Datasheet LTC1773 (Analog Devices) - 4

LTC1773
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum Current Sense Maximum Current Sense Maximum Current Sense Threshold vs VRUN/SS Threshold vs Temperature Threshold vs VITH
120 105 120 100 100 80 100 80 60 60 Burst Mode OPERATION 40 95 40 20 20 FORCED CONTINUOUS MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 85 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 – 60 – 40 – 20 0 20 40 60 80 100 120 140 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 VRUN/SS (V) TEMPERATURE (°C) VITH (V) 1773 G07 1773 G08 1773 G09
Oscillator Frequency vs RUN/SS Pin Current vs Temperature Temperature Burst Mode Operation
560 2.5 ILOAD = 100mA SEE FIGURE 9 V 550 2.0 OUT µA) 20mV/DIV 540 1.5 FREQUENCY (kHz) IL 500mA/DIV 530 RUN/SS CURRENT ( 1.0 520 0.5 1773 G12 – 60 –40 –20 0 20 40 60 80 100 120 140 – 60 –40 –20 0 20 40 60 80 100 120 140 VIN = 5V 20µs/DIV V TEMPERATURE (°C) TEMPERATURE (°C) OUT = 2.5V 1773 G10 1773 G11
Load Step (Burst Mode Load Step (Continuous Start-Up Operation) Mode)
SEE FIGURE 9 SEE FIGURE 9 SEE FIGURE 9 VOUT 2V/DIV VOUT VOUT 100mV/DIV 100mV/DIV VRUN/SS 1V/DIV I I L L IL 2A/DIV 2A/DIV 2A/DIV 1773 G14 1773 G13 V V 100µs/DIV 1773 G15 IN = 5V 40ms/DIV IN = 5V VIN = 5V 100µs/DIV V V OUT = 2.5V OUT = 2.5V VOUT = 2.5V 100mA TO 5A LOAD STEP 100mA TO 5A LOAD STEP 1773fb 4