 65 0.961 0 0.5 1 1.5 2 2.5 3 1 2 3 4 5 6 7 8 –50 –25 0 25 50 75 100 125 150 SWITCHING FREQUENCY (MHz) INDUCTOR VALUE (µH) TEMPERATURE (°C) 8640 G07 8640 G08 8640 G09 Rev.C For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
