Datasheet LT8642S (Analog Devices) - 4

LT8642S
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 1VOUT Efficiency 12VIN to 1.2VOUT Efficiency
100 3.2 100 3.2 VBIAS = 3.3V 1MHz, L = 0.56µH (2.6mΩ) L = XEL6030, 0.28µH (DCR = 2.1mΩ) 95 2.8 95 2MHz, L = 0.28µH (2.1mΩ) 2.8 90 2.4 90 2.4 POWER LOSS (W) POWER LOSS (W) 85 2.0 85 EFFICIENCY 2.0 EFFICIENCY 80 1.6 80 1.6 75 1.2 EFFICIENCY (%) 75 1.2 EFFICIENCY (%) POWER LOSS POWER LOSS 70 0.8 70 0.8 65 1MHz 0.4 65 V 0.4 BIAS = 3.3V 2MHz L = XEL6060, XEL6030 60 0 60 0 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT (A) LOAD CURRENT (A) 8642S G01 8642S G02
12VIN to 3.3VOUT Efficiency Efficiency vs VIN
100 3.2 96 95 2.8 94 EFFICIENCY 90 2.4 92 POWER LOSS (W) 85 2.0 90 80 1.6 88 75 1.2 EFFICIENCY (%) 86 EFFICIENCY (%) POWER LOSS 70 VBIAS = VOUT 0.8 84 VOUT = 1.2V L = XEL6060 fSW = 2MHz 65 1MHz, L = 1.5µH (4.3mΩ) 0.4 82 ILOAD = 5A 2MHz, L = 0.82µH (3mΩ) L = XEL6060, 1µH (DCR = 3.7mΩ) 60 0 80 0 1 2 3 4 5 6 7 8 9 10 3 6 9 12 15 18 LOAD CURRENT (A) INPUT VOLTAGE (V) 8642S G03 8642S G04
12VIN to 1.2VOUT Low Load Efficiency Efficiency vs Frequency Reference Voltage
100 100 606 90 604 95 80 602 70 90 600 60 TAGE (mV) 598 50 85 596 40 EFFICIENCY (%) EFFICIENCY (%) 80 594 30 Burst Mode OPERATION VIN = 12V 20 REFERENCE VOL 592 V V IN = 12V, VBIAS = 3.3V 75 OUT = 1.2V f I 10 SW = 2MHz LOAD = 5A 590 L = XEL6030, 0.28µH (DCR = 2.1mΩ) L = XEL6060, 2.2µH (DCR = 6.1mΩ) 0 70 588 0.1 1 10 100 1000 0 0.5 1 1.5 2 2.5 3 –50 –25 0 25 50 75 100 125 LOAD CURRENT (mA) SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) 8642S G05 8642S G06 8642S G07 Rev 0 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Applications Related Parts