LTC3854 Datasheet | Linear Technology

.. Features n n n n n n n n n n n n n n LTC3854 Small Footprint, Wide VIN Range Synchronous Step-Down Controller DESCRIPTION The LTC3854® is a high performance synchronous stepdown switching regulator controller that drives an all N-channel synchronous power MOSFET stage. The LTC3854 Features a 400k Hz constant frequency current 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 pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. Current foldback limits MOSFET dissipation during short circuit conditions. Current foldback 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. 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. Wide Operating VIN Range: 4.5V to 38V RSENSE or DCR Current Sensing ±1% 0.8V Reference Accuracy Over Temperature 400k Hz Switching Frequency Dual N-channel MOSFET Synchronous Drive Very Low Dropout Operation: 97% Duty Cycle Starts Up Into Pre-Biased Output Adjustable Output Voltage Soft-Start Output Current Foldback Limiting (Disabled During Soft-Start) Output Overvoltage Protection 5V LDO for External Gate Drive OPTI-LOOP® pensation Minimizes COUT Low Shutdown IQ: 15μA Tiny 12-Pin 2mm × 3mm Thermally Enhanced DFN and MSOP Packages APPLICATIONS n n n n Automotive Systems Tele Systems Industrial Equipment Distributed DC Power Systems TYPICAL APPLICATION High Efficiency Synchronous...