Datasheet LT3973, LT3973-3.3, LT3973-5 (Analog Devices) - 6

LT3973/LT3973-3.3/LT3973-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Load Current Maximum Load Current Maximum Load Current
1.6 1.5 1.4 H-GRADE LIMITED BY CURRENT LIMIT 1.4 TYPICAL TYPICAL 1.2 1.2 1.2 1.0 MINIMUM MINIMUM 1.0 0.9 0.8 LIMITED BY MAXIMUM 0.8 JUNCTION TEMPERATURE; 0.6 θJA = 45°C/W 0.6 0.6 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 0.4 0.4 0.3 FRONT PAGE APPLICATION 0.2 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 0.2 VIN = 12V VOUT = 3.3V VOUT = 5V VOUT = 5V 0 0 0 5 10 15 20 25 30 35 40 45 5 10 15 20 25 30 35 40 45 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) INPUT VOLTAGE (V) TEMPERATURE (°C) 3973 G10 3973 G11 3973 G12
Load Regulation Switch Current Limit Switch Current Limit
0.25 2.0 2.0 0.20 1.8 1.8 0.15 SWITCH PEAK CURRENT LIMIT SWITCH PEAK 0.10 1.6 CURRENT LIMIT 1.6 0.05 1.4 1.4 0 –0.05 1.2 1.2 CATCH DIODE VALLEY CURRENT LIMIT LOAD REGULATION (%) –0.10 SWITCH CURRENT LIMIT (A) CATCH DIODE VALLEY CURRENT LIMIT SWITCH CURRENT LIMIT (A) 1.0 1.0 –0.15 FRONT PAGE APPLICATION REFERENCED FROM VOUT AT 100mA LOAD –0.20 0.8 0.8 0 100 200 300 400 500 600 700 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) DUTY CYCLE (%) TEMPERATURE (°C) 3973 G13 3973 G14 3973 G15
Switch VCESAT (ISW = 500mA) Switching Frequency Minimum Switch On-Time vs Temperature
2.4 150 350 LOAD CURRENT = 375mA 2.2 2.0 125 1.8 1.6 100 300 (mV) 1.4 T 1.2 75 CESA 1.0 FREQUENCY (MHz) 0.8 50 250 SWITCH V 0.6 SWITCH ON-TIME (ns) 0.4 25 0.2 0 0 200 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3973 G16 3973 G17 3973 G18 3973fb 6 For more information www.linear.com/LT3973 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