Datasheet LT1738 (Analog Devices) - 4

LT1738
W U TYPICAL PERFOR A CE CHARACTERISTICS Feedback Voltage and Input Negative Feedback Voltage and Current vs Temperature Input Current vs Temperature
1.260 750 2.480 3.2 1.258 700 2.485 3.0 1.256 650 FB INPUT CURRENT (nA) NFB INPUT CURRENT ( 2.490 2.8 1.254 600 2.495 2.6 1.252 550 1.250 500 2.500 2.4 1.248 450 2.505 2.2 1.246 400 µ FEEDBACK VOLTAGE (V) A) 2.510 2.0 1.244 350 NEGATIVE FEEDBACK VOLTAGE (V) 2.515 1.8 1.242 300 1.240 250 2.520 1.6 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) 1738 G01 1738 G02
Feedback Overvoltage Shutdown Error Amp Transconductance vs Error Amp Output Current vs vs Temperature Temperature Feedback Pin Voltage from Nominal
1.70 2000 500 1.65 1900 400 –40°C 1.60 1800 300 1.55 µmho) 1700 200 25°C 1.50 1600 µA) 100 125°C 1.45 1500 0 1.40 1400 –100 CURRENT ( 1.35 1300 –200 FEEDBACK VOLTAGE (V) 1.30 TRANSCONDUCTANCE ( 1200 –300 1.25 1100 –400 1.20 1000 –500 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –400 –300 –200 –100 0 100 200 300 400 TEMPERATURE (°C) TEMPERATURE (°C) FEEDBACK PIN VOLTAGE FROM NOMINAL (mV) 1738 G03 1738 G04 1738 G05
VC Pin Threshold and Clamp CS Pin Trip Voltage and CS Fault SHDN Pin On and Off Thresholds Voltage vs Temperature Voltage vs Temperature vs Temperature
1.4 1.50 240 CLAMP 1.2 220 FAULT 1.45 1.0 200 ON 180 1.40 0.8 160 0.6 1.35 PIN VOLTAGE (V) 140 CV 0.4 CS PIN VOLTAGE (mV) THRESHOLD 120 SHDN PIN VOLTAGE (V) TRIP 1.30 0.2 100 OFF 0 80 1.25 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1738 G06 1738 G07 1738 G08 1738fa 4