LTC3851AEMSE#PBF

LTC®3851A 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. This 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-skipping mode or continuous inductor current mode at light loads and allows the IC to be synchronized to an external clock. Typical applications are telecom systems, industrial equipment, distributed DC power systems.

• RSENSE or DCR current sensing, ±1% output voltage accuracy
• Dual N-channel MOSFET synchronous drive, very low dropout operation: 99% duty cycle
• Adjustable output voltage soft-start or tracking, output current foldback limiting
• Output overvoltage protection, 5V internal regulator, OPTI-LOOP® compensation minimizes COUT
• Selectable continuous, pulse-skipping or Burst Mode® operation at light loads
• Feedback current is –50nA maximum
• SENSE pins current is ±2µA
• Regulated feedback voltage range 0.792 to 0.808V (TH=1.2V, 0°C to 85°C, TA=25°C. VIN=15V, VRUN=5V)
• 16-lead plastic MSOP package
• Temperature rating range from –40°C to 125°C

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