LT3990HMSE#PBF

Overview

The LT3990HMSE#PBF is a monolithic buck switching regulator from Analog Devices, housed in a 16-lead MSOP package with an exposed pad. It operates with an input voltage range of 4V to 62V and delivers up to 350mA of output current. The device features a fixed 5V output and supports adjustable switching frequencies up to 2.3MHz. Quiescent current consumption is specified at 2.5µA, dropping to 1.7µA during shutdown. It functions within a temperature range of -40°C to +125°C.

Feature Summary

• Supports wide input voltage ranges up to 62V for flexible power supply integration
• Provides low quiescent current operation to enhance efficiency in battery-powered systems
• Features adjustable switching frequency to optimize external component size and performance

Applications

• Industrial control systems requiring high-voltage step-down conversion
• Automotive electronics operating under varying line conditions
• Portable instrumentation powered by single-cell lithium batteries or multi-cell packs

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence before procurement. Confirm the MSOP-16 package availability matches your assembly requirements. Ensure the fixed 5V output variant aligns with your circuit design needs, as other output voltages exist within the LT3990 family. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a fixed 5V output is required alongside high input voltage tolerance. The 350mA current limit suits moderate load applications without external pass transistors. Consider the thermal performance of the MSOP package for your PCB layout. If adjustable output voltage is needed, choose the EMSE variant instead. Verify that the 2.3MHz maximum frequency meets EMI constraints for your specific application environment.

Part Context

This part belongs to the LT3990 series of high-voltage buck regulators designed for space-constrained applications. It integrates the switch and control logic into a compact surface-mount package. The series is engineered for efficiency across wide input ranges, making it suitable for replacing linear regulators in high-differential-voltage scenarios.

Replacement Considerations

LT3990EMSE#PBF offers adjustable output voltage with similar electrical characteristics. LT3990IMSE#PBF provides extended industrial temperature range options. Verify pin compatibility and thermal dissipation capabilities when substituting with these variants.