LT1939IDD#TRPBF

Overview

The LT1939IDD#TRPBF is a monolithic power management IC from Analog Devices, integrating a 2A step-down switching regulator with an adjustable linear regulator and controller. It operates within an input voltage range of 3V to 25V, providing a buck output current of 2A and a linear output current of 400mA. The device features a wide switching frequency range from 250kHz to 2.2MHz and supports output voltages from 800mV to 24.25V for the buck converter. It is housed in a compact DFN-12 package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-current 2A synchronous buck converter alongside a dedicated linear regulator and controller on a single die.
• Offers flexible configuration through an adjustable switching frequency range spanning from 250kHz to 2.2MHz.
• Supports a broad input voltage window from 3V to 25V, accommodating various system power rails.

Applications

• Portable equipment requiring efficient multi-rail power distribution
• Battery-powered systems needing combined switching and linear regulation
• Embedded industrial control modules

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing. Confirm the IDD variant meets the required thermal performance for your enclosure. Ensure compatibility with the intended switching frequency settings. Check for RoHS compliance documentation. Validate that the DFN-12 footprint matches your PCB layout constraints before finalizing procurement.

Selection Notes

Select this component when space is limited but both high-current switching and precise linear regulation are necessary. It is suitable for designs where input voltages vary between 3V and 25V. Consider the thermal characteristics of the DFN-12 package for heat dissipation requirements. Evaluate the need for the integrated controller functionality versus using discrete components.

Part Context

This part belongs to the LT1939 series, which combines switching and linear technologies. It serves as a solution for applications demanding high efficiency and low noise. The integration reduces the bill of materials compared to separate regulators. It is designed for modern portable and industrial electronics.

Replacement Considerations

LT1939EDD#PBF is a documented pin-compatible alternative in tube packaging. Verify electrical specifications match exactly. Confirm package dimensions are identical for direct replacement. Check manufacturer datasheets for any functional differences between variants.