LT3689IUD-5#PBF

Overview

The LT3689IUD-5#PBF is a monolithic synchronous step-down DC/DC converter manufactured by Analog Devices Inc. It features an integrated 700mA power switch and operates from a 3.4V to 38V input range. The device provides a fixed 5V output with adjustable voltage capability down to 800mV. Key electrical parameters include a 2MHz switching frequency, 50µA quiescent current, and operation over a -40°C to +125°C temperature range. It is housed in a 16-lead QFN package.

Feature Summary

• Integrates a 700mA synchronous power switch for compact design
• Includes built-in Power-On Reset generator and Watchdog Timer
• Supports wide input voltage range up to 38V

Applications

• Industrial control systems requiring robust power management
• Embedded computing platforms needing reliable reset supervision
• Automotive electronics operating within specified voltage limits

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free RoHS compliance when sourcing. Confirm that the '-5' designation corresponds to the fixed 5V output variant required for your circuit design. Ensure compatibility with the QFN-16 footprint during PCB layout verification.

Selection Notes

Select this component when a high-voltage buck regulator with integrated system monitoring is required. It is suitable for applications demanding low standby current and precise output regulation without external feedback resistors for the fixed version. Consider thermal performance given the QFN-16 package constraints.

Part Context

This part belongs to the LT3689 family of synchronous buck regulators. It distinguishes itself by combining power conversion with supervisory functions like reset and watchdog timers. The '-5' variant specifically sets the output voltage to 5V, simplifying design for standard logic levels compared to adjustable versions.

Replacement Considerations

Direct substitutes may include other Analog Devices buck regulators with integrated supervisors, such as the LTC3604 series, though pinout and feature sets must be verified. Cross-reference with similar high-voltage synchronous converters offering integrated reset functionality.