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ANALOG DEVICES LTC3891EUDC#PBF

DC/DC Controller, Synchronous Buck, 4V to 60V Supply, 1 Output, 99% Duty Cycle, 835kHz, QFN-EP-20

ANALOG DEVICES LTC3891EUDC#PBF
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Manufacturer Part No:
LTC3891EUDC#PBF
Order Code:
4026577
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Technical Datasheet:
LTC3891EUDC#PBF   Datasheet
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Product Overview

LTC®3891 is a high performance step-down switching regulator DC/DC 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. 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 4V 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 0.8V to 24V. The TRACK/SS pin ramps the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. Applications include automotive always-on systems, battery powered digital devices, distributed DC power systems.
  • Wide VIN range from 4V to 60V (65V abs max)
  • Wide output voltage range from 0.8V <= VOUT <= 24V
  • RSENSE or DCR current sensing, phase-lockable frequency (75KHz to 750KHz)
  • Programmable fixed frequency (50KHz to 900KHz)
  • Selectable continuous, pulse-skipping or low ripple, Burst Mode® operation at light load
  • Selectable current limit, very low dropout operation of 99% duty cycle
  • Adjustable output voltage soft-start or tracking, power good output voltage monitor
  • Output overvoltage protection, low shutdown IQ of < 14µA, no current foldback during start-Up
  • Internal LDO powers gate drive from VIN or EXTVCC
  • 20-lead (3mm × 4mm) plastic QFN package, -40°C to 125°C temperature range

Product Information

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:
4V

:
60V

:
1 Output

:
99%

:
QFN-EP

:
20Pins

:
835kHz

:
Synchronous Buck (Step Down)

:
-40°C

:
125°C

:
-

:
-

:
MSL 1 - Unlimited

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Technical Documents (1)

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