LTC3891MPFE#PBF

LINEAR TECHNOLOGY  LTC3891MPFE#PBF  降压控制器, 60V-4V电源, 900 kHz, TSSOP-20

The 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.

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RSENSE or DCR current sensing

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

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Selectable current limit

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Adjustable output voltage soft-start or tracking

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Power good output voltage monitor

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Output overvoltage protection

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<14µA Low shutdown

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Internal LDO powers gate drive from VIN or EXTVCC

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No current foldback during start-up