Datasheet LT3481 (Analog Devices) - 5

LT3481
TYPICAL PERFORMANCE CHARACTERISTICS Switch Voltage Drop BOOST Pin Current Feedback Voltage
700 90 1.290 80 1.285 600 70 1.280 500 60 1.275 TAGE (V) 400 50 1.270 40 300 TAGE DROP (mV) 1.265 30 VOL 200 FEEDBACK VOL 1.260 BOOST PIN CURRENT (mA) 20 100 10 1.255 0 0 1.250 0 500 1000 1500 2000 2500 3000 3500 0 500 1000 1500 2000 2500 3000 3500 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (mA) SWITCH CURRENT (mA) TEMPERATURE (°C) 3481 G10 3481 G11 4381 G12
Switching Frequency Frequency Foldback Minimum Switch On-Time
1.20 1200 140 RT = 45.3k RT = 45.3k 1.15 120 1000 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) 0.85 20 0.80 0 0 –50 –25 0 25 50 75 100 125 150 0 200 400 600 800 1000 1200 1400 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) FB PIN VOLTAGE (mV) TEMPERATURE (˚C) 4381 G13 3481 G14 3481 G15
Soft-Start RUN/SS Pin Current Boost Diode
4.0 12 1.6 3.5 1.4 10 3.0 1.2 8 (V) f 2.5 1.0 2.0 6 0.8 1.5 0.6 4 BOOST DIODE V 1.0 0.4 RUN/SS PIN CURRENT (μA) SWITCH CURRENT LIMIT (A) 2 0.5 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) 3481 G16 3481 G17 3481 G18 3481fc 5