LT3689EMSE-5#PBF

Overview

The LT3689EMSE-5#PBF 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 functions within a temperature range of -40°C to +125°C and utilizes a 16-lead MSOP package.

Feature Summary

• Integrates a programmable power-on reset circuit with selectable delay times
• Includes a watchdog timer that monitors microprocessor activity and triggers a reset if the clock signal stops
• Features a high-efficiency synchronous buck topology with an internal 700 mA switch

Applications

• Portable equipment requiring robust power management and system monitoring
• Industrial control systems needing reliable reset generation
• Battery-powered devices utilizing wide input voltage ranges

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the MSOP-16 package dimensions match your PCB footprint requirements. Ensure the fixed 5 V output aligns with your load specifications, as adjustable variants exist within the same series.

Selection Notes

Select this component when a fixed 5 V rail is required alongside integrated system supervision features. The wide input voltage range suits applications powered by single-cell lithium batteries or higher voltage sources. Consider the 2 MHz switching frequency for balancing component size against electromagnetic interference performance.

Part Context

This part belongs to the LT3689 family of PMICs designed for space-constrained applications. It combines power regulation with essential digital logic controls in a compact surface-mount package. The series targets designs where board area is limited but system reliability and fault protection are critical requirements.

Replacement Considerations

LT3689HMSE-5#PBF offers the same electrical characteristics but supports an extended operating temperature range up to +150°C.