LT3971AIMSE#TRPBF

Overview

The LT3971AIMSE#TRPBF is a monolithic buck switching regulator from Analog Devices, housed in a 10-lead MSOP package with an exposed pad. It accepts input voltages from 4.3V to 38V and delivers up to 1.3A of output current. The device features a high-efficiency internal switch and operates at adjustable frequencies up to 2MHz. It maintains low quiescent current consumption of 2.2µA during regulation and reduces supply current to 700nA when disabled via the enable pin.

Feature Summary

• Ultra-low quiescent current design ensures minimal power consumption during no-load regulation.
• Burst Mode operation maintains high efficiency at light loads while keeping output ripple below 15mV.
• Internally compensated current mode topology provides fast transient response and loop stability.
• Integrated power good flag signals when the output voltage reaches 91% of its programmed level.

Applications

• Battery-powered portable equipment requiring extended runtime
• Industrial systems with wide input voltage ranges
• Embedded controllers needing efficient step-down conversion

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging for automated assembly. Confirm that the AIMSE designation corresponds to the industrial temperature range (-40°C to +125°C). Ensure compatibility with the required MSOP-10 footprint and thermal pad soldering requirements on the target PCB layout.

Selection Notes

Select this component when a wide input voltage range up to 38V is required alongside high efficiency at low currents. The adjustable frequency feature allows optimization for external component size versus noise performance. Consider the exposed pad for thermal management in high-current applications.

Part Context

This part belongs to the LT3971A family, which offers improved reference accuracy compared to earlier versions. It serves as a compact solution for space-constrained designs requiring robust power management in industrial or automotive environments.

Replacement Considerations

LT3971AIMSE-5#TRPBF: Fixed 5V output variant with specified USB pin current characteristics.

FAQ

How does the Burst Mode operation affect output ripple?

Burst Mode maintains high efficiency at low output currents while keeping the output ripple below 15mV in typical applications.

What is the shutdown current when the enable pin is deactivated?

An accurate 1V threshold enable pin shuts down the regulator, reducing the input supply current to 700nA.