LT3689HMSE-5#TRPBF

Overview

The LT3689HMSE-5#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc., housed in a 16-lead MSOP package. It provides a fixed 5 V output with a maximum current capability of 700 mA. The device operates from an input voltage range of 3.4 V to 38 V and features a low quiescent current of 50 uA. It integrates a power-on reset generator and a watchdog timer for system protection. The internal switch operates at a frequency of 2 MHz, supporting compact designs within an operating temperature range of -40°C to +150°C.

Feature Summary

• Integrates a power-on reset circuit and a watchdog timer for enhanced system reliability and fault monitoring.
• Supports high input voltages up to 38 V, suitable for industrial and automotive bus architectures.
• Features a wide operating junction temperature range extending to +150°C for harsh environment applications.

Applications

• Industrial control systems requiring robust power management
• Automotive electronics with high-voltage bus inputs
• Embedded systems needing integrated fault protection

Procurement Notes

Verify the complete part number including suffixes such as #TRPBF against official Analog Devices documentation to ensure correct packaging and lead-free status. Confirm that the specific MSOP-16 variant matches your PCB footprint requirements. Cross-reference the datasheet revision date to ensure compatibility with your design specifications and regulatory compliance needs.

Selection Notes

Select this component when a fixed 5 V output is required alongside integrated system supervision functions. The 700 mA output current suits moderate load applications. Consider the 2 MHz switching frequency for balancing efficiency and external component size. Ensure the input voltage remains within the 3.4 V to 38 V range for proper regulation.

Part Context

This part belongs to the LT3689 family of micropower synchronous buck regulators. It is designed for applications requiring small solution size and high efficiency. The device combines power stage, controller, and protection logic in a single package. It is distinct from linear regulators due to its switching topology and higher input voltage tolerance.

Replacement Considerations

Check Analog Devices documentation for direct pin-compatible alternatives within the LT3689 series. Verify if other variants offer different output voltages or current ratings while maintaining the same package and functionality. Ensure any substitute supports the required 38 V input and 150°C temperature rating.