LTC4421CUHE#TRPBF

OR Controllers, Ideal Diodes Overview

The LTC4421CUHE#TRPBF is a high-power prioritized PowerPath controller manufactured by Analog Devices Inc. It operates within a supply voltage range of 2.7 V to 36 V and features an adjustable current limit for precise power management. The device is designed for single-channel applications, drawing a typical operating supply current of 530 µA. It supports an extended industrial temperature range from -40°C to +85°C and is housed in a compact 36-lead QFN package measuring 5mm x 6mm with a height of 0.75mm including the exposed pad.

OR Controllers, Ideal Diodes Feature Summary

• Drives external N-Channel MOSFETs to connect one of two input supplies to a common output based on user-defined priority
• Provides hardware-based prioritization logic to ensure critical power sources are selected automatically
• Integrates adjustable current limiting capabilities to protect downstream loads from overcurrent conditions

OR Controllers, Ideal Diodes Applications

• Server and storage systems requiring redundant power inputs
• Industrial control equipment needing reliable power path switching
• Telecommunications infrastructure with dual power source requirements

OR Controllers, Ideal Diodes Procurement Notes

Verify the specific suffix TRPBF indicates tape-and-reel packaging when ordering. Confirm that the CUHE designation corresponds to the industrial temperature grade and QFN package variant. Ensure compatibility with external N-Channel MOSFET selection for the intended load current. Check manufacturer documentation for any recent product change notifications affecting pinout or electrical characteristics.

OR Controllers, Ideal Diodes Selection Notes

Select this component when a hardware-prioritized solution is required for dual-input power architectures. The integrated control logic simplifies design compared to discrete comparator-based approaches. Consider the 36-lead QFN footprint for board space constraints. Verify that the external MOSFET Rds(on) meets efficiency targets given the controller's drive capabilities.

OR Controllers, Ideal Diodes Part Context

This part belongs to the LTC4421 family of prioritized PowerPath controllers. It complements other Analog Devices power management ICs like the LTC4420 and LTC4417. The series focuses on robust power distribution without microcontroller intervention. It serves as a key component in fail-safe power routing designs.

OR Controllers, Ideal Diodes FAQ

Does the LTC4421CUHE#TRPBF include an internal switch?

No, the device does not contain an internal switch. It is designed to drive external N-Channel MOSFETs to handle the power path switching.

What is the delay time for turning on the external MOSFET?

The typical delay time for turning on (ON delay) is 1.3 µs, while the turn-off (OFF delay) is typically 1.4 µs.