Datasheet LT1912 (Analog Devices) - 5

LT1912
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Feedback Voltage Switching Frequency Frequency Foldback
840 1.20 1.2 1.15 1.0 820 1.10 0.8 1.05 TAGE (mV) 800 1.00 0.6 0.95 0.4 FEEDBACK VOL 780 FREQUENCY (NORMALIZED) 0.90 0.2 0.85 SWITCHING FREQUENCY (NORMALIZED) 760 0.80 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 TEMPERATURE (°C) TEMPERATURE (°C) FB PIN VOLTAGE (mV) 1912 G09 1912 G10 1912 G11
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 4.0 12 3.5 120 10 3.0 100 8 2.5 80 2.0 6 60 1.5 4 40 1.0 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (µA) MINIMUM SWITCH ON TIME (ns) 20 2 0.5 0 0 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 TEMPERATURE (˚C) RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) 1912 G13 1912 G12 1912 G14
Boost Diode Error Amp Output Current
1.4 50 40 1.2 30 1.0 (V) 20 f 0.8 10 0 0.6 –10 BOOST DIODE V PIN CURRENT (µA) 0.4 V C –20 –30 0.2 –40 0 –50 0 0.5 1.0 1.5 2.0 –200 –100 0 100 200 BOOST DIODE CURRENT (A) FB PIN ERROR VOLTAGE (V) 1912 G15 1912 G16 1912fa 5 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