LTC4353IDE#PBF

OR Controllers, Ideal Diodes Overview

The LTC4353IDE#PBF is a dual low voltage ideal diode controller manufactured by Analog Devices Inc. It controls external N-channel MOSFETs to implement an ideal diode function, replacing high-power Schottky diodes and associated heat sinks. The device supports supply oring and holdup applications with supplies ranging from 2.9V to 18V. It features fast turn-on and turn-off times of approximately 1µs to minimize load voltage droop and reverse-current transients. The component is housed in a 16-lead MSOP package or a 4mm × 3mm DFN package.

OR Controllers, Ideal Diodes Feature Summary

• Controls external N-channel MOSFETs to replace power diodes for low-loss current path implementation
• Regulates forward-voltage drop across the MOSFET to ensure smooth current transfer during diode-or operations
• Provides fast switching response to reduce load voltage droop during supply switchover events
• Includes enable inputs for low current state management and on-status outputs for monitoring

OR Controllers, Ideal Diodes Applications

• Redundant power supply systems
• Supply holdup circuits
• High availability systems and servers
• Telecom and network infrastructure

OR Controllers, Ideal Diodes Procurement Notes

Verify the specific suffix and package variant against the official datasheet before procurement. Confirm that the selected component matches the required operating temperature range and voltage specifications for the target application. Ensure compatibility with external N-channel MOSFET selection based on gate drive requirements. Check for any recent manufacturing changes or obsolescence notices from the manufacturer.

OR Controllers, Ideal Diodes Selection Notes

Select this controller when designing redundant power architectures requiring low forward voltage drop without the thermal penalties of Schottky diodes. It is suitable for systems operating between 2.9V and 18V where fast switchover times are critical. Consider the external MOSFET Rds(on) and gate charge characteristics to optimize performance. This component is appropriate for space-constrained designs utilizing MSOP or DFN packages.

OR Controllers, Ideal Diodes Part Context

The LTC4353 belongs to the Linear Technology (now Analog Devices) family of ideal diode controllers. It is designed specifically for dual-channel applications, allowing independent control of two external N-channel MOSFETs. This distinguishes it from single-channel solutions and enables efficient power oring in multi-source environments common in industrial and telecom equipment.

OR Controllers, Ideal Diodes Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation.