Datasheet LT3973, LT3973-3.3, LT3973-5 (Analog Devices) - 7

LT3973/LT3973-3.3/LT3973-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Input Voltage, Switch VCESAT BOOST Pin Current VOUT = 3.3V
600 25 5.0 FRONT PAGE APPLICATION VOUT = 3.3V 500 20 4.5 (mV) 400 15 4.0 CESAT 300 TO START/TO RUN 10 3.5 200 SWITCH V INPUT VOLTAGE (V) BOOST PIN CURRENT (mA) 5 100 3.0 0 0 2.5 0 200 400 600 800 1000 1200 0 200 400 600 800 1000 1200 0 100 200 300 400 500 600 700 SWITCH CURRENT (mA) SWITCH CURRENT (mA) LOAD CURRENT (mA) 3973 G19 3973 G20 3973 G21
Minimum Input Voltage, Start-Up and Dropout VOUT = 5V Performance Minimum Input Voltage to Switch
6.5 9 4.0 FRONT PAGE APPLICATION FRONT PAGE APPLICATION VOUT = 5V 8 6.0 7 V 3.5 IN 6 5.5 TO START/TO RUN 5 VOUT 3.0 4 5.0 VOLTAGE (V) INPUT VOLTAGE (V) 3 INPUT VOLTAGE (V) 2.5 4.5 2 1 4.0 0 2.0 0 100 200 300 400 500 600 700 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) TIME TEMPERATURE (°C) 3973 G23 3973 G22 3973 G24
VFB Regulation Voltage Boost Diode Forward Voltage Catch Diode Forward Voltage
1.4 1.2 1.0 1.0 0.8 1.2 (V) F 0.8 (V) F 0.6 (V) 1.0 0.6 V FB 0.4 TCH DIODE, V BOOST DIODE V 0.4 CA 0.8 150°C 150°C 0.2 125°C 0.2 125°C 25°C 25°C –50°C –50°C 0.6 0 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 50 100 150 200 0 200 400 600 800 1000 1200 INPUT VOLTAGE (V) BOOST DIODE CURRENT (mA) CATCH DIODE CURRENT (mA) 3973 G25 3973 G26 3973 G27 3973fb For more information www.linear.com/LT3973 7 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