LT3689IMSE-5#TRPBF

Overview

The LT3689IMSE-5#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.4 V to 38 V and provides a fixed 5 V output at up to 700 mA. The device integrates a power-on reset generator and a watchdog timer for system protection. It features adjustable switching frequencies from 200 kHz to 2 MHz, low quiescent current of 50 µA, and thermal shutdown protection. Packaged in a 16-lead MSOP with exposed pad, it supports operation temperatures from -40°C to +125°C.

Feature Summary

• Integrated power-on reset generator and watchdog timer for enhanced system reliability
• Synchronous buck topology with high efficiency across wide input voltage ranges
• Adjustable switching frequency allows optimization for size and performance
• Thermal shutdown protection ensures safe operation under overload conditions

Applications

• Industrial control systems requiring robust power management
• Automotive electronics operating within specified voltage limits
• Communication infrastructure equipment needing reliable reset functions
• Portable devices utilizing battery sources with wide voltage variation

Procurement Notes

Verify the exact part number suffix #TRPBF indicates tape and reel packaging when ordering. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure supply chain authenticity by sourcing only from authorized distributors. Check for any recent product change notices that may affect pinout or electrical characteristics before finalizing design integration.

Selection Notes

Select this component when a fixed 5 V output is required alongside integrated reset and watchdog functionalities. Consider the 700 mA output current capability against load requirements. Evaluate the need for external compensation components based on desired switching frequency. Verify input voltage stability remains within the 3.4 V to 38 V operational window for optimal regulation performance.

Part Context

This part belongs to the LT3689 family of micropower synchronous buck regulators. It shares architectural similarities with other members but offers specific fixed output voltage options. The MSOP-16 package provides a compact solution for space-constrained designs. Integration of safety features distinguishes it from standard buck regulators lacking built-in monitoring circuits.

Replacement Considerations

LT3689IMSE-5#PBF is a tube-packaged equivalent with identical electrical specifications. Cross-reference with LT3689 variants offering different fixed output voltages if system requirements change. Ensure compatible footprint and pinout compatibility when substituting with similar synchronous buck regulators from other manufacturers.