LT3645HMSE#PBF

Overview

The LT3645HMSE#PBF is a dual-output power management IC from Analog Devices, combining a synchronous step-down switching regulator with a low-dropout linear regulator. It operates within an input voltage range of 3.6V to 36V and features a fixed switching frequency of 750kHz. The buck converter provides an adjustable output voltage between 0.8V and 16V with a maximum current capacity of 500mA. The integrated LDO delivers an adjustable output from 0.8V to 8V at up to 200mA. Housed in a compact 16-WFQFN (3x3) package, the device supports surface-mount installation and functions reliably across an extended temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-efficiency synchronous buck converter and a precision LDO into a single compact package for space-constrained designs.
• Supports wide input voltage ranges up to 36V, enabling direct regulation from higher voltage bus lines without intermediate stages.
• Features independent output control allowing simultaneous generation of distinct voltage rails with separate current capabilities.

Applications

• Portable electronic devices requiring multiple regulated voltage rails from a single battery source
• Industrial control systems utilizing wide input voltage buses
• Embedded computing platforms needing efficient step-down conversion alongside low-noise analog supply regulation

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm RoHS compliance status and check for recent Product Change Notifications regarding manufacturing site updates. Ensure storage conditions meet moisture sensitivity level requirements prior to soldering. Validate that the specific suffix matches the required package variant for your PCB layout.

Selection Notes

Select this component when design constraints require minimizing board space by integrating both switching and linear regulation. It is suitable for applications where input voltages vary significantly but stable, low-noise outputs are necessary for sensitive analog circuits. Consider thermal performance under maximum load conditions given the small footprint.

Part Context

This part belongs to the LT3645 series of mixed-signal power management solutions. It represents a specialized integration strategy combining different regulation topologies to simplify system architecture. The series targets applications demanding high efficiency and precise voltage regulation within minimal physical dimensions.

Replacement Considerations

LT3645EUD#PBF