LTC7851IUHH#TRPBF

DC DC Switching Controllers Overview

The LTC7851IUHH#TRPBF is a quad output multiphase synchronous step-down switching regulator controller from Analog Devices. It employs a constant frequency voltage mode architecture to manage multiple power rails efficiently. The device supports an input voltage range of 7V to 14V and operates with a switchable frequency between 250kHz and 3MHz. It features a 58-lead QFN package designed for high-density applications requiring precise multi-phase control.

DC DC Switching Controllers Feature Summary

• Quad output capability for independent or synchronized multi-phase regulation
• Constant frequency voltage mode architecture for stable transient response
• Integrated soft-start and tracking functions for controlled power sequencing
• Supports discrete gate drivers and MOSFETs or DrMOS configurations

DC DC Switching Controllers Applications

• High-current CPU and GPU core voltage regulation in servers
• Multi-rail power distribution networks for telecommunications equipment
• Industrial automation systems requiring precise voltage monitoring
• Automotive infotainment and control unit power supplies

DC DC Switching Controllers Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. Ensure the component matches the 58-pin PQFN footprint. Check for RoHS compliance documentation if required by your manufacturing standards. Validate that the part number corresponds to the standard commercial grade unless automotive qualification is explicitly stated.

DC DC Switching Controllers Selection Notes

Select this controller when designing systems requiring four independent buck outputs with phase shedding capabilities. It is suitable for applications needing flexible switching frequencies up to 3MHz to minimize passive component size. Consider its compatibility with external N-channel MOSFETs or integrated DrMOS devices for optimal thermal performance. Ensure the design accommodates the 7V to 14V input range typical of automotive and industrial bus architectures.

DC DC Switching Controllers Part Context

This component belongs to the LTC7851 family of multiphase controllers, designed for high-efficiency DC/DC conversion. It complements other Analog Devices PMIC solutions by offering scalable power delivery for complex digital loads. The series is characterized by its ability to drive multiple phases simultaneously while maintaining tight voltage regulation across varying load conditions.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include the LTC7851EUHH and LTC7851IUHH variants, which share identical functional specifications but may differ in temperature grades or packaging formats. Verify pinout compatibility and electrical parameters before substitution. Alternative controllers from other manufacturers require careful evaluation of switching frequency ranges and control loop stability.

DC DC Switching Controllers FAQ

What is the maximum switching frequency supported by the LTC7851?

The LTC7851 supports a switchable frequency range from 250kHz to 3MHz.

Does the LTC7851 support phase shedding?

Yes, the controller includes automatic phase shedding functionality to improve efficiency at light loads.

What type of gate drivers does the LTC7851 utilize?

It utilizes internal high-side and low-side gate drivers capable of driving external N-channel MOSFETs or DrMOS devices.