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LTC3853 数据表(PDF) 32 Page - Linear Technology |
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LTC3853 数据表(HTML) 32 Page - Linear Technology |
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32 / 36 page  LTC3853 32 3853fc For more information www.linear.com/LTC3853 TYPICAL APPLICATIONS Triple 3.3V/2.5V/12V, 5A Step-Down Converter with RSENSE Synchronized at 400kHz TG1 TG2 BOOST1,2,3 SW1 SW2 BG1 BG2 SENSE1+ MODE/PLLIN SENSE2+ SENSE1– SENSE2– VFB1 VFB2 ITH1,2,3 VIN INTVCC DRVCC12 LTC3853 20k 1% FREQ/PLLFLTR ILIM PGND PGOOD12 SGND TK/SS1,2,3 VFB3 SENSE3– SENSE3+ SW3 TG3 BG3 RUN1,2,3 PGOOD3 10* 10* 20k 1% 10k 43.2k 1% 4.7µF VOUT1 3.3V 5A VOUT2 2.5V 5A 10k 1% 0.008 5% VOUT3 12V 4A VIN 13V TO 24V CITH1,2,3 RITH1,2,3 1000pF* PLLIN 400kHz 220µF 4V M1, M2, M3: Si4816BDY CHANNEL 1: RITH1 = 18k, CITH1 = 1500pF, CP1 = 220pF CHANNEL 2: RITH2 = 18k, CITH2 = 1500pF, CP2 = 220pF CHANNEL 3: RITH3 = 43k, CITH3 = 470pF, CP3 = 330pF CP1,2,3 33µF 35V CSS1,2,3 0.1µF 1000pF 1000pF* 10nF 1000pF* 10* 10pF 10* 2.2µH 3.3µH 6.8µH 22pF CB1,2,3 0.1µF SW1,2,3 DB1,2,3 M2 M1 M3 + 220µF 4V + 220µF 16V 3853 TA02 + 140k 1% 10* 10* 63.4k 1% 0.008 5% 10pF 0.011 5% *THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC EXTVCC Triple 1.8V/1.2V/2.5V, 15A High Current Step-Down Converter with RSENSE, fSW = 400kHz TG1 TG2 BOOST1,2,3 SW1 SW2 BG1 BG2 SENSE1+ SENSE2+ SENSE1– SENSE2– VFB1 VFB2 ITH1,2,3 VIN INTVCC DRVCC12 LTC3853 MODE/PLLIN 20k 1% FREQ/PLLFLTR ILIM PGND PGOOD12 SGND EXTVCC TK/SS1,2,3 VFB3 SENSE3– SENSE3+ SW3 TG3 BG3 RUN1,2,3 PGOOD3 100* 100* 20k 1% 2.55k 10k 1% 4.7µF 10k INTVCC VOUT1 1.8V 15A VOUT2 1.2V 15A 20k 1% 0.002 5% VOUT3 2.5V 15A VIN 6.5V TO 14V CITH1,2,3 RITH1,2,3 1000pF* 660µF 2.5V M1, M3, M5: RJK0305DPB M2, M4, M6: RJK0301DPB CHANNEL 1: RITH1 = 15k, CITH1 = 1500pF, CP1 = 330pF CHANNEL 2: RITH2 = 10k, CITH2 = 1500pF, CP2 = 220pF CHANNEL 3: RITH3 = 13k, CITH3 = 1500pF, CP3 = 330pF CP1,2,3 180µF 16V CSS1,2,3 0.1µF 1000pF 1000pF* 1000pF* 100* 100* 0.47µH 0.56µH 0.78µH CB1,2,3 0.1µF SW1,2,3 DB1,2,3 M3 M4 M1 M2 M5 M6 100* + 660µF 2.5V 47pF + 660µF 4V 3853 TA03 + 43.2k 1% 100* 24.9k 1% 0.002 5% 22pF 0.002 5% *THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC |
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