LTC3891MPFE#PBF Datasheet PDF - Linear Technology

●The LTC3891MPFE#PBF is a high-performance step-down Switching Regulator DC/DC Controller that drives an all N-channel synchronous power MOSFET stage. The constant frequency current-mode architecture allows a phase-lockable frequency of up to 750kHz. The 50µA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3891 features a precision 0.8V reference and power good output indicator. A wide 4 to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC3891 can be programmed between 0.8 to 24V. The TRACK/SS pin ramps the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads.

● RSENSE or DCR current sensing

● Selectable continuous, pulse-skipping or low ripple burst mode operation at light load

● Selectable current limit

● Adjustable output voltage soft-start or tracking

● Power good output voltage monitor

● Output overvoltage protection

● <14µA Low shutdown

● Internal LDO powers gate drive from VIN or EXTVCC

● No current foldback during start-up