LTC3891IUDC#TRPBF

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 <lt/> 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

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