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LTC3879 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3879 Datasheet(HTML) 5 Page - Linear Technology |
5 / 28 page LTC3879 5 3879f TYPICAL PERFORMANCE CHARACTERISTICS Transient Response FCM (Forced Continuous Mode) Transient Response FCM Positive Load Step Transient Response FCM Negative Load Step Transient Response DCM (Discontinuous Mode) Normal Start-Up, RUN Pin Released from GND Start-Up Into a Pre-Biased Output RUN Pin Released from GND Coincident Rail Tracking 1.2V VOUT Tracks External 1.8V Supply VOUT (AC) 50mV/DIV IL 10A/DIV ILOAD 10A/DIV 50μs/DIV LOAD STEP 0A TO 10A TO 0A VIN = 12V VOUT = 1.2V MODE = 0V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G01 VOUT (AC) 50mV/DIV VSW 20V/DIV IL 10A/DIV ILOAD 10A/DIV 5μs/DIV LOAD STEP 0A TO 10A VIN = 12V VOUT = 1.2V MODE = 0V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G02 VOUT (AC) 50mV/DIV VSW 20V/DIV IL 10A/DIV ILOAD 10A/DIV 5μs/DIV LOAD STEP 10A TO 0A VIN = 12V VOUT = 1.2V MODE = 0V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G03 VOUT (AC) 50mV/DIV IL 10A/DIV ILOAD 10A/DIV 50μs/DIV LOAD STEP 1A TO 11A TO 1A VIN = 12V VOUT = 1.2V MODE = INTVCC SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G04 Efficiency vs Load Current RUN 5V/DIV VOUT 0.5V/DIV TRACK/SS 0.5V/DIV 20ms/DIV VIN = 12V VOUT = 1.2V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G05 IL 5A/DIV VOUT 0.5V/DIV TRACK/SS 0.5V/DIV 20ms/DIV VIN = 12V VOUT = 1.2V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G06 Start-Up After Input Undervoltage VIN Cycled Low to High VIN 10V/DIV VOUT 1V/DIV TRACK/SS 5V/DIV 100ms/DIV VIN = 12V VOUT = 1.2V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G07 5ms/DIV VIN = 12V VOUT = 1.2V SW FREQ = 400kHz FIGURE 10 CIRCUIT 3879 G08 VMASTER 0.5V/DIV VOUT 0.5V/DIV LOAD CURRENT (A) 30 90 100 20 10 80 50 70 60 40 0.01 1 10 100 3879 G09 0 0.1 CONTINUOUS MODE DISCONTINUOUS MODE VIN = 12V VOUT = 1.2V SW FREQ = 400kHz FIGURE 10 CIRCUIT |
Similar Part No. - LTC3879_15 |
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Similar Description - LTC3879_15 |
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