LT3688EUF#PBF

Overview

The LT3688EUF#PBF is a dual-channel synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.8 V to 36 V and withstands transients up to 60 V. Each channel provides an adjustable output voltage from 0.8 V to 32.4 V with a maximum output current of 800 mA. The device features a fixed internal switching frequency of 2.2 MHz and a typical quiescent current of 65 µA. It integrates two power-on reset timers and a watchdog timer for system protection. The component is housed in a 24-lead QFN package and supports operation temperatures from -40°C to +125°C.

Feature Summary

• Dual independent buck channels providing separate adjustable outputs
• Integrated power-on reset generators and watchdog timer functionality
• High input voltage tolerance capable of handling 60V transients
• Fixed high-frequency switching for reduced external component size

Applications

• Industrial control systems requiring isolated or multi-rail power distribution
• Portable instrumentation powered by single-cell lithium batteries
• Automotive electronics operating within wide input voltage ranges
• Embedded systems utilizing microcontrollers needing precise voltage regulation

Procurement Notes

Verify the specific suffix and tape/reel versus tube packaging options available through authorized distributors. Confirm RoHS compliance status and lead times directly with Analog Devices or certified partners. Ensure the ordering information matches the exact thermal pad requirements for the QFN-24 package during assembly planning.

Selection Notes

Select this component when dual low-current buck converters are required within a compact footprint. The fixed 2.2 MHz frequency minimizes inductor size compared to lower frequency alternatives. Verify that the total thermal dissipation remains within limits for the chosen PCB layout and ambient temperature conditions.

Part Context

This part belongs to the LT3688 family of dual synchronous buck regulators designed for space-constrained applications. It shares architectural similarities with other high-voltage buck controllers but distinguishes itself through integrated timing protection features. The device targets markets demanding reliable power management without complex external logic.

Replacement Considerations

Consult official Analog Devices documentation for qualified pin-to-pin replacements. Cross-reference specifications such as input voltage range, output current capability, and package dimensions before substitution.