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LTC3809EDD-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3809EDD-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 24 page LTC3809 4 3809fc TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current Maximum Current Sense Voltage vs ITH Pin Voltage Load Step (Burst Mode Operation) Load Step (Pulse-Skipping Mode) Start-Up with Internal Soft-Start TA = 25°C unless otherwise noted. LOAD CURRENT (mA) 100 90 80 70 95 85 75 65 60 1 100 1k 10k 3809 G01 10 VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.2V FIGURE 10 CIRCUIT SYNC/MODE = VIN VIN = 5V LOAD CURRENT (mA) 100 90 80 70 95 85 75 65 50 55 60 3809 G02 1 100 1k 10k 10 FIGURE 10 CIRCUIT VIN = 5V, VOUT = 2.5V FORCED CONTINUOUS (SYNC/MODE = 0V) PULSE SKIPPING (SYNC/MODE = 0.6V) BURST MODE (SYNC/MODE = VIN) ITH VOLTAGE (V) 0.5 –20 0 20 40 60 100 1 1.5 3809 G03 2 80 Burst Mode OPERATION (ITH RISING) Burst Mode OPERATION (ITH FALLING) FORCED CONTINUOUS MODE PULSE SKIPPING MODE Efficiency vs Load Current VOUT 200mV/DIV AC COUPLED IL 2A/DIV 100μs/DIV VIN = 3.3V VOUT = 1.8V ILOAD = 300mA TO 3A SYNC/MODE = VIN FIGURE 10 CIRCUIT 3809 G04 VOUT 200mV/DIV AC COUPLED IL 2A/DIV 100μs/DIV VIN = 3.3V VOUT = 1.8V ILOAD = 300mA TO 3A SYNC/MODE = 0V FIGURE 10 CIRCUIT 3809 G05 Load Step (Forced Continuous Mode) VOUT 200mV/DIV AC COUPLED IL 2A/DIV 100μs/DIV VIN = 3.3V VOUT = 1.8V ILOAD = 300mA TO 3A SYNC/MODE = VFB FIGURE 10 CIRCUIT 3809 G06 VOUT 1.8V 500mV/DIV 200μs/DIV VIN = 4.2V RLOAD = 1Ω FIGURE 10 CIRCUIT 3809 G07 |
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