LTC7851IUHH-1

DC DC Switching Controllers Overview

The LTC7851IUHH-1 is a quad output multiphase synchronous step-down switching regulator controller from Analog Devices. It employs a constant frequency voltage mode architecture for high-performance power delivery. The device supports an input voltage range of 7V to 14V. It features a programmable switching frequency between 250kHz and 3MHz. The maximum duty cycle reaches 91.5%. The controller operates with a supply voltage (VCC/VDD) of 3V to 5.5V. It is housed in a 58-pin PQFN package.

DC DC Switching Controllers Feature Summary

• Quad output capability for independent or interleaved phase control
• Constant frequency voltage mode architecture for stable regulation
• Integrated protection features including current limiting, soft start, and power good signaling
• Supports tracking and frequency synchronization functions

DC DC Switching Controllers Applications

• High current server and storage backplane power distribution
• Telecommunications infrastructure power systems
• Industrial equipment requiring multi-rail voltage regulation
• Networking hardware with multiple low-voltage logic loads

DC DC Switching Controllers Procurement Notes

Verify the specific suffix and marking on the component to confirm it matches the -1 variant specifications. Ensure the ordering part number includes the correct package designation and temperature grade. Cross-reference the manufacturer's latest datasheet revision to confirm pinout compatibility and electrical characteristics before finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this controller when designing systems requiring four independent buck outputs from a single IC. It is suitable for applications needing high current density and precise voltage regulation. Consider the external MOSFET selection based on the required output current and thermal constraints. Evaluate the PCB layout requirements for the 58-pin QFN package to ensure optimal thermal performance and signal integrity.

DC DC Switching Controllers Part Context

This component belongs to the LTC7851 family of multiphase controllers. It is designed to drive external N-channel MOSFETs in a synchronous buck configuration. The device integrates gate drivers and error amplifiers for each channel. It is intended for use in compact power solutions where board space is limited but high efficiency is required.

DC DC Switching Controllers Replacement Considerations

Check for direct pin-compatible alternatives within the same product family. Verify that any substitute controller supports the same number of outputs and similar switching frequency ranges. Ensure the replacement device meets the same input voltage and thermal operating conditions.