Datasheet LT8641 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 65V, 3.5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 26 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency. 12VIN to … |
| Revision | B |
| File Format / Size | PDF / 3.4 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency. 12VIN to 3.3VOUT Efficiency. vs Frequency. Efficiency at 5VOUT
Model Line for this Datasheet
LT8641
Text Version of Document
LT8641
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency 12VIN to 3.3VOUT Efficiency vs Frequency vs Frequency Efficiency at 5VOUT
100 2.6 100 2.4 100 2.5 EFFICIENCY 95 2.3 95 2.1 95 2.3 90 2.0 90 EFFICIENCY 1.9 90 1.8 POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 1.8 POWER LOSS (W) 85 1.6 85 1.5 80 1.5 fSW = 1MHz 80 1.3 80 1.2 75 L = WE–LHMI7050, 4.7µH 1.3 75 1.0 70 1.0 EFFICIENCY (%) 75 0.9 EFFICIENCY (%) EFFICIENCY (%) POWER LOSS POWER LOSS 65 0.8 70 0.7 VIN = 12V L = WE–LHMI7050 70 L = WE–LHMI7050 0.6 60 0.5 1MHz, L = 3.3μH 1MHz, L = 2.2µH VIN = 24V 65 2MHz, L = 2.2μH 0.3 65 2MHz, L = 1.5µH 0.3 V 55 IN = 36V 0.3 3MHz, L = 1.5μH 3MHz, L = 1µH POWER LOSS VIN = 48V 60 0 60 0 50 0 0.5 1 1.5 2 2.5 3 3.5 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8641 G01 8641 G02 8641 G03
Efficiency at 3.3VOUT Efficiency at 5VOUT Efficiency at 3.3VOUT
100 2.5 100 100 fSW = 1MHz EFFICIENCY 95 L = WE–LHMI7050, 2.2µH 2.3 90 90 90 2.0 80 80 85 1.8 POWER LOSS (W) 80 1.5 70 70 75 1.3 60 60 70 1.0 EFFICIENCY (%) 50 50 65 0.8 EFFICIENCY (%) EFFICIENCY (%) V V V IN = 12V IN = 12V IN = 12V 60 40 40 V 0.5 IN = 24V VIN = 24V V = 24V 55 VIN = 36V 0.3 30 f V SW = 1MHz IN = 36V 30 f VIN = 36V POWER LOSS V SW = 1MHz IN = 48V 50 0 L = WE–LHMI7050, 4.7µH VIN = 48V L = WE–LHMI7050, 4.7µH VIN = 48V 0 0.5 1 1.5 2 2.5 3 3.5 20 20 LOAD CURRENT (A) 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 8641 G04 LOAD CURRENT (mA) LOAD CURRENT (mA) 8641 G05 8641 G06
Burst Mode Operation Efficiency Efficiency vs Frequency vs Inductor Value Reference Voltage Reference Voltage
96 100 819 94 VIN = 12V 95 817 VIN = 12V 92 815 90 VIN = 24V 90 813 85 TAGE (mV) 811 88 VIN = 24V 80 809 86 EFFICIENCY (%) EFFICIENCY (%) 807 84 75 V REFERENCE VOL 805 OUT = 3.3V VOUT = 5V 82 ILOAD = 1.5A 70 ILOAD = 10mA 803 L = WE–LHMI7050, 4.7µH L = WE–LHMI7050 80 65 801 0.5 1.0 1.5 2.0 2.5 3.0 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 150 SWITCHING FREQUENCY (MHz) INDUCTOR VALUE (µH) TEMPERATURE (°C) 8641 G07 8641 G08 8641 G09 Rev A 4 For more information www.analog.com 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 Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency 12VIN to 3.3VOUT Efficiency vs Frequency vs Frequency Efficiency at 5VOUT
100 2.6 100 2.4 100 2.5 EFFICIENCY 95 2.3 95 2.1 95 2.3 90 2.0 90 EFFICIENCY 1.9 90 1.8 POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 1.8 POWER LOSS (W) 85 1.6 85 1.5 80 1.5 fSW = 1MHz 80 1.3 80 1.2 75 L = WE–LHMI7050, 4.7µH 1.3 75 1.0 70 1.0 EFFICIENCY (%) 75 0.9 EFFICIENCY (%) EFFICIENCY (%) POWER LOSS POWER LOSS 65 0.8 70 0.7 VIN = 12V L = WE–LHMI7050 70 L = WE–LHMI7050 0.6 60 0.5 1MHz, L = 3.3μH 1MHz, L = 2.2µH VIN = 24V 65 2MHz, L = 2.2μH 0.3 65 2MHz, L = 1.5µH 0.3 V 55 IN = 36V 0.3 3MHz, L = 1.5μH 3MHz, L = 1µH POWER LOSS VIN = 48V 60 0 60 0 50 0 0.5 1 1.5 2 2.5 3 3.5 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8641 G01 8641 G02 8641 G03
Efficiency at 3.3VOUT Efficiency at 5VOUT Efficiency at 3.3VOUT
100 2.5 100 100 fSW = 1MHz EFFICIENCY 95 L = WE–LHMI7050, 2.2µH 2.3 90 90 90 2.0 80 80 85 1.8 POWER LOSS (W) 80 1.5 70 70 75 1.3 60 60 70 1.0 EFFICIENCY (%) 50 50 65 0.8 EFFICIENCY (%) EFFICIENCY (%) V V V IN = 12V IN = 12V IN = 12V 60 40 40 V 0.5 IN = 24V VIN = 24V V = 24V 55 VIN = 36V 0.3 30 f V SW = 1MHz IN = 36V 30 f VIN = 36V POWER LOSS V SW = 1MHz IN = 48V 50 0 L = WE–LHMI7050, 4.7µH VIN = 48V L = WE–LHMI7050, 4.7µH VIN = 48V 0 0.5 1 1.5 2 2.5 3 3.5 20 20 LOAD CURRENT (A) 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 8641 G04 LOAD CURRENT (mA) LOAD CURRENT (mA) 8641 G05 8641 G06
Burst Mode Operation Efficiency Efficiency vs Frequency vs Inductor Value Reference Voltage Reference Voltage
96 100 819 94 VIN = 12V 95 817 VIN = 12V 92 815 90 VIN = 24V 90 813 85 TAGE (mV) 811 88 VIN = 24V 80 809 86 EFFICIENCY (%) EFFICIENCY (%) 807 84 75 V REFERENCE VOL 805 OUT = 3.3V VOUT = 5V 82 ILOAD = 1.5A 70 ILOAD = 10mA 803 L = WE–LHMI7050, 4.7µH L = WE–LHMI7050 80 65 801 0.5 1.0 1.5 2.0 2.5 3.0 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 150 SWITCHING FREQUENCY (MHz) INDUCTOR VALUE (µH) TEMPERATURE (°C) 8641 G07 8641 G08 8641 G09 Rev A 4 For more information www.analog.com 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 Applications Related Parts
