LTC3869EUFD#PBF

DC DC Switching Controllers Overview

The LTC3869EUFD#PBF is a dual-phase synchronous step-down switching regulator controller manufactured by Analog Devices Inc. It operates with an input voltage range of 4V to 24V and supports output voltages from 0.8V to 14V. The device delivers up to 25A of output current across two independent channels. It features a switchable frequency range between 75kHz and 850kHz, allowing for optimization of external component size and efficiency. The controller utilizes a constant frequency current mode architecture with phase-shifted operation to minimize input capacitor ripple current. It includes integrated power good indicators, independent soft-start ramps via TRACK/SS pins, and current foldback protection for short-circuit conditions.

DC DC Switching Controllers Feature Summary

• Dual-channel synchronous buck control with independent output regulation
• Phase-shifted operation to reduce input capacitor stress and noise
• Integrated OPTI-LOOP compensation for optimized transient response
• Current foldback protection limits MOSFET heat dissipation during faults

DC DC Switching Controllers Applications

• Distributed DC power systems in industrial equipment
• Battery-operated digital devices requiring high efficiency
• Automotive always-on systems
• Telecommunications infrastructure power supplies

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging when sourcing. Confirm the QFN-28 package dimensions match your PCB footprint requirements. Ensure the selected variant matches the required temperature grade for your operating environment. Cross-reference the manufacturer datasheet for any recent design changes or obsolescence notices before finalizing procurement plans.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring high current density and low input ripple. The adjustable switching frequency allows balancing between efficiency and passive component size. Consider the thermal performance of the QFN-28 package and ensure adequate copper area for the exposed pad. Verify that the external MOSFETs can handle the peak currents generated by the dual-phase architecture under worst-case load conditions.

DC DC Switching Controllers Part Context

This component belongs to the LTC3868/LTC3869 family of high-performance synchronous buck controllers. It shares architectural similarities with the LTC3868 but offers specific pinout and feature variations tailored for different board layout constraints. The EUFD suffix denotes the commercial temperature grade and QFN-28 package type. It serves as a core power management IC for multi-rail systems requiring precise voltage regulation.

DC DC Switching Controllers Replacement Considerations

• LTC3868EUFD-1#PBF

DC DC Switching Controllers FAQ

Does the LTC3869EUFD#PBF have an internal enable pin?

No, the standard LTC3869EUFD#PBF does not include an internal enable pin. External circuitry is required to control the startup and shutdown sequences using the TRACK/SS pins.

What is the typical no-load quiescent current?

The typical no-load quiescent current is 50µA, which helps extend battery life in portable applications.