Datasheet LT3976 (Analog Devices) - 6

LT3976
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Switch VCESAT BOOST Pin Current Minimum On-Time
350 90 200 VSYNC = 0V f 300 80 180 SW = 2MHz 70 250 160 60 200 (mV) 50 140 LOAD = 1A 150 40 120 V CESAT 30 100 100 LOAD = 2.5A BOOST PIN CURRENT (mA) 20 MINIMUM ON-TIME (ns) 50 10 80 LOAD = 5A 0 0 60 0 1 2 3 4 5 0 1 2 3 4 5 –55 –25 5 35 65 95 125 155 SWITCH CURRENT (A) SWITCH CURRENT (A) TEMPERATURE (°C) 3976 G16 3976 G17 3976 G18
RT Programmed Switching Minimum Off-Time Switching Frequency Frequency
250 780 V 350 SYNC = 0V fSW = 2MHz 225 720 300 250 200 660 200 175 LOAD = 5A 600 150 RESISTOR (kΩ) 150 LOAD = 2.5A 540 R T 100 MINIMUM OFF-TIME (ns) 125 SWITCHING FREQUENCY (kHz) 480 LOAD = 1A 50 100 420 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 3976 G19 3976 G20 3976 G21
Internal Undervoltage Lockout Frequency Foldback (UVLO) EN Thresholds
700 6 1.09 EN RISING 1.08 600 5 1.07 500 4 1.06 400 3 1.05 300 1.04 INPUT VOLTAGE (V) 2 EN THRESHOLD (V) 200 1.03 SWITCHING FREQUENCY (kHz) 1 EN FALLING 100 1.02 0 0 1.01 0 0.2 0.4 0.6 0.8 1 1.2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FB PIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3976 G22 3976 G23 3976 G24 3976f 6 For more information www.linear.com/3976 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 Typical Application Related Parts