Datasheet LT3970 (Analog Devices) - 7

LT3970 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Switch VCESAT (ISW = 200mA) Switch On-Time/Switch Off-Time vs Temperature Switch VCESAT
200 250 400 LOAD CURRENT = 175mA 180 160 300 140 200 120 MINIMUM OFF-TIME (mV) (mV) T T 100 CESA CESA 200 80 MINIMUM ON-TIME 150 60 SWITCH V SWITCH V 100 40 SWITCH ON-TIME/SWITCH OFF-TIME (ns) 20 0 100 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 TEMPERATURE (°C) TEMPERATURE (°C) SWITCH CURRENT (mA) 3970 G16 3970 G17 3970 G18
Minimum Input Voltage, Minimum Input Voltage, BOOST Pin Current VOUT = 3.3V VOUT = 5V
16 5.0 6.5 FRONT PAGE APPLICATION FRONT PAGE APPLICATION V V 14 OUT = 3.3V OUT = 5V 4.5 6.0 12 TO START 4.0 5.5 10 TO START/RUN TO RUN 8 3.5 5.0 6 INPUT VOLTAGE (V) INPUT VOLTAGE (V) BOOST PIN CURRENT (mA) 3.0 4.5 4 2 2.5 4.0 0 100 200 300 400 500 0 50 100 150 200 250 300 350 0 50 100 150 200 250 300 350 SWITCH CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3970 G19 3970 G20 3970 G21
Boost Diode Forward Voltage Catch Diode Forward Voltage Catch Diode Leakage
1.2 1.0 20 VR = 12V 1.0 0.8 16 (V) F 0.8 (V) F 0.6 12 0.6 0.4 8 TCH DIODE V BOOST DIODE V 0.4 CA –50°C –50°C CATCH DIODE LEAKAGE (µA) 0.2 25°C 0.2 25°C 4 125°C 125°C 150°C 150°C 0 0 0 0 50 100 150 200 0 100 200 300 400 –50 –25 0 25 50 75 100 125 150 BOOST DIODE CURRENT (mA) CATCH DIODE CURRENT (mA) TEMPERATURE (°C) 3970 G22 3970 G23 3970 G24 Rev. D For more information www.analog.com 7 Document Outline Features Applications Typical Application Description 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 Related Parts