LTC4418IUF#PBF

OR Controllers, Ideal Diodes Overview

The LTC4418IUF#PBF is a dual-channel prioritized PowerPath controller manufactured by Analog Devices Inc. It connects one of two valid power sources to a common output based on defined priority, with V1 designated as higher priority than V2. The device operates within an input voltage range of 2.5V to 40V and withstands reverse voltages up to 42V. It utilizes external FETs and features a low static current of 26µA. The component supports adjustable input validation times and includes overvoltage/undervoltage protection with configurable hysteresis. Packaged in a 20-lead 4mm × 4mm QFN with an exposed pad, it functions across a temperature range of -40°C to +85°C.

OR Controllers, Ideal Diodes Feature Summary

• Selects the highest priority valid power source from two inputs for connection to a common output
• Prevents reverse and cross-conduction currents using integrated fast non-overlapping switch circuitry
• Provides high-voltage tolerance with inputs capable of withstanding 60V and reverse protection up to 42V
• Offers adjustable input validation time and overvoltage/undervoltage protection with configurable hysteresis

OR Controllers, Ideal Diodes Applications

• Industrial handheld instruments requiring redundant power supplies
• High availability systems needing automatic power path switching
• Battery backup systems ensuring seamless transition between primary and secondary power sources
• Servers and computer peripherals managing multiple power inputs

OR Controllers, Ideal Diodes Procurement Notes

Verify the exact part number suffix against official Analog Devices documentation to confirm package type and tape/reel specifications. Ensure compatibility with external MOSFET gate drive requirements, noting the integrated 6V clamp. Confirm thermal performance expectations for the QFN-20-EP package under specific load conditions. Validate that the application voltage remains within the 2.5V to 40V operating range. Check for any specific ordering restrictions or lifecycle status updates directly from the manufacturer.

OR Controllers, Ideal Diodes Selection Notes

Choose this controller when designing systems requiring deterministic power source selection based on hardware-defined priorities rather than simple OR-ing. It is suitable for applications demanding low quiescent current and robust protection against invalid power inputs. Consider the need for external FETs and the benefit of adjustable validation timers to prevent nuisance switching during transient events. Evaluate the 20-pin QFN footprint against available PCB real estate and thermal dissipation capabilities.

OR Controllers, Ideal Diodes Part Context

The LTC4418 belongs to Analog Devices' family of ideal diode and ORing controllers. It is designed to manage power paths efficiently while minimizing voltage drop compared to traditional diode solutions. The device integrates control logic for external N-channel MOSFETs, allowing for precise management of power flow direction and source validity monitoring in complex multi-source power architectures.

OR Controllers, Ideal Diodes Replacement Considerations

Public confirmed substitute part numbers are not provided in the reference data.