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LTC3853 数据表(PDF) 36 Page - Linear Technology |
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LTC3853 数据表(HTML) 36 Page - Linear Technology |
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36 / 36 page  LTC3853 36 3853fc For more information www.linear.com/LTC3853 LINEAR TECHNOLOGY CORPORATION 2008 LT 0315 REV C • PRINTED IN USA LinearTechnology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC3853 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC3850/LTC3850-1/ LTC3850-2 Dual Output Synchronous Step-Down DC/DC Controller RSENSE or DCR Current Sensing Phase-Lockable Fixed 250kHz to 780kHz Frequency, 4V ≤ VIN ≤ 30V, 0.8V ≤ VOUT ≤ 5.25V LTC3861 Dual Output Synchronous Step-Down DC/DC Controller with Diff Amp, DCR Current Sense, PolyPhase® and Three-State Output Drive Operates with Power Blocks, DRMOS Devices or External MOSFETs 3V ≤ VIN ≤ 24V LTC3855 Dual Output Synchronous Step-Down DC/DC Controller with Diff Amp, PolyPhase and DCR Temperature Compensation Phase-Lockable Fixed Frequency 250kHz to 770kHz, 4.5V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 12V LTC3829 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diff Amp, PolyPhase and DCR Temperature Compensation Phase-Lockable Fixed 250kHz to 770kHz Frequency, 4.5V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 5V LTC3856 2-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diff Amp, PolyPhase and DCR Temperature Compensation Phase-Lockable Fixed Frequency 250kHz to 770kHz, 4.5V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 5V LTC3851A/ LTC3851A-1 Single Output Synchronous Step-Down DC/DC Controller RSENSE or DCR Current Sensing Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz, 4V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 5.25V, MSOP-16E 3mm × 3mm QFN-16, SSOP-16 TG1 TG2 BOOST1,2,3 SW1 SW2 BG1 BG2 SENSE1+ SENSE2+ SENSE1– SENSE2– VFB1 VFB2 VFB3 ITH1 ITH2 ITH3 VIN INTVCC DRVCC12 LTC3853 MODE/PLLIN 20k 1% FREQ/PLLFLTR ILIM PGND PGOOD12 SGND TK/SS1 SENSE3– SENSE3+ SW3 TG3 BG3 RUN1 RUN2 RUN3 PGOOD3 EXTVCC 100* 100* 2.55k 4.7µF 10k INTVCC VOUT1 2.5V 40A VOUT1 0.002 5% VOUT1 VIN 6.5V TO 14V CITH1 RITH1 1000pF* 660µF 4V ×3 RITH1 = 3.9k, CITH1 = 10nF, CP1 = 470pF • 3 SHORT TK/SS1, TK/SS2 AND TK/SS3 TOGETHER CP1 180µF 16V CSS1 0.33µF 1000pF 1000pF* 1000pF* 100* 100* 0.78µH 0.78µH 0.78µH CB1,2,3 0.1µF SW1,2,3 DB1,2,3 100* + 3853 TA05 100* 43.2k 1% 0.002 5% 47pF 0.002 5% *THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC TYPICAL APPLICATION Three Phase 2.5V Output High Current Step-Down Converter with RSENSE |
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