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LTC3736EUF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3736EUF Datasheet(HTML) 4 Page - Linear Technology |
4 / 28 page 4 LTC3736 3736f TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Load Current LOAD CURRENT (mA) 65 95 100 60 55 90 75 85 80 70 1 100 1000 10000 3736 G01 50 10 VIN = 5V SYNC/FCB = VIN VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.2V FIGURE 15 CIRCUIT VOUT AC-COUPLED 100mV/DIV VIN = 3.3V VOUT = 1.8V ILOAD = 300mA TO 3A SYNC/FCB = VIN FIGURE 17 CIRCUIT 100 µs/DIV 3736 G02 IL 2A/DIV VOUT AC-COUPLED 100mV/DIV VIN = 3.3V VOUT = 1.8V ILOAD = 300mA TO 3A SYNC/FCB = 0V FIGURE 17 CIRCUIT 100 µs/DIV 3736 G03 IL 2A/DIV Load Step (Burst Mode Operation) Load Step (Forced Continuous Mode) Load Step (Pulse Skipping Mode) VOUT AC-COUPLED 100mV/DIV VIN = 3.3V VOUT = 1.8V ILOAD = 300mA TO 3A SYNC/FCB = 550kHz EXTERNAL CLOCK FIGURE 17 CIRCUIT 100 µs/DIV 3736 G04 IL 2A/DIV Burst Mode OPERATION SYNC/FCB = VIN FORCED CONTINUOUS MODE SYNC/FCB = 0V VIN = 3.3V VOUT = 1.8V ILOAD = 200mA FIGURE 17 CIRCUIT 4 µs/DIV 3736 G05 PULSE SKIPPING MODE SYNC/FCB = 550kHz IL 1A/DIV VIN = 5V RLOAD1 = RLOAD2 = 1Ω FIGURE 15 CIRCUIT 200 µs/DIV 3736 G06 500mV/ DIV VOUT1 2.5V VOUT2 1.8V Inductor Current at Light Load Tracking Start-Up with Internal Soft-Start (CSS = 0µF) VIN = 5V RLOAD1 = RLOAD2 = 1Ω FIGURE 15 CIRCUIT 40ms/DIV 3736 G07 500mV/ DIV VOUT1 2.5V VOUT2 1.8V INPUT VOLTAGE (V) 2 –5 –4 –2 –1 0 5 2 4 6 7 3736 G08 –3 3 4 1 35 8 9 10 Oscillator Frequency vs Input Voltage Tracking Start-Up with External Soft-Start (CSS = 0.15µF) TA = 25°C unless otherwise noted. |
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