Datasheet LTC3727A-1 (Analog Devices) - 6

LTC3727A-1
TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage vs Output Current SENSE Pins Total Source Current (Figure 13) RUN/SS Current vs Temperature
100 1.4 1.8 VOUT = 5V 50 1.6 1.2 0 1.4 –50 1.0 R 1.2 SENSE = 0.015Ω –100 0.8 (μA) 1.0 –150 0.6 0.8 I SENSE –200 0.6 –250 0.4 DROPOUT VOLTAGE (V) RUN/SS CURRENT (μA) 0.4 –300 0.2 –350 R 0.2 SENSE = 0.010Ω –400 0 0 0 5 10 15 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 VSENSE COMMON MODE VOLTAGE (V) OUTPUT CURRENT (A) TEMPERATURE (°C) 3727 G13 3727 G14 3727 G15
Soft-Start Up (Figure 13) Load Step (Figure 13) Load Step (Figure 13)
IOUT* VOUT VOUT 5A/DIV 200mV/DIV 200mV/DIV VOUT 5V/DIV VRUN/SS I IOUT* 5V/DIV OUT* 2A/DIV 2A/DIV 3727 G16 3727 G17 3727 G18 50ms/DIV 50μs/DIV 50μs/DIV VIN = 20V VIN = 15V VIN = 15V VOUT = 12V VOUT = 12V VOUT = 12V LOAD STEP = 0A TO 3A LOAD STEP 0A TO 3A Burst Mode OPERATION CONTINUOUS MODE
Input Source/Capacitor Constant Frequency (Burst Inhibit) Instantaneous Current (Figure 13) Burst Mode Operation (Figure 13) Operation (Figure 13)
IIN V 1A/DIV OUT VOUT 20mV/DIV 20mV/DIV VSW1 20V/DIV V I SW2 IOUT* OUT* 20V/DIV 0.5A/DIV 0.5A/DIV 3727 G19 3727 G20 3727 G21 1μs/DIV 50μs/DIV 5μs/DIV VIN = 15V VIN = 15V VIN = 15V VOUT1 = 12V VOUT = 12V VOUT = 12V VOUT2 = 5V VFCB = OPEN VFCB = 7.5V IOUT1 = IOUT2 = 2A IOUT = 20mA IOUT = 20mA 3727a1fa 6