LT1939EDD

Overview

The LT1939EDD is a monolithic step-down regulator and linear regulator/controller featuring two outputs. It operates with an input voltage range of 3 V to 25 V and provides a maximum output current of 2 A. The adjustable output voltage spans from 800 mV to 24.25 V. The device supports a switching frequency between 250 kHz and 2.2 MHz and maintains a static current of 2.5 mA. It functions within a temperature range of -40°C to +125°C and utilizes a DFN-12 surface-mount package.

Feature Summary

• Integrates a buck switching regulator with a linear regulator or controller in a single monolithic package
• Supports dual independent outputs for combined power management requirements
• Features adjustable switching frequency to optimize efficiency and component size

Applications

• Portable equipment requiring efficient multi-rail power distribution
• Industrial control systems utilizing wide input voltage ranges
• Embedded systems needing integrated switching and linear regulation

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm pinout, thermal characteristics, and environmental compliance. Confirm availability status through authorized distributors as supply levels fluctuate. Ensure the selected package variant matches the required PCB footprint and thermal dissipation needs for the target application environment.

Selection Notes

Select this component when a design requires both high-efficiency switching regulation and precise linear control within a compact form factor. Evaluate the thermal performance of the DFN-12 package against the expected load conditions. Consider the adjustable frequency range to balance electromagnetic interference constraints with passive component sizing requirements.

Part Context

This part belongs to the LT1939 series of mixed-signal power management ICs. It is designed to replace discrete solutions by combining buck conversion capabilities with linear regulation functions. The series targets applications demanding high power density and simplified bill of materials in space-constrained electronic designs.

Replacement Considerations

Direct substitutes include the LT1938EDD#PBF, which offers similar buck regulation but with different current ratings and packaging. Verify compatibility regarding input voltage limits and thermal performance before substitution.