LT3680IDD#PBF

Overview

The LT3680IDD#PBF is a monolithic synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.6V to 36V and delivers up to 3.5A of output current. The device features an adjustable switching frequency from 230kHz to 2.45MHz, allowing for optimization between efficiency and external component size. It incorporates a low quiescent current of 75µA and supports output voltages adjustable from 0.79V to 30V. Packaged in a compact 10-lead WDFN (3x3mm) with exposed pad, it is designed for high-efficiency power conversion in space-constrained applications.

Feature Summary

• Integrates a 36V, 3.5A synchronous switch pair for efficient step-down regulation
• Features adjustable switching frequency to optimize performance versus component size
• Includes internal soft-start to limit inrush current during startup
• Provides cycle-by-cycle current limiting and thermal shutdown protection

Applications

• Point-of-load regulation for industrial equipment
• Power supplies for embedded systems and networking gear
• Battery-powered instrumentation requiring high efficiency
• Telecommunications infrastructure power distribution

Procurement Notes

Verify the specific suffix IDD against the official datasheet to confirm the temperature grade and package variant. Ensure compatibility with your PCB footprint for the 10-WFDFN exposed pad configuration. Cross-reference the manufacturer part number LT3680IDD#PBF with authorized distributors to confirm current availability and authenticity before finalizing procurement plans.

Selection Notes

Select this component when a wide input voltage range up to 36V is required alongside moderate output currents near 3.5A. The adjustable frequency feature allows designers to shift noise away from sensitive bands or minimize inductor size. Consider the thermal performance of the exposed pad design for heat dissipation requirements in enclosed environments compared to higher current alternatives.

Part Context

This part belongs to the LT3680 family of synchronous buck regulators. It shares architectural similarities with other Analog Devices PMICs but is distinct in its specific 36V input rating and 3.5A current capability. The IDD suffix typically denotes a specific industrial temperature range and package option within the broader LT3680 product line.

Replacement Considerations

LT3680EDD#PBF: Verified alternative within the same family offering identical electrical specifications and functionality.