LT3689IUD#TRPBF

Overview

The LT3689IUD#TRPBF 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 delivers up to 700 mA of output current. The device supports adjustable output voltages from 800 mV to 34.2 V and features a fixed 2 MHz switching frequency. Quiescent current is specified at 50 uA, ensuring efficient operation in low-power states. It includes integrated power-on reset and watchdog timer functions for system reliability. The component is housed in a QFN-16 package and is rated for operation between -40°C and +125°C.

Feature Summary

• Integrates power-on reset generator and watchdog timer for enhanced system monitoring
• Synchronous buck topology ensures high efficiency across the load range
• Fixed 2 MHz switching frequency allows for compact external component sizing

Applications

• Portable battery-powered equipment requiring low quiescent current
• Industrial control systems needing robust reset and watchdog protection
• Embedded applications utilizing wide input voltage ranges

Procurement Notes

Verify the specific suffix against official documentation to confirm tape-and-reel packaging versus tube configuration. Confirm RoHS compliance status through the manufacturer's declaration. Ensure the operating temperature grade matches the intended environmental conditions. Cross-reference the part number with the latest datasheet revision to validate pinout and electrical characteristics before integration.

Selection Notes

Select this component when a single-output buck converter with integrated safety features is required. The 700 mA limit suits moderate load applications where space constraints favor a 2 MHz frequency. Consider the 38 V maximum input rating for compatibility with standard industrial bus voltages. Evaluate thermal performance within the QFN-16 package for the expected ambient conditions.

Part Context

This part belongs to the LT3689 series of monolithic switching regulators designed for high-efficiency power conversion. It combines a synchronous buck controller with essential system management functions. The series targets applications demanding reliable startup sequencing and fault detection without external discrete components.

Replacement Considerations

LT3689IUD#PBF is a verified equivalent offering identical electrical specifications but differs in packaging format.