Datasheet LT1952, LT1952-1 (Analog Devices) - 6

LT1952/LT1952-1
TYPICAL PERFORMANCE CHARACTERISTICS Switching Frequency VIN Shutdown Current FB Voltage vs Temperature vs Temperature vs Temperature
1.25 245 500 VIN = 15V 450 SD_VSEC = 0V 230 1.24 400 215 1.23 350 200 300 1.22 FB VOLTAGE (V) 250 185 SHUTDOWN CURRENT (µA) 200 1.21 SWITCHING FREQUENCY (kHz) 170 V IN 150 1.20 155 100 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1952 G01 1952 G02 1952 G03
VIN Start-up Current SD_VSEC Turn ON Threshold vs Temperature VIN IQ vs Temperature vs Temperature
600 6.5 1.42 SD_VSEC = 1.4V OC = OPEN 550 6.0 500 1.37 LT1952 5.5 450 400 (mA) 5.0 1.32 I Q 350 V IN LT1952-1 4.5 TURN ON THRESHOLD (V) STARTUP CURRENT (µA) 300 SEC 1.27 V IN 4.0 250 SD_V 200 3.5 1.22 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1952 G04 1952 G05 1952 G06
SD_VSEC Pin Current VIN Turn ON/OFF Voltage COMP Active Threshold vs Temperature vs Temperature vs Temperature
15 18 1.6 RISENSE = 0k 1.4 PIN CURRENT BEFORE 16 PART TURN ON LT1952 VIN TURN ON VOLTAGE 1.2 10 14 1.0 (V) 12 0.8 V IN PIN CURRENT (µA) COMP (V) 0.6 SEC 5 10 LT1952 VIN TURN OFF VOLTAGE 0.4 SD_V 8 0mA PIN CURRENT AFTER 0.2 PART TURN ON LT1952-1 VIN ON LT1952-1 VIN OFF 0 6 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1952 G07 1952 G08 1952 G09 19521fe 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Timing Diagram Block Diagram Operation Applications Information Typical Applications Revision History Package Description Related Parts