LTC3859AEUHF#TRPBF

DC DC Switching Controllers Overview

The LTC3859AEUHF#TRPBF is a high-performance triple-output synchronous DC/DC switching regulator controller manufactured by Analog Devices Inc. It supports Buck, Buck-Boost, and SEPIC topologies with an input voltage range of 2.5V to 38V. The device drives all N-channel power MOSFET stages using a constant frequency current mode architecture. It features a phase-lockable switching frequency up to 850kHz and operates from a supply voltage of 4.5V to 38V. The component is housed in a 38-WFQFN (5x7) package with an exposed pad.

DC DC Switching Controllers Feature Summary

• Supports multiple output configurations including dual buck/buck-boost or buck/SEPIC combinations.
• Enables operation from low input voltages as low as 2.5V when biased from the boost output.
• Integrates control features such as soft start, tracking, enable, and power good signals.

DC DC Switching Controllers Applications

• High efficiency dual 12V/3.3V synchronous buck/boost converter designs
• Triple output systems requiring 24V, 1V, and 1.2V rails from a 12V input
• Applications combining step-down converters with SEPIC topology for variable inputs

DC DC Switching Controllers Procurement Notes

Verify that the suffix #TRPBF indicates tape and reel packaging with lead-free finish and RoHS compliance. Confirm the specific grade (A) matches thermal and electrical requirements. Ensure the 38-QFN package dimensions align with PCB layout constraints. Cross-reference the manufacturer part number directly with Analog Devices documentation to avoid counterfeit components.

DC DC Switching Controllers Selection Notes

Select this controller for designs requiring three independent regulated outputs from a single wide-range input source. It is suitable for applications needing flexible topologies like buck-boost or SEPIC alongside standard buck converters. Consider the 850kHz maximum switching frequency for balancing efficiency and component size. Ensure external N-channel MOSFETs are rated for the required current and voltage levels.

DC DC Switching Controllers Part Context

This component belongs to the LTC3859 family of triple-output synchronous controllers. It shares architectural similarities with the LTC3859EUHF but differs in temperature grade and specific performance characteristics defined by the 'A' suffix. The EUHF designation refers to the 38-pin QFN package type used across the series for compact surface-mount implementations.

DC DC Switching Controllers Replacement Considerations

The LTC3859EUHF is a related variant within the same product family offering similar triple-output capabilities. Verify if the specific temperature grade or electrical tolerances of the EUHF variant meet the design requirements before substitution.