Datasheet LT1961 (Linear Technology) - 4

LT1961
W U TYPICAL PERFORMANCE CHARACTERISTICS FB vs Temperature Switch On Voltage Drop Oscillator Frequency
1.22 400 1.5 T 125°C A = 25°C 350 1.21 300 25°C 1.4 250 1.20 200 –40°C 1.3 FB VOLTAGE (V) 150 FREQUENCY (MHz) 1.19 SWITCH VOLTAGE (mV) 100 1.2 50 1.18 0 1.1 –50 –25 0 25 50 75 100 125 0 0.5 1 1.5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 1961 G01 1961 G02 1961 G03
SHDN Threshold vs Temperature SHDN Supply Current vs VIN SHDN IP Current vs Temperature
1.40 7 –12 TA = 25°C SHDN = 0V 6 1.38 –10 5 SHUTTING DOWN μA) μA) –8 1.36 4 –6 3 1.34 CURRENT ( INV SHDN INPUT ( –4 STARTING UP SHDN THRESHOLD (V) 2 1.32 1 –2 1.30 0 0 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 30 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) VIN (V) TEMPERATURE (°C) 1961 G04 1961 G05 1961G06
SHDN Supply Current Input Supply Current Current Limit Foldback
300 1200 2.0 40 TA = 25°C TA = 25°C TA = 25°C VIN = 15V 250 1000 FB INPUT CURRENT ( 1.5 30 μA) 200 μA) 800 MINIMUM SWITCH CURRENT INPUT 150 600 VOLTAGE 1.0 20 CURRENT ( CURRENT ( INV 100 INV 400 μA) 0.5 10 SWITCH PEAK CURRENT (A) 50 200 FB CURRENT 0 0 0 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 5 10 15 20 25 30 0 0.2 0.4 0.6 0.8 1 1.2 SHUTDOWN VOLTAGE (V) INPUT VOLTAGE (V) FEEDBACK VOLTAGE (V) 1961 G07 1961 G08 1961 G09 1961fa 4