LT3971IMSE-5#PBF

Overview

The LT3971IMSE-5#PBF is a monolithic buck switching regulator from Analog Devices, housed in a 10-lead MSOP package with an exposed thermal pad. It accepts an input voltage range of 4.3 V to 38 V and provides a fixed 5 V output at up to 1.2 A. The device operates with a quiescent current of 2.8 µA during regulation and 1.7 µA in shutdown mode. It supports adjustable switching frequencies up to 2 MHz and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Ultra-low quiescent current design maintains high efficiency at low load currents while keeping output ripple below 15mV via Burst Mode operation.
• Internally compensated current mode topology ensures fast transient response and stable loop performance across varying conditions.
• Integrated power good flag signals when the output voltage reaches 91% of the programmed level for system monitoring.

Applications

• Battery-powered portable equipment requiring extended standby life
• USB-powered systems utilizing specified output pin characteristics
• Industrial control modules operating in wide input voltage environments

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm the specific suffix matches the required fixed output voltage and package variant. Review the latest datasheet for any engineering change notices (ECNs) that may affect pin compatibility or electrical specifications before finalizing procurement orders.

Selection Notes

Select this part for applications demanding low static current and compact footprint. Ensure the input voltage remains within the 4.3 V to 38 V window. Consider thermal management requirements due to the MSOP package size. Validate that the fixed 5 V output aligns with downstream load requirements without needing external feedback resistors.

Part Context

This component belongs to the LT3971 family of step-down regulators designed for high-efficiency power conversion. It shares architectural similarities with the LT3971A series but features distinct reference accuracy and current specifications tailored for specific interface standards. The IMSE-5 designation indicates the industrial temperature grade and fixed 5 V output configuration.

Replacement Considerations

LT3971EMSE-5#PBF offers equivalent electrical performance with potential packaging material updates. LT3971A-5#PBF provides improved reference accuracy and specified USB-related current limits. Verify pinout compatibility and thermal resistance differences when substituting these variants in existing designs.