LTC3851

FEATURES n Wide VIN Range: 4V to 38V Operation n RSENSE or DCR Current Sensing n ±1% Output Voltage Accuracy n Phase-Lockable Fixed Frequency: 250kHz to 750kHz n Dual N-Channel MOSFET Synchronous Drive n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Output Current Foldback Limiting n Output Overvoltage Protection n 5V Internal Regulator n OPTI-LOOP® Compensation Minimizes COUT n Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads n Low Shutdown IQ: 20μA n VOUT Range: 0.8V to 5.5V n Thermally Enhanced 16-Lead MSOP, 16-Lead Narrow SSOP or 3mm × 3mm QFN Package APPLICATIONS n Automotive Systems n Telecom Systems n Industrial Equipment n Distributed DC Power Systems LTC3851 Synchronous Step-Down Switching Regulator Controller DESCRIPTION The LTC®3851 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 LTC3851 features a precision 0.8V reference that is compatible with a wide 4V to 38V input supply range. The TK/SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode operation, pulse ...