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LTC3854EDDBTRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3854EDDBTRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page LTC3854 3854fa Typical applicaTion FeaTures applicaTions DescripTion Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller The LTC3854® is a high performance synchronous step- down switching DC/DC controller that drives an all N- channel synchronous power MOSFET stage. TheLTC3854featuresa400kHzconstantfrequencycurrent mode architecture. The LTC3854 operates from a 4.5V to 38V (40V absolute maximum) input voltage range and regulates the output voltage from 0.8V to 5.5V. The RUN/SS pin provides both soft-start and enable features. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output ca- pacitanceandESRvalues.CurrentfoldbacklimitsMOSFET dissipationduringshortcircuitconditions.Currentfoldback functions are disabled during soft-start. The LTC3854 has a minimum on-time at 75ns, making it well suited for high step-down ratios. The strong onboard MOSFET drivers allow the use of high power external MOSFETs to produce output currents up to 20A. High Efficiency Synchronous Step-Down Converter n Wide Operating VIN Range: 4.5V to 38V n RSENSE or DCR Current Sensing n ±1% 0.8V Reference Accuracy Over Temperature n 400kHz Switching Frequency n Dual N-channel MOSFET Synchronous Drive n Very Low Dropout Operation: 97% Duty Cycle n Starts Up Into Pre-Biased Output n Adjustable Output Voltage Soft-Start n Output Current Foldback Limiting (Disabled During Soft-Start) n Output Overvoltage Protection n 5V LDO for External Gate Drive n OPTI-LOOP® Compensation Minimizes COUT n Low Shutdown IQ: 15µA n Tiny Thermally Enhanced 12-Pin 2mm × 3mm DFN and MSOP Packages n Automotive Systems n Telecom Systems n Industrial Equipment n Distributed DC Power Systems 3854 TA01 LTC3854 0.1µF 0.1µF 47µF 50V 4.7µF 100pF 2200pF 4.7µH AT 8.2mΩ DCR 150µF VOUT 5V 7A VIN 6V TO 38V 42.2k 8.06k 10k VIN TG BOOST SW INTVCC BG GND RUN/SS ITH FB SENSE– SENSE+ 0.22µF 5.49k 4.99k + Efficiency and Power Loss vs Load Current LOAD CURRENT (A) 1 97 95 94 96 93 92 2.0 1.6 0.8 1.2 0.4 0 3 4 5 6 3854 TA01b EFFICIENCY VIN = 12V POWER LOSS 7 2 L , LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5705919, 6498466, 5408150, 6222231. |
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