Datasheet LT8698S, LT8698S-1 (Analog Devices) - 8

LT8698S/LT8698S-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VIN = 12V unless otherwise noted. No Load Input Current Bottom FET Positive Current Limit Bottom FET Positive Current vs Temperature Top FET Current Limit T vs Temperature Limit vs Temperature
32 8.0 8.0 10% DC VIN = 12V 28 L = 2.2µH 7.5 50% DC 7.5 RT = 9.09k 24 7.0 7.0 20 6.5 6.5 SYNC/MODE = FLOAT (mA) 16 6.0 6.0 SYNC/MODE = OPEN I VIN 12 5.5 5.5 CURRENT LIMIT (A) CURRENT LIMIT (A) 8 5.0 5.0 4 4.5 4.5 0 4.0 4.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8698S G10 8698S G11 8698S G12
Top FET Negative Current Limit Top FET/ Bottom FET Drop op FET / Bottom FET Drop Top FET Minimum On-T T ime op FET Minimum On–T
–1.00 400 30 ISW = 3A –1.25 350 ISW = 2A 29 ISW = 1A –1.50 300 28 –1.75 250 27 –2.00 200 (ns) 26 T ON –2.25 150 SW DROP (mV) 25 CURRENT LIMIT (A) –2.50 100 24 –2.75 30% DC 50 IBUS = 2.65A 23 50% DC IBUS = 6A –3.00 0 22 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8698S G14 8698S G14 8698S G15
Minimum Off-T Minimum Off–Time ime Switching Frequency Switching Frequency vs Temperature VIN - VBUS Dropout VIN – VBUS Dropout vs Temperature vs T
60 600 2.20 L = XAL5030–222, RSEN = 10mΩ RT = 9.09k 525 2.15 55 450 2.10 50 375 2.05 I 45 300 BUS = 2.5A 2.00 IBUS = 1A I 225 BUS = 0A DROPOUT (mV) 1.95 40 FREQUENCY (MHz) MINIMUM OFF–TIME (ns) 150 1.90 35 75 IBUS = 2.5A 1.85 IBUS = 0A 30 0 1.80 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8698S G16 8698S G17 8698S G18 Rev. A 8 For more information www.analog.com 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 Related Parts