LTC3858EUFD-1#PBF

DC DC Switching Controllers Overview

The LTC3858EUFD-1#PBF is a low quiescent current, dual output synchronous buck controller from Analog Devices Inc. It operates with an input voltage range of 4V to 38V and supports switching frequencies between 105kHz and 835kHz for one channel, and 350kHz to 535kHz for the other. The device features a maximum duty cycle of 0.994 and delivers positive outputs via a transistor driver configuration. It utilizes a 28-WFQFN package with exposed pad, rated for junction temperatures from -40°C to 125°C. Key electrical parameters include a typical no-load quiescent current of 8µA and a supply voltage range of 4V to 38V.

DC DC Switching Controllers Feature Summary

• Dual independent synchronous buck channels with low quiescent current operation
• Phase-shifted operation capability to minimize input capacitor ESR losses
• Integrated soft-start and tracking functionality for controlled power-up sequences

DC DC Switching Controllers Applications

• Battery-operated digital devices requiring extended run time
• Distributed DC power systems in industrial environments
• Automotive always-on systems with wide input voltage ranges

DC DC Switching Controllers Procurement Notes

Verify the specific suffix EUFD against official Analog Devices documentation to confirm pinout and thermal pad specifications. Ensure the component matches the required 28-WFQFN package dimensions and exposed pad thermal requirements for your PCB layout. Cross-reference the datasheet revision date to confirm compatibility with your design constraints.

DC DC Switching Controllers Selection Notes

Select this controller when dual isolated or non-isolated outputs are required from a single input source. Consider the phase-shift capability for noise reduction in sensitive applications. Evaluate the thermal performance of the WFQFN package against your system's heat dissipation needs. Verify that the external MOSFET selection aligns with the gate drive capabilities and switching frequency settings.

DC DC Switching Controllers Part Context

This component belongs to the LTC3858 family of synchronous step-down controllers designed for high efficiency and low standby power consumption. It complements other Analog Devices PMIC solutions by providing flexible multi-output regulation. The device integrates precision references and compensation networks to simplify design while maintaining robust transient response across varying load conditions.

DC DC Switching Controllers Replacement Considerations

LTC3858EGN-1#PBF (SSOP package variant)

DC DC Switching Controllers FAQ

What is the maximum duty cycle supported by the LTC3858EUFD-1?

The device supports a maximum duty cycle of 0.994, allowing for efficient conversion at low output voltages relative to the input.

How does the LTC3858EUFD-1 handle input capacitor losses?

It minimizes power loss and noise due to input capacitor ESR by operating the two controller output stages out-of-phase.