LT3971EDD-5#TRPBF

Overview

The LT3971EDD-5#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4.3 V to 38 V and provides a fixed output voltage of 5 V at up to 1.2 A. The device features a switch frequency adjustable from 200 kHz to 2 MHz, enabling optimization for efficiency or size. It exhibits low quiescent current of 2.8 µA and shutdown supply current of 1.7 µA. Packaged in a 10-lead DFN with exposed pad, it supports operation from -40°C to +125°C.

Feature Summary

• Synchronous buck topology with integrated high-side and low-side switches
• Adjustable switching frequency from 200 kHz to 2 MHz
• Low quiescent current of 2.8 µA for extended battery life
• Integrated soft-start and cycle-by-cycle current limit protection

Applications

• Point-of-load regulation in industrial equipment
• Power supplies for automotive infotainment systems
• Battery-powered portable devices requiring efficient conversion
• General-purpose DC-DC conversion in embedded systems

Procurement Notes

Verify the specific suffix #TRPBF confirms tape-and-reel packaging when ordering. Confirm that the 'EDD' designation corresponds to the DFN-10 package variant. Ensure compatibility with the required thermal pad soldering process for proper heat dissipation. Check for any recent Product Change Notifications regarding material or marking updates.

Selection Notes

Select this part when a fixed 5 V output is required from a wide input range up to 38 V. Choose the DFN package for superior thermal performance compared to MSOP variants. Consider the adjustable frequency feature if EMI constraints require operation outside the default range. Verify that the 1.2 A output current meets the maximum load requirements of the target application.

Part Context

This component belongs to the LT3971 family of high-voltage synchronous buck regulators. It shares architectural similarities with the LT3971A series but differs in specific electrical parameters such as quiescent current and output current capability. The DFN package variant offers better thermal handling than the MSOP version, making it suitable for higher power density applications within the same footprint constraints.

Replacement Considerations

LT3971EDD-5#PBF (Tube Packaging)

FAQ

What is the minimum input voltage required for stable operation?

The minimum input voltage is 4.3 V.

Does the device support external synchronization?

Yes, the SYNC pin allows external clock synchronization.