The LTC3851A-1 is a high performance synchronous step-down switching regulator controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3851A-1 features a precision 0.8V reference and a power good indicator. A wide 4V to 38V (40V absolute maximum) input supply range encompasses most battery configurations and intermediate bus voltages. The TK/SS pin ramps the output voltage during start-up and shutdown with coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode operation, pulse-skipping mode or continuous inductor current mode at light loads and allows the IC to be synchronized to an external clock. The LTC3851A-1 contains an improved PLL compared to the LTC3851-1. The LTC3851A-1 is identical to the LTC3851A except that the ILIM pin is replaced by PGOOD. Features LTC3851 Not Recommended For New Designs LTC3851-1 Not Recommended For New Designs LTC3851A Adjustable Current Limit LTC3851A-1 PGOOD Output Applications * Automotive Systems * Telecom Systems * Industrial Equipment * Distributed DC Power Systems * Wide VIN Range: 4V to 38V Operation * RSENSE or DCR Current Sensing * ±1% Output Voltage Accuracy * Power Good Output Voltage Monitor * Phase-Lockable Fixed Frequency: 250kHz to 750kHz * Dual N-Channel MOSFET Synchronous Drive * Very Low Dropout Operation: 99% Duty Cycle * Adjustable Output Voltage Soft-Start or Tracking https://elecena.pl/product/1203038/synchronous-step-down-switching-regulator-controller 2010-11-04 https://elecena.pl/product/1203038/synchronous-step-down-switching-regulator-controller 2017-10-09 https://elecena.pl/product/1203038/synchronous-step-down-switching-regulator-controller 2025-01-22