LTC3859IUHF#PBF

DC DC Switching Controllers Overview

The LTC3859IUHF#PBF is a high-performance triple output synchronous DC/DC switching regulator controller designed to drive all N-channel power MOSFET stages. It features a constant frequency current mode architecture with a phase-lockable switching frequency range of 75 kHz to 850 kHz. The device operates from a wide input supply voltage range of 4.5 V to 38 V, extending down to 2.5 V when biased from an auxiliary source. It provides three independent outputs with adjustable voltages between 800 mV and 24 V. Key electrical specifications include a typical quiescent current of 55 µA and a maximum operating temperature of +125 °C.

DC DC Switching Controllers Feature Summary

• Supports triple output configurations utilizing buck, buck, and boost topologies within a single controller package.
• Integrates a constant frequency current mode architecture that allows for external synchronization via a phase-lockable clock input.
• Features independent TRACK/SS pins for each channel to enable precise output voltage tracking and controlled soft-start sequencing.
• Includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout.

DC DC Switching Controllers Applications

• Industrial systems requiring multiple regulated voltage rails from a single power source
• Automotive always-on electronics and distributed DC power architectures
• Battery-operated digital devices needing extended run time through low quiescent current operation

DC DC Switching Controllers Procurement Notes

Verify the specific suffix and tape/reel or tube packaging requirements against the official Analog Devices datasheet before ordering. Confirm that the QFN-38 package footprint matches the target PCB design. Ensure the selected variant meets the required industrial temperature grade and RoHS compliance standards for the intended deployment environment.

DC DC Switching Controllers Selection Notes

Select this component when a design requires three distinct regulated outputs derived from a single controller IC to minimize board space. It is suitable for applications where input voltages vary significantly between 4.5 V and 38 V. Consider the thermal performance of the QFN-38 package and ensure adequate heatsinking if operating near the maximum current limits at elevated ambient temperatures.

DC DC Switching Controllers Part Context

This part belongs to the LTC3859 family of triple-output synchronous controllers manufactured by Analog Devices. It is functionally similar to other members like the LTC3859AIUHF but may differ in specific electrical characteristics or temperature ranges. The IUHF designation indicates an industrial temperature grade version housed in a 38-lead QFN package.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include other variants within the LTC3859 family, such as the LTC3859EUHF#TRPBF or LTC3859IFE#TRPBF, provided the package type and temperature grade align with the system requirements. Verify pin compatibility and electrical parameters before swapping.