LT3645IUD#PBF

Overview

The LT3645IUD#PBF is a dual-output power management IC featuring one synchronous buck converter and one low-dropout linear regulator. It operates from an input voltage range of 3.6V to 36V. The switching regulator provides up to 500mA at adjustable output voltages between 0.8V and 16V, while the LDO delivers 200mA with outputs ranging from 0.8V to 8V. Operating at a fixed frequency of 750kHz, it utilizes a 16-pin QFN (3x3mm) package with an exposed thermal pad for efficient heat dissipation.

Feature Summary

• Integrates a high-efficiency synchronous step-down converter with a precision low-dropout regulator in a single compact package
• Supports wide input voltage ranges suitable for battery-powered systems and industrial bus architectures
• Features independent control loops allowing flexible configuration for mixed-signal power requirements

Applications

• Portable electronic devices requiring multiple regulated voltage rails from a single source
• Industrial control systems utilizing standard voltage buses
• Embedded systems needing combined switching and linear regulation capabilities

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm temperature grade and packaging details. Ensure compatibility with target input voltage ranges and thermal management requirements. Cross-reference pin assignments with the latest datasheet revision to prevent integration errors during PCB layout and assembly processes.

Selection Notes

Select this component when space constraints necessitate combining switching and linear regulation. Evaluate thermal performance based on total power dissipation across both regulators. Confirm that the required output currents do not exceed the specified limits for either the buck or LDO channel under maximum operating temperatures.

Part Context

This device belongs to the LT3645 family of integrated power management solutions designed for applications requiring efficient power conversion alongside stable linear regulation. It addresses the need for compact designs by consolidating multiple power stages into a single surface-mount package, reducing overall bill of materials and board footprint compared to discrete solutions.

Replacement Considerations

LT3645EUD#PBF is a documented parameter-equivalent alternative within the same product family.