Datasheet LT8614 (Analog Devices) - 4

LT8614
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency at 5VOUT Efficiency at 3.3VOUT Efficiency at 5VOUT
100 100 100 95 95 90 90 90 80 85 85 70 80 80 60 75 75 50 70 70 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 fSW = 1MHz 65 fSW = 1MHz 30 fSW = 1MHz L = 4.7µH L = 2.2µH L = 4.7µH 60 V 60 20 IN = 12V VIN = 12V VIN = 12V 55 VIN = 24V 55 VIN = 24V 10 VIN = 24V VIN = 36V VIN = 36V VIN = 36V 50 50 0 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 0.01 0.1 1 10 100 1000 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (mA) 8614 G01 8614 G02 8614 G03
Burst Mode Efficiency Efficiency at 3.3VOUT Efficiency vs Frequency vs Inductor Value
100 98 95 V VOUT = 5V V 90 OUT = 5V I IN = 12V 96 ILOAD = 1A LOAD = 10mA 90 80 L = 8.6µH 70 94 VIN = 12V 85 60 VIN = 24V 92 50 V 80 IN = 24V 40 90 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 f 75 SW = 1MHz 88 L = 4.7µH 20 VIN = 12V 86 70 10 VIN = 24V VIN = 36V 0 84 65 0.01 0.1 1 10 100 1000 0.25 0.75 1.25 1.75 2.25 2.75 0 2 4 6 8 10 LOAD CURRENT (mA) SWITCHING FREQUENCY (MHz) INDUCTOR VALUE (µH) 8614 G04 8614 G05 8614 G06
Reference Voltage EN Pin Thresholds Load Regulation
0.979 1.03 0.15 VOUT = 5V 0.977 1.02 VIN = 12V 0.10 0.975 1.01 EN RISING 0.973 (%) 0.05 1.00 0.971 OUT 0.99 0 0.969 0.98 0.967 EN THRESHOLD (V) –0.05 REFERENCE VOLAGE (V) CHANGE IN V 0.965 0.97 EN FALLING –0.10 0.963 0.96 0.961 0.95 –0.15 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 4 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8614 G07 8614 G08 8614 G09 Rev. F 4 For more information www.analog.com 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