Datasheet LT1943 (Analog Devices) - 5

LT1943
W U TYPICAL PERFOR A CE CHARACTERISTICS MINIMUM Input Voltage to Start, VLOGIC = 3.3V BOOST Pin Current SW2 Current Limit
6.0 100 5.0 TA = 25°C TA = 25°C 5.5 80 4.5 5.0 60 4.0 4.5 40 3.5 4.0 SW2 CURRENT (A) INPUT VOLTAGE (V) BOOST PIN CURRENT (mA) 20 3.0 3.5 0 2.5 3.0 0 20 40 60 80 100 0 0.5 1.0 1.5 2.0 2.5 3.0 –50 –25 0 25 50 75 100 125 LOAD CURRENT (mA) SW1 CURRENT (A) TEMPERATURE (°C) 1943 G05 1943 G06 1943 G04
SW3 Current Limit SW4 Current Limit SW1 VCESAT
0.8 0.8 600 TA = 25°C 0.7 0.7 500 0.6 0.6 400 0.5 0.5 300 0.4 0.4 200 SW3 CURRENT (A) SW4 CURRENT (A) SW1 VOLTAGE DROP (mV) 0.3 0.3 100 0.2 0.2 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 0.5 1.0 1.5 2.0 2.5 3.0 SW1 CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 1943 G09 1943 G07 1943 G08
SW3 V SW4 V SW2 V CESAT CESAT CESAT
600 500 500 T T A = 25°C A = 25°C TA = 25°C 500 400 400 400 300 300 300 200 200 200 SW3 VOLTAGE DROP (mV) SW4 VOLTAGE DROP (mV) SW2 VOLTAGE DROP (mV) 100 100 100 0 0 0 0 2.5 3.0 0 0.1 0.2 0.3 0.5 1.0 1.5 2.0 0.4 0 0.1 0.2 0.3 0.4 SW2 CURRENT (A) SW3 CURRENT (A) SW4 CURRENT (A) 1943 G11 1943 G12 1943 G10 1943fa 5