LM74900QRGERQ1

Overview

The LM74900QRGERQ1 is an automotive-grade N+1 ORing controller designed for redundant power supply applications. It utilizes external N-channel MOSFETs to implement ideal diode functionality with a 1:1 input-to-output ratio. The device operates within a supply voltage range of 3V to 65V and supports a maximum output current of 2.6A. It features a low supply current of 635 µA and functions reliably across an operating temperature range of -40°C to 125°C. The component is housed in a 24-VQFN (4x4) package with wettable flanks for enhanced solderability.

Feature Summary

• Provides N+1 redundancy control for high-availability power systems
• Enables ideal diode behavior using external N-channel FETs
• Supports wide input voltage ranges up to 65V
• Features AEC-Q100 qualification for automotive reliability

Applications

• Redundant power supply architectures
• High-availability automotive electronic systems
• N+1 power distribution networks

Procurement Notes

Verify the specific ordering suffix matches the required tape-and-reel or cut-tape configuration. Confirm that the 24-VQFN package variant aligns with the target PCB footprint design. Ensure the automotive grade specification meets the project's environmental and reliability standards before finalizing procurement orders.

Selection Notes

Select this controller when designing redundant power paths requiring low forward voltage drop without integrated switches. Consider the external N-channel FET selection carefully to ensure it supports the required current and voltage levels. Evaluate the thermal performance of the external components alongside the controller's 635 µA quiescent current for efficiency optimization.

Part Context

This component belongs to the LM749xx-Q1 family of ideal diode controllers from Texas Instruments. It shares the same functional architecture and package style as related models like the LM74910QRGERQ1, differing primarily in specific internal parameter tuning. The family targets robust power management solutions for demanding automotive environments.

Replacement Considerations

LM74910QRGERQ1 is a confirmed substitute within the same product family offering identical packaging and core functionality.