Datasheet LT3995 (Analog Devices) - 5

LT3995
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Thermal Derating Thermal Derating Switch Current Limit
3.5 3.5 7.0 LIMITED BY MAXIMUM JUNCTION LIMITED BY MAXIMUM JUNCTION TEMPERATURE θJA = 40°C/W TEMPERATURE θJA = 40°C/W 3.0 3.0 6.5 2.5 2.5 6.0 2.0 2.0 H-GRADE H-GRADE 5.5 12VIN 12VIN 1.5 24VIN 1.5 24VIN 36V 36V LOAD CURRENT (A) IN IN 48V LOAD CURRENT (A) 48V CURRENT LIMIT (A) 5.0 1.0 IN 1.0 IN 60VIN 60VIN VOUT = 3.3V VOUT = 5V 4.5 0.5 0.5 fSW = 300kHz fSW = 500kHz 2.5in × 2.5in 4-LAYER BOARD 2.5in × 2.5in 4-LAYER BOARD 0 0 4.0 0 25 50 75 100 125 150 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1.0 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE 3995 G10 3995 G38 3995 G11
Switch Current Limit Current Limit Foldback Soft-Start
7.0 7 7 30% DUTY CYCLE 30% DUTY CYCLE 30% DUTY CYCLE V VFB = 1V SS = 3V 6.5 6 6 5 5 6.0 VFB = 0.2V 4 4 5.5 3 3 CURRENT LIMIT (A) 5.0 CURRENT LIMIT (A) 2 CURRENT LIMIT (A) 2 4.5 1 1 4.0 0 0 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.5 1 1.5 2 2.5 TEMPERATURE (°C) FB PIN VOLTAGE (V) SS PIN VOLTAGE (V) 3995 G12 3995 G13 3995 G14
Switch VCESAT BOOST Pin Current Minimum On-Time
300 70 225 VSYNC = 0V fSW = 2MHz 250 60 200 50 200 175 40 LOAD = 1A 150 150 30 LOAD = 2A SWITCH DROP (mV) 100 125 20 BOOST PIN CURRENT (mA) MINIMUM ON-TIME (ns) 50 10 100 0 0 75 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 SWITCH CURRENT (A) SWITCH CURRENT (A) TEMPERATURE (°C) 3995 G15 3995 G16 3995 G17 3995f For more information www.linear.com/LT3995 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts