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LTC3891EUDC The LTC3891EUDC is a high-performance synchronous step-down DC/DC controller from LT. It operates with a wide input voltage range of 4V to 60V and supports adjustable output voltages from 0.8V to 24V.
Mfr Part #:

LTC3891EUDC

Available from 1 distributors
Mfr Name: LT
LT
The LTC3891EUDC is a high-performance synchronous step-down DC/DC controller from LT. It operates with a wide input voltage range of 4V to 60V and supports adjustable output voltages from 0.8V to 24V.
✓ Total Stock: 574 pcs

LTC3891EUDC Available from 1 distributor

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✓ Non-Authorised
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Optech Co.,Limited ✓
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574 pcs
On Request
574 pcs On Request 1 On Request On Request 1836 On Request On Request
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LTC3891EUDC Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Duty Cycle
Input Voltage
Mounting Type
Output Voltage
Package / Case
Quiescent Current
Tape & Reel
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LTC3891EUDC Description

Short technical summary and product information.

The LTC3891EUDC is a high-performance step-down switching regulator DC/DC controller designed by LT. It drives an all N-channel synchronous power MOSFET stage and features a constant frequency current mode architecture with a phase-lockable frequency up to 750kHz. The controller boasts a low no-load quiescent current of 50µA, extending operating run time in battery-powered systems.

 

Key electrical specifications include a wide input supply range from 4V to 60V (65V absolute maximum) and an adjustable output voltage range of 0.8V to 24V. It supports RSENSE or DCR current sensing and offers selectable continuous, pulse-skipping, or low ripple Burst Mode operation at light loads. The device also features a precision 0.8V reference and a power good output indicator.

 

The LTC3891EUDC is available in a compact 3mm x 4mm QFN-20 package, suitable for surface mount applications. Its design incorporates features like OPTI-LOOP® compensation for optimized transient response and current foldback to limit MOSFET heat dissipation during short-circuit conditions. The TRACK/SS pin allows for controlled output voltage ramping during start-up.

 

This controller is well-suited for applications such as automotive always-on systems, battery-powered digital devices, and distributed DC power systems where efficient power conversion and low quiescent current are critical.

LTC3891EUDC Quick Information

Product Type: DC DC Switching Controller
Canonical Name: LTC3891 Synchronous Step-Down Controller
Subcategory: Step-Down (Buck) Regulators

LTC3891EUDC Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

LTC3891EUDC Features

  • Wide 4V to 60V input voltage range.
  • Low 50µA no-load quiescent current.
  • Adjustable output voltage from 0.8V to 24V.
  • Phase-lockable frequency up to 750kHz.
  • Compact 3mm x 4mm QFN-20 package.

LTC3891EUDC Applications

  • Suitable for automotive always-on systems.
  • Ideal for battery-powered digital devices.
  • Used in distributed DC power systems.
  • Enables efficient power conversion designs.

LTC3891EUDC FAQs

6 frequently asked questions generated from this part’s specifications.
What is the input voltage range of the LTC3891EUDC?

The input voltage range is 4V to 60V (65V absolute maximum).

What is the output voltage range?

The output voltage is adjustable from 0.8V to 24V.

What is the quiescent current?

The quiescent current is 50µA typical with no load.

What are the switching frequency options?

The switching frequency can be programmed from 50kHz to 900kHz or phase-locked from 75kHz to 750kHz.

What package does the LTC3891EUDC come in?

It is packaged in a 3x4 QFN-20 surface mount package.

What is the maximum duty cycle?

The duty cycle can be up to 99% for very low dropout operation.

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