Datasheet LT3980 (Analog Devices) - 5

LT3980
Typical perFormance characTerisTics TA = 25°C unless otherwise noted. Boost Pin Current Switch Voltage Drop vs Switch Current Feedback Voltage
700 120 840 105 600 90 820 500 75 400 60 800 300 45 VOLTAGE DROP (mV) 200 BOOST PIN CURRENT (mA) 30 FEEDBACK VOLTAGE (mV) 780 100 15 0 0 760 0 1 2 3 0 1 2 3 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (A) SWITCH CURRENT (A) TEMPERATURE (°C) 3980 G10 3980 G12 3980 G11
Switching Frequency Frequency Foldback RT vs Frequency
1.20 1200 3500 1.15 3000 1000 1.10 2500 800 1.05 2000 1.00 600 1500 0.95 FREQUENCY (MHz) 400 1000 0.90 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 200 500 0.85 RF = 32.4k 0.80 0 0 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 1 10 100 1000 TEMPERATURE (°C) FB PIN VOLTAGE (mV) RESISTANCE (kΩ) 3880 G13 3980 G14 3980 G15
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
240 7 24 220 6 20 5 200 16 4 180 12 160 3 8 140 2 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (µA) MINIMUM SWITCH ON-TIME (ns) 120 1 4 ILOAD = 1A 100 0 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 0 10 20 30 40 50 60 TEMPERATURE (°C) RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) 3980 G16 3980 G17 3980 G18 3980fa For more information www.linear.com/LT3980 5 Document Outline Features Description Applications 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 Revision History Typical Application Related Parts