LT3685IDD#TRPBF

Overview

The LT3685IDD#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It features an integrated high-side N-channel power switch capable of delivering up to 2A of output current. The device operates with an input voltage range from 3.6V to 36V and supports adjustable output voltages starting from 0.79V up to 20V. It utilizes a fixed internal switching frequency of 2.4MHz, allowing for the use of small external components. The IC is housed in a thermally enhanced 10-lead DFN (3mm x 3mm) package with an exposed pad, designed for surface-mount installation.

Feature Summary

• Integrates a high-side N-channel power switch for compact design
• Supports wide input voltage range suitable for industrial and automotive sources
• Features programmable soft-start to limit inrush current during startup
• Includes cycle-by-cycle current limiting for output short-circuit protection

Applications

• Industrial point-of-load regulation
• Automotive battery-powered systems
• Unregulated wall transformer power supplies
• Distributed power architectures

Procurement Notes

Verify the specific suffix IDD against the official Analog Devices datasheet to confirm temperature grade and packaging configuration. Ensure the ordering part number matches the required tape and reel quantity specified in the manufacturer's documentation. Cross-reference the component marking code with the datasheet to authenticate the device origin and prevent counterfeit substitution.

Selection Notes

Select this component when a single-output buck converter is required with an input voltage up to 36V. The 2.4MHz fixed frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the thermal performance of the DFN package and ensure adequate PCB copper area for heat dissipation. Verify that the required output voltage falls within the 0.79V to 20V adjustable range.

Part Context

This part belongs to the LT3685 family of high-voltage step-down regulators. It shares architectural similarities with other Linear Technology buck converters but is distinguished by its specific 2.4MHz operating frequency and 2A current capability. The family targets applications requiring efficient power conversion from higher voltage rails to lower logic or sensor voltages.

Replacement Considerations

LT3685EDD#TRPBF: Pin-compatible alternative with different temperature rating.