Datasheet LT1941 (Analog Devices) - 6

LT1941
TYPICAL PERFORMANCE CHARACTERISTICS BOOST1 Pin Current VFB3 vs Temperature VFB1, VFB2 vs Temperature
50 1.280 0.645 TA = 25°C 40 1.265 0.635 30 (V) 1.250 (V) 0.625 FB FB V V 20 BOOST CURRENT (mA) 1.235 0.615 10 0 1.220 0.605 0 0.5 1 1.5 2 2.5 3 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SW1 PIN CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 1941 G04 1941 G05 1941 G12
Switching Frequency Frequency vs Temperature vs % of Feedback Voltage IRUN/SS vs Temperature
1.3 1.2 3.0 TA = 25°C 1.0 2.5 1.2 0.8 2.0 1.1 0.6 1.5 FREQUENCY (MHz) 0.4 1.0 RUN/SS CURRENT (μA) 1.0 SWITCHING FREQUENCY (MHz) 0.2 0.5 0.9 0 0 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) % OF FEEDBACK VOLTAGE TEMPERATURE (°C) 1941 G14 1941 G13 1941 G15
RUN/SS Thresholds Minimum Input Voltage Minimum Input Voltage vs Temperature VOUT2 = 5V VOUT2 = 3.3V
1.4 8.0 6.0 DBOOST = CMDSH-3 DBOOST = CMDSH-3 TA = 25°C T 1.2 A = 25°C 7.5 5.5 VIN TO START BOOST DIODE 1.0 VIN TO START BOOST DIODE TIED TO 7.0 TIED TO 5.0 OUTPUT TO SWITCH OUTPUT 0.8 BOOST DIODE 6.5 BOOST DIODE 4.5 TIED TO 0.6 TIED TO INPUT TO RUN INPUT 6.0 4.0 V 0.4 IN TO RUN RUN/SS THRESHOLDS (V) VIN TO RUN MINIMUM INPUT VOLTAGE (V) MINIMUM INPUT VOLTAGE (V) 0.2 5.5 3.5 0 5.0 3.0 –50 –25 0 25 50 75 100 125 1 10 100 1000 1 10 100 1000 TEMPERATURE (°C) LOAD CURRENT (mA) LOAD CURRENT (mA) 1941 G16 1941 G17 1941 G18 1941fb 6