DC/DC Controller, High Performance, 4V to 60V, 1 Output, Synchronous Buck, 900kHz, QFN-20

LTC3891EUDC#PBF - DC/DC Controller, High Performance, 4V to 60V, 1 Output, Synchronous Buck, 900kHz, QFN-20

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Product Overview

The LTC3891EUDC#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


Automotive, Power Management

Product Information

1 Output
Synchronous Buck (Step Down)
MSL 1 - Unlimited
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