Datasheet LT3680 (Analog Devices) - 5

LT3680
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Switch Voltage Drop Boost Pin 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 4 5 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (A) SWITCH CURRENT (A) TEMPERATURE (°C) 3680 G10 3680 G11 3680 G12
Switching Frequency Frequency Foldback Minimum Switch On-Time
1.20 1200 140 1.15 1000 120 1.10 100 800 1.05 80 1.00 600 60 0.95 FREQUENCY (MHz) 400 40 0.90 SWITCHING FREQUENCY (kHz) 200 MINIMUM SWITCH ON TIME (ns) 20 0.85 0.80 0 0 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) FB PIN VOLTAGE (mV) TEMPERATURE (°C) 3680 G13 3680 G14 3680 G15
Soft-Start RUN/SS Pin Current Boost Diode
7 12 1.4 6 1.2 10 5 1.0 8 (V) F 4 0.8 6 3 0.6 4 BOOST DIODE V 2 0.4 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (µA) 1 2 0.2 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 0 0.5 1.0 1.5 2.0 RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) BOOST DIODE CURRENT (A) 3680 G16 3680 G17 3680 G18 Rev C For more information www.analog.com 5 Document Outline Features Applications Description 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