Datasheet LTC1625 (Analog Devices) - 5

LTC1625
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum Current Sense Voltage Maximum Current Sense Voltage Oscillator Frequency vs Duty Cycle vs Temperature vs Temperature
200 160 300 250 SYNC = 1.5V 150 155 200 SYNC = 0V 100 150 150 FREQUENCY (kHz) 100 50 145 50 MAXIMUM CURRENT SENSE VOLTAGE (mV) MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 140 0 0 0.2 0.4 0.5 0.8 1.0 – 40 –15 10 35 60 85 110 135 – 40 –15 10 35 60 85 110 135 DUTY CYCLE TEMPERATURE (°C) TEMPERATURE (°C) 1625 G10 1625 G11 1625 G12
RUN/SS Pin Current Soft Start: FCB Pin Current vs Temperature vs Temperature Load Current vs Time
0 0 INDUCTOR – 0.25 – 1 CURRENT 2A/DIV µA) µA) –0.50 – 2 RUN/SS – 0.75 2V/DIV – 3 FCB CURRENT ( –1.00 RUN/SS CURRENT ( 20ms/DIV 1625 F06 V – 4 IN = 20V –1.25 VOUT = 5V RLOAD = 1Ω FIGURE 1 CIRCUIT –1.50 – 5 – 40 –15 10 35 60 85 110 135 –40 –15 10 35 60 85 110 135 TEMPERATURE (°C) TEMPERATURE (°C) 1625 G13 1625 G14
Transient Response Transient Response (Burst Mode Operation) Burst Mode Operation
VOUT 50mV/DIV VOUT VOUT 50mV/DIV 50mV/DIV ITH 100mV/DIV 200µs/DIV 1625 F07 500µs/DIV 1625 F08 50µs/DIV V 1625 F09 IN = 20V V V IN = 20V IN = 20V VOUT = 5V V V OUT = 5V OUT = 5V ILOAD = 1A TO 4A I I LOAD = 50mA TO 1A LOAD = 50mA FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT 5