Datasheet LT8636 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Pages / Page | 26 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency at 5VOUT. Efficiency at … |
| Revision | A |
| File Format / Size | PDF / 2.1 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency at 5VOUT. Efficiency at 3.3VOUT. Efficiency vs Frequency
Text Version of Document
LT8636
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency at 5VOUT Efficiency at 3.3VOUT Efficiency vs Frequency
100 100 96 90 90 94 80 80 92 70 70 90 60 60 88 Burst Mode OPERATION 50 50 Burst Mode OPERATION 86 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) fSW = 1MHz fSW = 1MHz L = XEL6060, 4.7µH 40 40 L = XEL6060, 4.7µH 84 VIN = 12V VIN = 12V VIN = 12V VOUT = 3.3V 30 30 82 VIN = 24V VIN = 24V ILOAD = 2A VIN = 36V VIN = 36V L = IHLP3232DZ-01, 4.7µH 20 20 80 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 0 0.5 1 1.5 2 2.5 3 LOAD CURRENT (mA) LOAD CURRENT (mA) SWITCHING FREQUENCY (MHz) 8636 G05 8636 G07 8636 G09
Burst Mode Operation Efficiency vs Inductor Value vs Inductor V Reference Voltage Reference V EN Pin Thresholds
100 979 1.03 V 95 IN = 12V 977 1.02 EN RISING 975 1.01 90 973 1.00 85 VIN = 24V TAGE (mV) 971 0.99 80 969 EFFICIENCY (%) 0.98 967 75 EN THRESHOLD (V) EN FALLING REFERENCE VOL 965 0.97 VOUT = 5V 70 ILOAD = 10mA 963 0.96 L = IHLP3232DZ-01 65 961 0.95 1 2 3 4 5 6 7 8 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 INDUCTOR VALUE (µH) TEMPERATURE (°C) TEMPERATURE (°C) 8636 G10 8636 G11 8636 G12
Load Regulation Line Regulation No-Load Supply Current
0.15 0.12 4.0 0.10 0.10 3.5 0.08 0.06 (%) 0.05 (%) 3.0 OUT 0.04 OUT 0 0.02 2.5 0.00 0.05 2.0 CHANGE IN V CHANGE IN V –0.02 INPUT CURRENT (µA) V V OUT = 3.3V OUT = 5V –0.04 –0.10 1.5 L = 4.7µH VIN = 12V V –0.06 OUT = 5V BIAS = V V OUT SYNC = 0V ILOAD = 1A IN REGULATION –0.15 –0.08 1.0 0 1 2 3 4 5 6 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8636 G13 8636 G15 8636 G17 Rev. A 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 Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency at 5VOUT Efficiency at 3.3VOUT Efficiency vs Frequency
100 100 96 90 90 94 80 80 92 70 70 90 60 60 88 Burst Mode OPERATION 50 50 Burst Mode OPERATION 86 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) fSW = 1MHz fSW = 1MHz L = XEL6060, 4.7µH 40 40 L = XEL6060, 4.7µH 84 VIN = 12V VIN = 12V VIN = 12V VOUT = 3.3V 30 30 82 VIN = 24V VIN = 24V ILOAD = 2A VIN = 36V VIN = 36V L = IHLP3232DZ-01, 4.7µH 20 20 80 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 0 0.5 1 1.5 2 2.5 3 LOAD CURRENT (mA) LOAD CURRENT (mA) SWITCHING FREQUENCY (MHz) 8636 G05 8636 G07 8636 G09
Burst Mode Operation Efficiency vs Inductor Value vs Inductor V Reference Voltage Reference V EN Pin Thresholds
100 979 1.03 V 95 IN = 12V 977 1.02 EN RISING 975 1.01 90 973 1.00 85 VIN = 24V TAGE (mV) 971 0.99 80 969 EFFICIENCY (%) 0.98 967 75 EN THRESHOLD (V) EN FALLING REFERENCE VOL 965 0.97 VOUT = 5V 70 ILOAD = 10mA 963 0.96 L = IHLP3232DZ-01 65 961 0.95 1 2 3 4 5 6 7 8 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 INDUCTOR VALUE (µH) TEMPERATURE (°C) TEMPERATURE (°C) 8636 G10 8636 G11 8636 G12
Load Regulation Line Regulation No-Load Supply Current
0.15 0.12 4.0 0.10 0.10 3.5 0.08 0.06 (%) 0.05 (%) 3.0 OUT 0.04 OUT 0 0.02 2.5 0.00 0.05 2.0 CHANGE IN V CHANGE IN V –0.02 INPUT CURRENT (µA) V V OUT = 3.3V OUT = 5V –0.04 –0.10 1.5 L = 4.7µH VIN = 12V V –0.06 OUT = 5V BIAS = V V OUT SYNC = 0V ILOAD = 1A IN REGULATION –0.15 –0.08 1.0 0 1 2 3 4 5 6 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8636 G13 8636 G15 8636 G17 Rev. A 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 Package Description Revision History Typical Applications Related Parts
