LT3991EMSE#PBF

Overview

The LT3991EMSE#PBF is a monolithic step-down DC/DC switching regulator manufactured by Analog Devices Inc. It features an input voltage range of 4.5V to 55V and delivers up to 1.2A output current. The device operates with a quiescent current of 2.8µA and supports adjustable switching frequencies up to 2MHz. It utilizes an MSOP-10 package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Monolithic buck converter topology for high efficiency
• Ultra-low quiescent current for battery-powered applications
• Adjustable switching frequency up to 2MHz
• Wide input voltage range supporting 4.5V to 55V

Applications

• Industrial control systems
• Automotive electronics
• Distributed power architectures
• Battery-operated equipment

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when ordering. Confirm package type MSOP-10 matches PCB footprint requirements. Ensure input voltage does not exceed 55V maximum rating. Check operating temperature range against environmental conditions. Validate switching frequency settings against EMI constraints.

Selection Notes

Select this component for designs requiring wide input voltage tolerance and low standby power consumption. The adjustable frequency allows optimization for size or noise performance. Consider thermal management due to high current capability in a small package. Verify compatibility with external compensation components for stability.

Part Context

Part of the LT3991 family of high voltage step-down regulators. Designed for applications needing robust performance across varying input conditions. Commonly used where space is limited but high efficiency is critical. Often paired with demonstration boards like DC1526A for evaluation.

Replacement Considerations

LT3991EMSE-5#PBF is a documented variant within the same series. Verify pinout and electrical specifications match before substitution. Ensure thermal characteristics are compatible with existing design.