Datasheet LTC3623 (Analog Devices) - 7

LTC3623
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Switching Frequency/Period vs RT Switch Leakage Current INTVCC Load Regulation
5 3.0 120 5.00 VIN = 15V 2.5 4 4.95 f T 90 SW SW 2.0 PERIOD (µs) 3 4.90 TAGE (V) 1.5 60 MBOT VOL 2 4.85 V CC 1.0 FREQUENCY (MHz) MTOP INT LEAKAGE CURRENT (µA) 30 1 0.5 4.80 0 0 0 4.75 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 RT (kΩ) TEMPERATURE (°C) LOAD CURRENT (mA) 3623 G19 3623 G20 3623 G21
Rising RUN Threshold vs Temperature Start-up Waveform in CCM Start-up Waveform in DCM
1.50 RUN RUN 5V/DIV 5V/DIV 1.45 VOUT(DC) VOUT(DC) 2V/DIV 2V/DIV 1.40 IL IL 2A/DIV 2A/DIV RUN THRESHOLD (V) 1.35 1ms/DIV 3623 G23 1ms/DIV 3623 G24 MODE = INTVCC MODE = OV 1.30 NO PREBIASED VOUT NO PREBIASED VOUT –50 –25 0 25 50 75 100 125 150 VIN = 12V VIN = 12V TEMPERATURE (°C) VOUT = 3.3V VOUT = 3.3V 3623 G22
Prebiased Start-up Waveform Prebiased Start-up Waveform in CCM in DCM VIN Overvoltage
RUN RUN VIN 5V/DIV 5V/DIV 5V/DIV VOUT(DC) VOUT(DC) VOUT 2V/DIV 2V/DIV 1V/DIV IL IL 2A/DIV 2A/DIV SW 10V/DIV 1ms/DIV 3623 G25 1ms/DIV 3623 G26 20ms/DIV 3623 G27 MODE = INTVCC MODE = OV VIN = 12V TO 18V TO 12V VOUT IS PREBIASED TO 2V VOUT IS PREBIASED TO 2V VOUT = 3.3V VIN = 12V VIN = 12V IOUT = 1A VOUT = 3.3V VOUT = 3.3V MODE = CCM 3623fa For more information www.linear.com/LTC3623 7