LT3685IMSE#TRPBF

Overview

The LT3685IMSE#TRPBF is a monolithic step-down switching regulator manufactured by Analog Devices Inc., designed for high-voltage input applications. It operates with an input voltage range from 3.6V to 36V and delivers a continuous output current of 2A. The device features a programmable switching frequency ranging from 200kHz to 2.4MHz, allowing optimization for efficiency or external component size. Output voltage is adjustable from 0.79V to 20V using a single external resistor divider. Packaged in a thermally enhanced 10-MSOP (EP) surface-mount package, it supports operation over an extended temperature range of -40°C to 125°C junction temperature.

Feature Summary

• Integrated high-voltage power switch capable of handling up to 36V input
• Programmable switching frequency for flexible design trade-offs
• Thermally enhanced MSOP package for improved heat dissipation
• Adjustable output voltage via single external feedback resistor

Applications

• Industrial control systems requiring isolated or non-isolated DC-DC conversion
• Battery-powered equipment with wide input voltage ranges
• Embedded systems needing efficient step-down regulation from higher bus voltages
• Automotive electronics operating within specified thermal and voltage limits

Procurement Notes

Verify the suffix #TRPBF confirms tape-and-reel packaging and lead-free status. Confirm the IMSE variant corresponds to the 10-MSOP EP package. Cross-reference the manufacturer datasheet for LT3685 to ensure compatibility with specific thermal and electrical requirements before integration.

Selection Notes

Select this component when input voltages exceed typical 5V or 12V rails but remain below 36V. The 2A output current suits moderate load applications. Choose based on required switching frequency to balance EMI performance against passive component size. Ensure PCB layout supports the exposed pad thermal path for reliable operation at maximum load.

Part Context

The LT3685 belongs to Analog Devices' family of high-voltage buck regulators. It shares architectural similarities with parts like the LT3680 and LT3689 but differs in output current capability and package options. This specific model targets designs requiring robust high-voltage tolerance in a compact footprint compared to discrete solutions.

Replacement Considerations

Direct substitutes include other Analog Devices high-voltage buck regulators such as the LT3680 series for higher current needs or the LT3689 for lower current applications. Verify pinout compatibility and thermal performance when replacing with equivalent parts from other manufacturers.