LTC3855IFE

DC DC Switching Controllers Overview

The LTC3855IFE is a dual-channel, multiphase synchronous buck DC/DC controller manufactured by Analog Devices. It operates with an input voltage range of 4.5 V to 38 V and supports output voltages from 600 mV to 12.5 V. The device provides up to 30 A output current per channel and features a programmable switching frequency between 250 kHz and 770 kHz. Packaged in a 38-lead TSSOP with an exposed pad, it includes integrated drivers for N-channel MOSFETs, remote sensing capabilities, and thermal compensation.

DC DC Switching Controllers Feature Summary

• Integrates a high-speed differential remote sense amplifier to minimize load regulation errors caused by ground offsets.
• Supports DCR current sensing with built-in temperature compensation to maintain accurate current limits across operating temperatures.
• Enables multiphase operation with phase-shift control to reduce input capacitance requirements and power loss.

DC DC Switching Controllers Applications

• Computer systems requiring multi-phase power distribution
• Telecommunications infrastructure equipment
• Industrial and medical instrumentation power supplies

DC DC Switching Controllers Procurement Notes

Verify the specific suffix against official documentation to confirm package type and tape/reel configuration. Ensure compatibility with your PCB footprint for the TSSOP-EP-38 package. Confirm RoHS compliance status through the manufacturer's latest datasheet before finalizing procurement specifications.

DC DC Switching Controllers Selection Notes

Select this component when designing high-current buck converters requiring precise load regulation over long traces. The integrated remote sense amplifier addresses ground shift issues common in high-power applications. Consider the thermal performance of the exposed pad package for efficient heat dissipation in dense layouts.

DC DC Switching Controllers Part Context

This part belongs to the PolyPhase series of power management ICs designed for high-efficiency voltage regulation. It complements other controllers in the family by offering dual-channel capability within a compact surface-mount package suitable for modern electronic designs.

DC DC Switching Controllers Replacement Considerations

Check for direct pin-compatible alternatives such as the LTC3855IUJ#PBF if a QFN package is preferred. Verify that any substitute maintains the same input voltage range and current drive capabilities for seamless integration.

DC DC Switching Controllers FAQ

How does the LTC3855IFE handle inductor DC resistance (DCR) variations?

It includes a dedicated temperature compensation circuit that adjusts the peak current limit voltage to counteract the positive temperature coefficient of copper windings, ensuring stable current limiting.

What is the purpose of the differential remote sense pins?

They allow the controller to measure the output voltage directly at the load, eliminating errors caused by voltage drops across PCB traces and ground planes under heavy load conditions.