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

LTC3891EFE#PBF - DC/DC Controller, High Performance, 4V to 60V, 1 Output, Synchronous Buck, 900kHz, TSSOP-20

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Product Overview

The LTC3891EFE#PBF is a high performance synchronous step-down DC/DC Controller drives an all N-channel synchronous power MOSFET stage. A 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 TRACK/SS pin ramps the output voltages during start-up. Current fold back 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.
  • Low operating IQ (50µA)
  • Wide output voltage range (0.8V <= VOUT <= 24V)
  • RSENSE or DCR current sensing
  • 75 to 750kHz Phase-lockable frequency
  • 50 to 900kHz Programmable fixed frequency
  • Selectable continuous, pulse-skipping or low ripple Burst Mode® operation at light load
  • Selectable current limit
  • Very low dropout operation (99% duty cycle)
  • Adjustable output voltage soft-start or tracking
  • Power good output voltage monitor
  • Output overvoltage protection
  • Low shutdown IQ (<14µA)
  • Internal LDO powers gate drive from VIN or EXTVCC
  • No current fold back during start-up


Automotive, Power Management

Product Information

1 Output
Synchronous Buck (Step Down)
MSL 1 - Unlimited
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2115935 - Buck Controller, 60V-4V supply, 900 kHz, TSSOP-20

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