LT3991IMSE#PBF

Overview

The LT3991IMSE#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4 V to 55 V and provides a fixed 5 V output at up to 1.2 A. The device features a 2 MHz switching frequency and ultra-low quiescent current of 2.8 uA, dropping to 1.7 uA in shutdown mode. Packaged in a 10-lead MSOP, it supports operation from -40°C to +125°C.

Feature Summary

• Synchronous buck topology for high efficiency
• Ultra-low static current consumption
• Integrated 2 MHz fixed switching frequency
• Shutdown control capability

Applications

• Battery-powered portable electronics
• Industrial control systems
• Automotive infotainment modules

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance against the manufacturer's latest datasheet. Confirm package dimensions match the MSOP-10 specification. Check for obsolescence notices or lifecycle status changes directly from Analog Devices before finalizing procurement plans.

Selection Notes

Select this component when a fixed 5 V output is required from a wide input range. The low quiescent current makes it suitable for battery-operated devices requiring extended standby life. Ensure the thermal design accommodates the MSOP-10 package constraints for the expected load conditions.

Part Context

This part belongs to the LT3991 series of micropower synchronous step-down regulators. It is designed for applications demanding high efficiency across a wide input voltage range while maintaining minimal power consumption during idle states. The series targets space-constrained designs requiring reliable DC-DC conversion.

Replacement Considerations

Consult official substitution guides for pin-compatible alternatives within the Analog Devices portfolio. Verify that any replacement maintains the 5 V fixed output and similar quiescent current specifications.