LT3689HMSE#PBF

Overview

The LT3689HMSE#PBF is a monolithic buck switching regulator manufactured by Analog Devices. It features an integrated power switch capable of delivering up to 700mA output current. The device accepts input voltages ranging from 3.4V to 38V and supports adjustable output voltages. Key electrical parameters include a quiescent current of 125µA, a shutdown supply current of 50µA, and a programmable switching frequency between 350kHz and 2.2MHz. It operates within a temperature range of -40°C to +150°C and is housed in a 16-lead MSOP package.

Feature Summary

• Integrates a high-efficiency synchronous buck converter with internal power switches.
• Includes built-in Power-On Reset generator and watchdog timer for system protection.
• Supports wide input voltage range suitable for various power sources.
• Features adjustable switching frequency to optimize performance for specific applications.

Applications

• Industrial control systems requiring robust power management
• Automotive electronics operating under wide temperature conditions
• Portable equipment powered by single-cell lithium-ion batteries
• General-purpose step-down regulation in embedded systems

Procurement Notes

Verify the exact part number suffix against official Analog Devices documentation to ensure correct package type and temperature grade. Confirm RoHS compliance status through the manufacturer's latest material declaration. Cross-reference the datasheet revision date to validate parameter accuracy before integration into design specifications.

Selection Notes

Select this component when a compact solution is needed for step-down conversion with integrated system monitoring functions. Consider the 700mA current limit and 38V maximum input voltage constraints. Evaluate the thermal performance requirements given the MSOP-16 package size and the specified junction temperature range for reliable operation.

Part Context

This part belongs to the LT3689 family of switching regulators designed for space-constrained applications. It combines power management with digital supervision features, distinguishing it from basic buck converters. The HMSE designation indicates the specific lead frame and package configuration used for surface-mount assembly.

Replacement Considerations

Consult Analog Devices documentation for direct pin-compatible alternatives within the same series. Verify that substitute parts maintain identical watchdog and reset functionality if these features are critical to the application design.