LT3689HMSE#PBF

Overview

The LT3689HMSE#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., housed in a 16-lead MSOP package. It delivers an adjustable output voltage with a maximum continuous current of 700 mA. The device operates from an input voltage range of 3.4 V to 38 V, featuring a typical quiescent current of 125 µA and a shutdown supply current of 50 µA. The internal switch supports a programmable switching frequency between 350 kHz and 2.2 MHz. Integrated features include a power-on reset generator and a watchdog timer for system reliability.

Feature Summary

• Integrates a high-efficiency synchronous buck converter with a 700 mA output capability
• Includes built-in power-on reset circuitry and a watchdog timer for enhanced system monitoring
• Supports wide input voltage ranges suitable for various power supply architectures
• Features programmable switching frequency to optimize external component size and efficiency

Applications

• Industrial control systems requiring reliable power regulation
• Embedded computing platforms needing integrated reset and watchdog functions
• Battery-powered equipment utilizing wide input voltage ranges
• Automotive electronics operating within specified temperature extremes

Procurement Notes

Verify the specific suffix and package type against the official datasheet to ensure compatibility with design requirements. Confirm RoHS compliance status and manufacturing origin through authorized distributors. Check for any recent product change notices regarding material or packaging updates. Ensure availability aligns with project timelines as supply levels may vary. Validate that the selected variant matches the required electrical specifications for the target application.

Selection Notes

Select this component when a compact solution combining regulation, reset, and watchdog functions is required. Consider the 700 mA output limit and input voltage range against load demands. Evaluate the trade-off between switching frequency and external inductor/capacitor sizes. Verify thermal performance in the intended MSOP enclosure under expected load conditions. Compare against fixed-output variants if a specific voltage level is needed without external resistors.

Part Context

This part belongs to the LT3689 family of single-output buck regulators designed for space-constrained applications. It shares functional similarities with other ADI PMICs but distinguishes itself through the integration of safety timers. The MSOP-16 package offers a compact footprint compared to larger QFN or SOIC options. It serves as a complete power management solution for systems requiring minimal external components.

Replacement Considerations

LT3689HMSE-5#PBF is a confirmed substitute offering a fixed 5 V output instead of adjustable voltage while maintaining similar electrical characteristics and package form factor.