LTC3728LEGN#TRPBF

DC DC Switching Controllers Overview

The LTC3728LEGN#TRPBF is a dual high-performance synchronous step-down switching regulator controller from Analog Devices. It drives all N-channel power MOSFET stages for two independent output channels. The device supports input voltages from 3.5V to 36V and delivers up to 25A total output current with configurable outputs of 3.3V or 5V. Operating at a fixed 550kHz frequency, it features a constant frequency current mode architecture. The component operates within a temperature range of -40°C to +85°C and is housed in a 28-lead SSOP package.

DC DC Switching Controllers Feature Summary

• Dual channel architecture driving all N-channel synchronous power MOSFET stages
• Constant frequency current mode control architecture
• Integrated soft start, enable, and power good functions

DC DC Switching Controllers Applications

• Point-of-load regulation for industrial systems
• Telecommunications infrastructure power distribution
• Embedded computing board voltage regulation

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging configuration. Confirm the SSOP-28 package variant matches the design footprint requirements. Ensure the 3.5V to 36V input range aligns with the system supply rails. Validate that the 550kHz switching frequency does not conflict with electromagnetic interference constraints in the target application environment.

DC DC Switching Controllers Selection Notes

Select this controller when dual isolated or non-isolated buck conversions are required from a single wide-range input source. The fixed 550kHz frequency simplifies filter design compared to adjustable variants. The SSOP package offers a compact solution for space-constrained boards where thermal performance can be managed through PCB layout rather than large heatsinks inherent in QFN packages.

DC DC Switching Controllers Part Context

This component belongs to the LTC3728L family of dual synchronous step-down controllers. It shares the core control logic with other variants like the EUH and LCGN but differs in package type and specific electrical tolerances. The LEGN designation specifically identifies the SSOP-28 plastic package version, distinguishing it from the leadless QFN options available in the same product line.

DC DC Switching Controllers Replacement Considerations

Direct pin-compatible replacements include other LTC3728L variants such as LTC3728EUH#TRPBF or LTC3728LCGN#TRPBF, provided the package change is acceptable. Verify that the replacement part maintains the 550kHz fixed frequency and compatible drive capabilities for the existing MOSFET selection.