LT3689IMSE-5#PBF

Overview

The LT3689IMSE-5#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It provides a fixed 5V output with a maximum current capability of 700mA. The device accepts an input voltage range from 3.4V to 38V and operates at a fixed switching frequency of 2MHz. It features a low quiescent current of 50µA and includes integrated power-on reset and watchdog timer functions for system protection. The component is housed in a 16-lead MSOP package with an exposed pad and 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 ensures high efficiency across the load range
• Fixed 2MHz switching frequency allows for compact external component selection
• Low quiescent current consumption supports battery-powered applications

Applications

• Portable electronic devices requiring regulated power supplies
• Industrial control systems utilizing microprocessors
• Communication equipment needing stable voltage rails
• Battery-operated instruments with strict power constraints

Procurement Notes

Verify the specific suffix designation to confirm the fixed output voltage configuration, as variations exist within the family. Ensure compatibility with the required thermal management solutions for the MSOP-16 package under expected load conditions. Confirm RoHS compliance status through official manufacturer documentation prior to integration into final assemblies.

Selection Notes

Select this component when a fixed 5V output is required from a wide input voltage range up to 38V. The integrated reset and watchdog features make it suitable for applications demanding fault monitoring without additional discrete logic. Consider the 700mA output limit against peak load requirements to ensure adequate headroom.

Part Context

This part belongs to the LT3689 series of synchronous step-down regulators designed for space-constrained applications. It shares architectural similarities with other members of the family but is distinguished by its fixed 5V output and specific pinout configuration. The series targets portable and industrial markets requiring efficient power conversion.

Replacement Considerations

LT3689HMSE-5#PBF offers similar functionality with an extended operating temperature range up to 150°C.