The LTC3852 is a constant frequency, current mode step-down DC/DC controller which can be powered by an on-board charge pump. Input supplies as low as 2.7V, when doubled by the charge pump, provide 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs. The constant-frequency current mode architecture allows for a phase-lockable fixed frequency of up to 750kHz. The RUN pin provides a precision enable threshold while the TRACK/SS pin combines tracking and adjustable soft-start features. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start. A power good output pin indicates when the output is within ±10% of its designed set point. Applications * General Purpose 3.3V Systems * Lithium-Ion Powered Devices * Distributed DC Power Systems * Charge Pump Input Range: 2.7V to 5.5V * Controller Input Range: 4V to 38V * Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs * RSENSE or DCR Current Sensing * ±1.25% Output Voltage Accuracy Over Temperature * Phase-Lockable Fixed Frequency: 250kHz to 750kHz * Power Good Output Voltage Monitor * Adjustable Soft-Start Voltage Ramping * Current Foldback Disabled During Start-Up * No Reverse Current During Soft-Start * Selectable Constant Frequency, Pulse-Skipping, or Burst Mode Operation * Output Overvoltage Protection * Very Low Dropout Operation: 99% Duty Cycle * Available in a 24-Lead (3mm × 5mm) QFN Package https://elecena.pl/product/1202865/low-input-voltage-synchronous-step-down-dc-dc-controller 2010-11-03 https://elecena.pl/product/1202865/low-input-voltage-synchronous-step-down-dc-dc-controller 2017-10-12 https://elecena.pl/product/1202865/low-input-voltage-synchronous-step-down-dc-dc-controller 2025-01-20